(0)H01S:0/1:

IPC6

SECTION H - ELECTRICITY

DEVICES USING STIMULATED EMISSION

H01S

1/2

H01S001/00 - H01S003/30

H 01 S

DEVICES USING STIMULATED EMISSION

Note

This subclass covers:

-	devices for the generation or amplification, by using stimulated emission, of coherent electromagnetic waves or other forms of wave energy; [2]

-	such functions as modulating, demodulating, controlling, or stabilising such waves. [2]

Masers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of electromagnetic waves of wavelength longer than that of infra-red waves

Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves

•

Constructional details

025

•

of semiconductor lasers, e.g. mountings, coatings (H 01 S 3/043 takes precedence) [5]

•

of gas laser discharge tubes [2]

032

•

for confinement of the discharge, e.g. by special features of the discharge constricting tube [5]

034

•

Optical devices within, or forming part of, the tube, e.g. windows, mirrors (reflectors having variable properties or positions for initial adjustment of the resonator H 01 S 3/086) [5]

036

•

Means for obtaining or maintaining the desired gas pressure within the tube, e.g. by gettering, replenishing; Means for circulating the gas, e.g. for equalising the pressure within the tube (cooling arrangements for gas lasers H 01 S 3/041; gas dynamic lasers H 01 S 3/0979) [5]

038

•

Electrodes, e.g. special shape, configuration or compositon [5]

for solid state lasers [5]

043

•

for semiconductor lasers [5]

•

Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium

•

Construction or shape of active medium

•

consisting of a plurality of parts, e.g. segments, optical fibres [2]

•

Construction or shape of optical resonators or components thereof [2]

081

•

comprising more than two reflectors [2]

082

•

defining a plurality of resonators, e.g. for mode selection [2]

083

•

Ring lasers (ring laser gyrometers G 01 C 19/66) [2]

085

•

for semiconductor lasers [5]

086

•

One or more reflectors having variable properties or positions for initial adjustment of the resonator (varying a parameter of the laser output during operation H 01 S 3/10; stabilisation of the laser output H 01 S 3/13) [2]

•

Processes or apparatus for excitation, e.g. pumping

091

•

using optical pumping [2]

0915

•

by incoherent light [5]

092

•

of flash lamp (H 01 S 3/0937 takes precedence) [2,5]

093

•

focusing or directing the excitation energy into the active medium [2,5]

0933

•

of a semiconductor, e.g. light emitting diode [5]

0937

•

produced by exploding or combustible material [5]

094

•

by coherent light [2]

0941

•

of a semiconductor laser, e.g. of a laser diode [6]

of an organic dye laser [5]

095

•

using chemical or thermal pumping [2]

0951

•

by increasing the pressure in the laser gas medium [5]

0953

•

Gas dynamic lasers, i.e. with expansion of the laser gas medium to supersonic flow speeds [5]

0955

•

using pumping by high energy particles [5]

0957

•

by high energy nuclear particles [5]

0959

•

by an electron beam [5]

096

•

by applying a potential to the electrodes of a semiconductor laser [2]

097

•

by gas discharge of a gas laser [2]

0971

•

transversely excited (H 01 S 3/0975 takes precedence) [5]

0973

•

having a travelling wave passing through the active medium [5]

0975

•

using inductive or capacitive excitation [5]

0977

•

having auxiliary ionisation means [5]

0979

•

Gas dynamic lasers, i.e. with expansion of the laser gas medium to supersonic flow speeds [5]

098

•

Mode locking; Mode suppression (mode suppression using a plurality of resonators H 01 S 3/082) [2]

•

Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating (mode locking H 01 S 3/098; controlling of light beams, frequency-changing, non-linear optics, optical logic elements, in general G 02 F) [2]

101

•

Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted (optical scanning systems in general G 02 B 26/10; devices or arrangements for the electro-, magneto-, or acousto-optical deflection G 02 F 1/29) [2]

102

•

by controlling the active medium, e.g. by controlling the processes or apparatus for excitation (H 01 S 3/13 takes precedence) [4]

103

•

in semiconductor lasers [4]

by controlling the mutual position or the reflecting properties of the reflectors of the cavity (H 01 S 3/13 takes precedence) [4]

1055

•

one of the reflectors being constituted by a diffraction grating [4]

106

•

by controlling a device placed within the cavity (H 01 S 3/13 takes precedence) [4]

107

•

using an electro-optical device, e.g. exhibiting Pockels- or Kerr-effect [4]

108

•

using a non-linear optical device, e.g. exhibiting Brillouin- or Raman-scattering [4]

109

•

Frequency multiplying, e.g. harmonic generation [4]

•

in which the quality factor of the optical resonator is rapidly changed, i.e. giant-pulse technique

113

•

using bleachable or solarising media [2]

115

•

using an electro-optical device [4]

117

•

using an acousto-optical device [4]

121

•

using a mechanical device [4]

Plural Q-switches [4]

•

Stabilisation of laser output parameters, e.g. frequency, amplitude [2]

131

•

by controlling the active medium, e.g. by controlling the processes or apparatus for excitation [4]

133

•

in semiconductor lasers [4]

by controlling a device placed within the cavity [4]

137

•

for stabilising of frequency [4]

139

•

by controlling the mutual position or the reflecting properties of the reflectors of the cavity [4]

•

characterised by the material used as the active medium

•

Solid materials

•

amorphous, e.g. glass [2]

•

Semiconducting material

including a chelate [5]

213

•

including an organic dye [5]

the active gas being polyatomic, i.e. containing more than one atom (H 01 S 3/227 takes precedence) [2,5]

225

•

comprising an excimer or exciplex [5]

Arrangement of two or more lasers not provided for in groups H 01 S 3/02 to H 01 S 3/22, e.g. tandem arrangements of separate active media [2]

•

of semiconductor lasers [5]

•

using scattering effects, e.g. stimulated Brillouin or Raman effects [2]