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Source of optical gain in a laser
The active laser medium (also called a gain medium or lasing medium) is the source of optical gain within a laser. The gain results from the stimulated
Active_laser_medium
Laser using an optical fiber as the active gain medium
A fiber laser (or fibre laser in Commonwealth English) is a laser in which the active gain medium is an optical fiber doped with rare-earth elements such
Fiber_laser
Device that emits light via optical amplification
lasers use quantum dots as the active laser medium. These lasers exhibit device performance that is closer to gas lasers and avoid some of the disadvantages
Laser
Laser which uses a solid gain medium
generally excluded, treated as a separate class of laser. Generally, the active medium of a solid-state laser consists of a glass or crystalline "host" material
Solid-state_laser
Solid-state laser
linewidth of 0.53 nm. The ruby laser is a three-level solid state laser. The active laser medium (laser gain/amplification medium) is a synthetic ruby rod that
Ruby_laser
Synthetic crystalline material
first working Nd:YAG laser was invented in 1964. Neodymium-YAG is the most widely used active laser medium in solid-state lasers, being used for everything
Yttrium_aluminium_garnet
Semiconductor laser that uses quantum dots as the active laser medium
A quantum dot laser is a semiconductor laser that uses quantum dots as the active medium for stimulated emission of light. Due to quantum confinement of
Quantum_dot_laser
Form of gas laser
CO2 laser produces a beam of infrared light with the principal wavelength bands centering on 9.6 and 10.6 micrometers (μm). The active laser medium (laser
Carbon-dioxide_laser
Spectral linewidth of a laser beam
geometrical length ℓ {\displaystyle \ell } , homogeneously filled with an active laser medium of refractive index n {\displaystyle n} . We define the reference
Laser_linewidth
Solid-state laser
An Er:YAG laser (erbium-doped yttrium aluminium garnet laser, erbium YAG laser) is a solid-state laser whose active laser medium is erbium-doped yttrium
Er:YAG_laser
Instrument to measure angular velocity
to Ring laser gyroscopes. Accelerometer Active laser medium Hemispherical resonator gyroscope Laser construction Laser science List of laser applications
Ring_laser_gyroscope
Topics referred to by the same term
substance which can propagate waves or energy Active laser medium (also called gain medium or lasing medium), a quantum system that allows amplification
Medium
Laser system designed by the United States and Israel for use in military operations
Chemical laser Laser science Active laser medium Laser applications Laser construction List of lasers Deuterium fluoride laser List of laser articles
Tactical_High_Energy_Laser
Laser which emits light with blue wavelengths
not produce blue lasers. Blue, direct diode semiconductor lasers can be built using inorganic gallium nitride (GaN) or InGaN gain medium, upon which many
Blue_laser
Type of gas laser
ion laser is a gas laser that uses an ionized gas as its lasing medium. Like other gas lasers, ion lasers feature a sealed cavity containing the laser medium
Ion_laser
An Er:glass laser (erbium-doped glass laser) is a solid-state laser whose active laser medium is erbium-doped glass. Ytterbium (Yb) is sometimes added
Er:glass_laser
Devices and processes that produce light
Quantum dot laser – Semiconductor laser that uses quantum dots as the active laser medium Quantum well laser – Laser diode in which the active region is
List_of_light_sources
Use of light to raise electrons to higher energy states
molecule to a higher one. It is commonly used in laser construction to pump the active laser medium so as to achieve population inversion. The technique
Optical_pumping
Chemical compound
orthovanadate: Doped with neodymium it forms Nd:YVO4, an active laser medium used in diode-pumped solid-state lasers. Doped with europium it forms Eu:YVO4, the dominant
Yttrium_orthovanadate
are realized on opposite sides of a thin layer of active gain medium. Despite their name, disk lasers do not have to be circular; other shapes have also
Disk_laser
Topics referred to by the same term
Laser crystal may refer to: a type of active laser medium, the source of optical gain within a laser Bubblegram, a solid block of glass or transparent
Laser_crystal
Laser in which electricity is discharged through gas
A gas laser is a laser in which an electric current is discharged through a gas to produce coherent light. The gas laser was the first continuous-light
Gas_laser
Laser gain medium
yttrium orthovanadate. It is commonly used as an active laser medium for diode-pumped solid-state lasers. It comes as a transparent blue-tinted material
Neodymium-doped yttrium orthovanadate
Neodymium-doped_yttrium_orthovanadate
Type of laser
increase the efficiency of energy transfer from the heating laser pulse into the active medium (plasma), a sheared excitation pulse is sometimes employed
X-ray_laser
Substance added to material to alter its properties
transparent crystals, ceramics, or glasses is used to produce the active medium for solid-state lasers. It is in the electrons of the dopant atoms that a population
Dopant
Device that emites acoustic radiation
SASER design we need to imagine it in analogy with a laser device. In a laser, the active medium is placed between two mirror surfaces (reflectors)of
Sound amplification by stimulated emission of radiation
Sound_amplification_by_stimulated_emission_of_radiation
Use of laser beams to remove material from a workpiece
used as an active laser medium. YAG is an abbreviation for yttrium aluminum garnet which are crystals that are used for solid-state lasers while Nd:YAG
Laser_beam_machining
Ability of a circuit to increase the power or amplitude of a signal
level and impedance is also known as unity gain. Active laser medium Antenna gain Aperture-to-medium coupling loss Automatic gain control Attenuation
Gain_(electronics)
Type of light that can be emitted by an optical amplifier
stimulated emission in a gain medium. It is inherent in the field of random lasers. ASE is produced when a laser gain medium is pumped to produce a population
Amplified spontaneous emission
Amplified_spontaneous_emission
Type of laser
active laser medium. The lasing medium is usually a dye doped into the liquid crystal. Liquid-crystal lasers are comparable in size to diode lasers, but provide
Liquid-crystal_laser
In laser physics, gain or amplification is a process where the medium transfers part of its energy to the emitted electromagnetic radiation, resulting
Gain_(laser)
Part of an optical resonator which allows intracavity light to be emitted
have an active laser medium between them. The medium amplifies the light by stimulated emission. For lasing to occur, the gain of the active medium must
Output_coupler
Acousto-optics Active laser medium Active optics Advanced Precision Kill Weapon System Advanced Tactical Laser Afocal system Airborne laser Airborne wind
List_of_laser_articles
Chemical compound
and when doped with praseodymium or neodymium it can act as a good active laser medium. Sr0.95Ce0.05Mg0.05Al11.95O19 is a phosphor emitting at 305 nm, with
Strontium_aluminate
Chemical compound
for garnet crystals in lasers Optical fibers Additive for special alloys and dielectric ceramic materials Active laser medium R. Robie, B. Hemingway,
Ytterbium(III)_oxide
Active laser medium
Ytterbium-doped lutetium orthovanadate, typically abbreviated Yb:LuVO4, is an active laser medium. The peak absorption cross section for the pi-polarization is 8.42×10−20 cm2
Ytterbium-doped lutetium orthovanadate
Ytterbium-doped_lutetium_orthovanadate
Release of a photon triggered by another
I(z)=I_{in}+{\gamma _{0}(\nu )\cdot z \over {\bar {g}}(\nu )}I_{S}} Active laser medium Laser science Rabi cycle Stimulated emission depletion microscopy Hecht
Stimulated_emission
Laser pulsing technique
variable attenuator inside the laser's optical resonator. When the attenuator is functioning, light which leaves the gain medium does not return, and lasing
Q-switching
Equipment using an organic dye to emit coherent light
A dye laser is a laser that uses an organic dye as the lasing medium, usually as a liquid solution. Compared to gases and most solid state lasing media
Dye_laser
Laser using electron beam in vacuum as gain medium
free-electron laser (FEL) is a fourth generation light source producing extremely brilliant and short pulses of radiation. An FEL functions much as a laser but
Free-electron_laser
Way to produce very short laser bursts
or range of frequencies. A laser's bandwidth of operation is determined primarily by the gain medium from which the laser is constructed, and the range
Mode_locking
Laser system developed by Lawrence Livermore National Laboratory
100 J with a 10% efficient conversion of electricity to laser light. The active gain medium is Yb:SFAP (Ytterbium-doped strontium fluorapatite, Sr5(PO4)3F)
Mercury_laser
Arrangement of mirrors
Optical cavities are a major component of lasers, surrounding the gain medium and providing feedback of the laser light. They are also used in optical parametric
Optical_cavity
Process of hair removal by exposure to laser pulses
Laser hair removal is the process of hair removal by means of exposure to pulses of laser light that destroy the hair follicle. It had been performed
Laser_hair_removal
Directed-energy weapon using lasers
A laser weapon is a type of directed-energy weapon (DEW) that uses lasers to inflict damage. Laser weapons are of two types: low-power laser dazzlers that
Laser_weapon
Chemical element with atomic number 69 (Tm)
triple-doped yttrium aluminium garnet (Ho:Cr:Tm:YAG, or Ho,Cr,Tm:YAG) is an active laser medium material with high efficiency. It lases at 2080 nm in the infrared
Thulium
Recording to reproduce a three-dimensional light field
interference pattern which a plate, film, or other medium photographically records. In one common arrangement, the laser beam is split into two, one known as the
Holography
Nontraditional laser theory of Fabry-Perot semiconductor lasers
Poynting vector; V=sz, 0 <z<L, where s is cross section (to axis z) of active laser medium. Equations for energy flux follow from (4): ( 5 ) d I + d z = ( Γ
Nonlinear theory of semiconductor lasers
Nonlinear_theory_of_semiconductor_lasers
Technology that uses a laser to cut materials
Laser cutting is a technology that uses a laser to vaporize materials, resulting in a cut edge. While typically used for industrial manufacturing applications
Laser_cutting
Semiconductor laser
A laser diode (LD, also injection laser diode or ILD or semiconductor laser or diode laser) is a semiconductor device similar to a light-emitting diode
Laser_diode
Acousto-optic deflector Acousto-optic filter Acousto-optic modulator Active laser medium Afterglow Airglow Airy disk Albedo Alexander's band Alpenglow Angle
Index_of_optics_articles
Welding technique
gas lasers can be much higher than solid-state lasers, reaching 25 kW. In fiber lasers, a doped optical fiber serves as the gain medium in which laser light
Laser_beam_welding
American physicist (1927–2007)
Union Carbide as the active laser medium and a helical xenon flash lamp as the excitation source. As Townes later wrote, "Maiman's laser had several aspects
Theodore_Maiman
Dye used as a laser medium
A Laser dye is a dye used as laser medium in a dye laser. Laser dyes include the coumarins and the rhodamines. Coumarin dyes emit in the green region
Laser_dye
Process that removes material from an object by heating it with a laser
irradiating it with a laser beam. At low laser flux, the material is heated by the absorbed laser energy and evaporates or sublimates. At high laser flux, the material
Laser_ablation
When a system has more excited-state members than ground-state
it is useful to consider a very simple assembly of atoms forming a laser medium. Assume there is a group of N atoms, each of which is capable of being
Population_inversion
(Nd:YCa4O(BO3)3) is a nonlinear optical crystal, which is commonly used as an active laser medium. It can be grown from a melt by the Czochralski technique. It belongs
Nd:YCOB
Laser diode in which the active region is so narrow that quantum confinement occurs
A quantum-well laser is a laser diode in which the active region of the device is so narrow that quantum confinement occurs. Laser diodes are formed in
Quantum_well_laser
Laser whose optical feedback occurs from scattering
laser science, a random laser (RL) is a laser in which optical feedback is provided by scattering particles. As in conventional lasers, a gain medium
Random_laser
Optical instrument
Quantum-cascade lasers (QCLs) are semiconductor lasers that emit in the mid- to far-infrared portion of the electromagnetic spectrum and were first demonstrated
Quantum-cascade_laser
Gun-launched anti-tank missile
a laser-guided 120 mm anti-tank round that uses semi-active laser guidance to engage stationary or moving targets. The missile follows a coded laser beam
TANOK
Treatment using irradiation with light of low power intensity
Low-level laser therapy (LLLT), cold laser therapy or photobiomodulation (PBM) is a photochemical reaction-based medical treatment that applies low-level
Low-level_laser_therapy
scientific, military, medical and commercial laser applications have been developed since the invention of the laser in 1958. The coherency, high monochromaticity
List_of_laser_applications
Recreational shooting sport and game
Laser tag is a recreational shooting sport where participants use infrared-emitting light guns to tag designated targets. Infrared-sensitive signaling
Laser_tag
Handheld device that emits a laser beam
A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i
Laser_pointer
Laser capable of delivering picosecond (10^-12 s) pulses of light
An ultrashort pulse laser is a laser that emits ultrashort pulses of light, generally of the order of femtoseconds to one picosecond. They are also known
Ultrashort_pulse_laser
Engraving objects using lasers
Laser engraving is the practice of using lasers to engrave an object. The engraving process renders a design by physically cutting into the object to
Laser_engraving
Skin treatment
the skin intact. Laser resurfacing can be performed using non-ablative lasers, such as the 1540 nm Er:glass laser, or ablative lasers, such as the 2940 nm
Photorejuvenation
Type of laser
solid-state laser (DPSSL) is a solid-state laser made by pumping a solid gain medium, for example, a ruby or a neodymium-doped YAG crystal, with a laser diode
Diode-pumped solid-state laser
Diode-pumped_solid-state_laser
Chemical compound
crystal structure doped with rare-earth ions, it can be also used as active laser medium. It is highly transparent in the visible and infrared regions and
Caesium_cadmium_bromide
Laser that obtains energy from chemical reactions
A chemical laser is a laser that obtains its energy from a chemical reaction. Chemical lasers can reach continuous wave output with power reaching to megawatt
Chemical_laser
Diamond-like object which is not a diamond
were first conceived for intended use in high technology, such as active laser mediums, varistors, and bubble memory. Due to their limited present supply
Diamond_simulant
This is a list of laser types, their operational wavelengths, and their applications. Thousands of kinds of laser are known, but most of them are used
List_of_laser_types
Application of laser in medical field
Laser medicine is the use of lasers in medical diagnosis, treatments, or therapies, such as laser photodynamic therapy, photorejuvenation, and laser surgery
Laser_medicine
Type of ultraviolet laser important in chip manufacturing and eye surgery
An excimer laser, sometimes more correctly called an exciplex laser, is a form of ultraviolet laser which is commonly used in the production of microelectronic
Excimer_laser
Military warning system
screen (e.g. Shtora), active laser self-defence weapon with laser dazzler (LSDW, used on the Chinese Type 99 main battle tank), laser jammer, etc. Detectors
Laser_warning_receiver
Special glass type used for optical systems
glasses are used as active laser medium. Gradient-index lenses exploit the special properties of light propagation in a variable-index medium. In 1854, James
Optical_glass
Monochrome light beam whose amplitude envelope is a Gaussian function
(or TEM00) transverse Gaussian mode describes the intended output of many lasers, as such a beam diverges less and can be focused better than any other.
Gaussian_beam
Scientific instruments
gradient force trap) are scientific instruments that use a highly focused laser beam to hold and move microscopic and sub-microscopic objects like atoms
Optical_tweezers
Measurement device
A laser beam profiler captures, displays, and records the spatial intensity profile of a laser beam at a particular plane transverse to the beam propagation
Laser_beam_profiler
Optical analog video disc format
LaserDisc (LD) is a home video format and the first commercial optical disc storage medium. It was developed by Philips, Pioneer, and the movie studio
LaserDisc
Device for producing coherent EM waves in the sub-visible spectrum
molecule used as the masing medium (similar to what occurs in the lasing medium in a laser). By putting such an amplifying medium in a resonant cavity, feedback
Maser
3D printing technique
Selective laser sintering (SLS) is an additive manufacturing (AM) technique that uses a laser as the power and heat source to sinter powdered material
Selective_laser_sintering
Laser gain medium
typically abbreviated as Nd:GdVO4, is one of the active laser medium for diode laser-pumped solid-state lasers. Several advantages over Nd:YAG crystals include
Neodymium-doped gadolinium orthovanadate
Neodymium-doped_gadolinium_orthovanadate
Electrostatic digital printing process
Laser printing is an electrostatic digital printing process. It produces high-quality text and graphics (and moderate-quality photographs) by repeatedly
Laser_printing
Type of atomic emission spectroscopy
Laser-induced breakdown spectroscopy (LIBS) is a type of atomic emission spectroscopy which uses a highly energetic laser pulse as the excitation source
Laser-induced breakdown spectroscopy
Laser-induced_breakdown_spectroscopy
analysis Activation product Active and passive transformation Active cavity radiometer Active galactic nucleus Active laser medium AdS/CFT correspondence AdS/QCD
Index_of_physics_articles_(A)
3D printing technique
Selective laser melting (SLM) is one of many proprietary names for a metal additive manufacturing (AM) technology that uses a bed of powder with a source
Selective_laser_melting
Device that amplifies an optical signal
any laser active gain medium can be pumped to produce gain for light at the wavelength of a laser made with the same material as its gain medium. Such
Optical_amplifier
Technique for measuring chemical composition of a gas
optically accessible absorbing medium, receiving optics and detector/s. The emission wavelength of the tunable diode laser, viz. VCSEL, DFB, etc., is tuned
Tunable diode laser absorption spectroscopy
Tunable_diode_laser_absorption_spectroscopy
Method of spatial measurement using laser
or laser imaging, detection, and ranging, often stylized LiDAR) is a method for determining ranges by targeting an object or a surface with a laser and
Lidar
Short-to-medium range air-to-ground missile
use in practice. The updated AS-30L replaced this system with a semi-active laser homing system, which allows the missile to fly to the target without
AS-30
Spectroscopic technique
usually from a laser in the visible, near infrared, or near ultraviolet range is used, although X-rays can also be used. The laser light interacts with
Raman_spectroscopy
Medical use of laser to cut tissues
Laser surgery is a type of surgery that cuts tissue using a laser in contrast to using a scalpel. Soft-tissue laser surgery is used in a variety of applications
Laser_surgery
Excimer laser
advantage of gas-based lasers are that with no solid medium, the hardware inside the beamline does not heat up. This allows excimer lasers to fire at high repetition
Nike_laser
Measure of laser beam quality
average power at the same time due to thermal lensing in the laser gain medium. Real laser beams are often non-Gaussian, being multi-mode or mixed-mode
M_squared
Optical imaging technique
Confocal laser scanning microscopes use multiple mirrors (typically 2 or 3 scanning linearly along the x- and the y- axes) to scan the laser across the
Confocal_microscopy
Form of beam-powered propulsion
that in an active optical cavity formed by two high-reflectance mirrors and a laser gain medium in between, similar to the typical laser cavity, photon
Laser_propulsion
Laser with a dye-doped organic matrix
A solid-state dye laser (SSDL) is a solid-state lasers in which the gain medium is a laser dye-doped organic matrix such as poly(methyl methacrylate) (PMMA)
Solid-state_dye_laser
Surface engineering process
Laser peening (LP), or laser shock peening (LSP), is a surface engineering process used to impart beneficial residual stresses in materials. The deep,
Laser_peening
ACTIVE LASER-MEDIUM
ACTIVE LASER-MEDIUM
Surname or Lastname
English (Sussex)
English (Sussex) : unexplained.Americanized form of German Löscher (see Loescher).Jewish (eastern Ashkenazic) : habitational name for someone from the village of Lasha, now in Belarus.
Boy/Male
Indian
Lives forever
Girl/Female
Arabic, Muslim
Wealth
Surname or Lastname
English (Sussex and Kent)
English (Sussex and Kent) : topographic name for someone who lived by a stream, from Old English lacu ‘stream’ (see Lake) + the suffix -er denoting an inhabitant.
Girl/Female
Hindu, Indian
Wave; Flow
Boy/Male
Afghan, Arabic, Australian, Iranian, Muslim, Parsi
Assister; Friend
Boy/Male
Australian, Hebrew, Irish
God has Helped
Surname or Lastname
German
German : nickname for someone with boils or lumpy skin, or perhaps for a hunchback, from Middle High German maser ‘lump’, ‘protuberance’.German and English : from Middle High Germanmaser, Middle English maser ‘maple-wood bowl’ (Old French masere, of Germanic origin), hence a metonymic occupational name for a wood-turner producing such ware.English : variant spelling of Macer, an occupational name for a mace-bearer, from Old French maissier, massier, a derivative of Old French masse ‘mace’.German (Maaser) : pet form of Thomas.
Male
Yiddish
(לֵייזֶער) Yiddish form of Hebrew Elazar, LAZER means "my God has helped."
Surname or Lastname
English
English : occupational name for a maker of cord and string, derived from Middle English lace ‘cord’ (Old French laz, las).
Boy/Male
Indian
Helper of God, One who helps, Assister, Friend, One who scatters, Exposer, Announcer, Protector, Supporter
Girl/Female
Hindu
The wave
Biblical
thick; wise
Boy/Male
Afghan, Arabic, Australian, Muslim
Wealthy
Surname or Lastname
English
English : habitational name from any of three places in Essex – Layer Breton, Layer de la Haye, and Layer Marney – all named from a river name, Leire, or from Leire in Leicestershire, also named from an identical river name. The river name is of Celtic origin and is probably the base of the tribal name Ligore, found in the place name Leicester.English : nickname or status name from Anglo-Norman French le eyr ‘the heir’. Compare Ayer.English : occupational name for a stone layer, Middle English leyer; the job of the layer was to position the stones worked by the masons.German : habitational name for someone from any of the various placed named Lay, in the Rhineland and Bavaria.
Boy/Male
Muslim
Lives forever
Girl/Female
Biblical
Thick, wise.
Surname or Lastname
English (East Anglia)
English (East Anglia) : variant of Lester.English (East Anglia) : occupational name for a maker of cobblers’ lasts, from Middle English last, lest, the wooden form in the shape of a foot used for making or repairing shoes (Old English lÇ£ste from lÄst ‘footprint’).
Surname or Lastname
English
English : occupational name for a washerman, Anglo-Norman French laver (an agent derivative of Old French laver ‘to wash’, Latin lavare).English : habitational name from High, Little or Magdalen Laver in Essex, named from Old English lagu ‘flood’, ‘water’ + fær ‘passage’, ‘crossing’.English : topographic name for someone living where bulrushes or irises grew, Old English lǣfer.
Boy/Male
Muslim
Helper of God, One who helps, Assister, Friend, One who scatters, Exposer, Announcer, Protector, Supporter
ACTIVE LASER-MEDIUM
ACTIVE LASER-MEDIUM
Male
French
French form of Roman Latin Valerius, VALÈRE means "to be healthy, to be strong."Â
Girl/Female
Tamil
Shrestajna | à®·à¯à®°à¯‡à®¸à¯à®¤à®¾à®œà®¨à®¾
Top knowledge
Boy/Male
French
From the willow farm.
Boy/Male
Bengali, Hindu, Indian, Marathi, Sanskrit, Telugu
Handsome
Girl/Female
Tamil
Dirty stunted grass
Boy/Male
Arabic, Muslim
Gift of the Beneficent
Boy/Male
English
Terran means 'Earthman.' Variants are contemporary rhyming blends of Ter- plus Darin.
Surname or Lastname
English
English : variant spelling of Twyford.
Surname or Lastname
English
English : variant of Terry 1.
Boy/Male
American, Arabic, Australian
Safe; Intimate Companion
ACTIVE LASER-MEDIUM
ACTIVE LASER-MEDIUM
ACTIVE LASER-MEDIUM
ACTIVE LASER-MEDIUM
ACTIVE LASER-MEDIUM
n.
The fronds of certain marine algae used as food, and for making a sauce called laver sauce. Green laver is the Ulva latissima; purple laver, Porphyra laciniata and P. vulgaris. It is prepared by stewing, either alone or with other vegetables, and with various condiments; -- called also sloke, or sloakan.
a.
Not active; having no power to move; that does not or can not produce results; inert; as, matter is, of itself, inactive.
a.
Applied to all verbs that express action as distinct from mere existence or state.
v. t.
To make active.
a.
Requiring or implying action or exertion; -- opposed to sedentary or to tranquil; as, active employment or service; active scenes.
a.
Implying or producing rapid action; as, an active disease; an active remedy.
a.
Given to action rather than contemplation; practical; operative; -- opposed to speculative or theoretical; as, an active rather than a speculative statesman.
a.
Acting in concurrence; united in action.
adv.
In an active signification; as, a word used actively.
adv.
In an active manner; nimbly; briskly; energetically; also, by one's own action; voluntarily, not passively.
a.
Applied to a form of the verb; -- opposed to passive. See Active voice, under Voice.
a.
In action; actually proceeding; working; in force; -- opposed to quiescent, dormant, or extinct; as, active laws; active hostilities; an active volcano.
a.
Given to action; constantly engaged in action; energetic; diligent; busy; -- opposed to dull, sluggish, indolent, or inert; as, an active man of business; active mind; active zeal.
a.
Having the power or quality of acting; causing change; communicating action or motion; acting; -- opposed to passive, that receives; as, certain active principles; the powers of the mind.
n.
Lager beer.
n.
That which is laid; a stratum; a bed; one thickness, course, or fold laid over another; as, a layer of clay or of sand in the earth; a layer of bricks, or of plaster; the layers of an onion.
a.
Brisk; lively; as, an active demand for corn.
a.
Quick in physical movement; of an agile and vigorous body; nimble; as, an active child or animal.
a.
Doing; active.
a.
Not active; inert; esp., not exhibiting any action or activity on polarized light; optically neutral; -- said of isomeric forms of certain substances, in distinction from other forms which are optically active; as, racemic acid is an inactive tartaric acid.