IPC 7 English version H01S !A-H01S 3/30

IPC ⁷ English version

H01S-H01S00330

H01S 4/00 - H01S 5/50

SECTION H – ELECTRICITY

H 01

BASIC ELECTRIC ELEMENTS

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

solid

liquid

gaseous

Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves (semiconductor lasers H01S 5/00)

Constructional details

025

(transferred to H01S 5/02)

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 H01S 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 H01S 3/041; gas dynamic lasers H01S 3/0979) [5]

038

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

Cooling arrangements

041

for gas lasers [5]

042

for solid state lasers [5]

043

(transferred to H01S 5/024)

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

Construction or shape of active medium

063

Waveguide lasers, e.g. laser amplifiers [7]

067

Fibre lasers [7]

consisting of a plurality of parts, e.g. segments (H01S 3/067 takes precedence) [2,7]

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 G01C 19/66) [2]

085

(transferred to H01S 5/10)

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 H01S 3/10; stabilisation of the laser output H01S 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 (H01S 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]

0943

of a gas laser [5]

0947

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

(transferred to H01S 5/042)

097

by gas discharge of a gas laser [2]

0971

transversely excited (H01S 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 H01S 3/082) [2]

Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating (mode locking H01S 3/098; controlling of light beams, frequency-changing, non-linear optics, optical logic elements, in general G02F) [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 G02B 26/10; devices or arrangements for the electro-, magneto-, or acousto-optical deflection G02F 1/29) [2]

102

by controlling the active medium, e.g. by controlling the processes or apparatus for excitation (H01S 3/13 takes precedence) [4]

103

(transferred to H01S 5/06)

104

in gas lasers [4]

105

by controlling the mutual position or the reflecting properties of the reflectors of the cavity (H01S 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 (H01S 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]

123

Rotating mirror [4]

125

Rotating prism [4]

127

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

(transferred to H01S 5/068)

134

in gas lasers [4]

136

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]

(transferred to H01S 5/30)

(transferred to H01S 5/32)

Liquids

207

including a chelate [5]

213

including an organic dye [5]

Gases

223

the active gas being polyatomic, i.e. containing more than one atom (H01S 3/227 takes precedence) [2,5]

225

comprising an excimer or exciplex [5]

227

Metal vapour [5]

Arrangement of two or more lasers not provided for in groups H01S 3/02 to H01S 3/22, e.g. tandem arrangement of separate active media (involving only semiconductor lasers H01S 5/40) [2,7]

(transferred to H01S 5/40)

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

H01S 4/00 - H01S 5/50