H
SECTION H — ELECTRICITY
 H01
BASIC ELECTRIC ELEMENTS
 H01

Note(s)

Processes involving only a single technical art, e.g. drying, coating, for which provision exists elsewhere are classified in the relevant class for that art.

 H01S
DEVICES USING STIMULATED EMISSION
 H01S

Note(s)

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]

 H01S 1/00
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
 H01S 1/02
·  solid
 H01S 1/04
·  liquid
 H01S 1/06
·  gaseous
 H01S 3/00
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
 H01S 3/02
·  Constructional details
 H01S 3/03
·  ·  of gas laser discharge tubes  [2]
 H01S 3/04
·  ·  Cooling arrangements
 H01S 3/045
·  ·  ·  Cooling the active medium  [2]
 H01S 3/05
·  Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
 H01S 3/06
·  ·  Construction or shape of active medium
 H01S 3/07
·  ·  ·  consisting of a plurality of parts, e.g. segments, optical fibres  [2]
 H01S 3/08
·  ·  Construction or shape of optical resonators or components thereof  [2]
 H01S 3/081
·  ·  ·  comprising more than two reflectors  [2]
 H01S 3/082
·  ·  ·  ·  defining a plurality of resonators, e.g. for mode selection  [2]
 H01S 3/083
·  ·  ·  ·  Ring lasers (laser gyrometers G01C 19/64)  [2]
 H01S 3/086
·  ·  ·  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]
 H01S 3/09
·  Processes or apparatus for excitation, e.g. pumping
 H01S 3/091
·  ·  using optical pumping  [2]
 H01S 3/092
·  ·  ·  by flash lamp  [2]
 H01S 3/093
·  ·  ·  ·  focusing or directing the excitation energy into the active medium  [2]
 H01S 3/094
·  ·  ·  by laser  [2]
 H01S 3/095
·  ·  using chemical or thermal pumping  [2]
 H01S 3/096
·  ·  by applying a potential to the electrodes of a semiconductor laser  [2]
 H01S 3/097
·  ·  by gas discharge of a gas laser  [2]
 H01S 3/098
·  Mode locking; Mode suppression (mode suppression using a plurality of resonators H01S 3/082)  [2]
 H01S 3/10
·  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]
 H01S 3/101
·  ·  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]
 H01S 3/102
·  ·  by controlling the active medium, e.g. by controlling the processes or apparatus for excitation (H01S 3/13 takes precedence)  [4]
 H01S 3/103
·  ·  ·  in semiconductor lasers  [4]
 H01S 3/104
·  ·  ·  in gas lasers  [4]
 H01S 3/105
·  ·  by controlling the mutual position or the reflecting properties of the reflectors of the cavity (H01S 3/13 takes precedence)  [4]
 H01S 3/1055
·  ·  ·  one of the reflectors being constituted by a diffraction grating  [4]
 H01S 3/106
·  ·  by controlling a device placed within the cavity (H01S 3/13 takes precedence)  [4]
 H01S 3/107
·  ·  ·  using an electro-optical device, e.g. exhibiting Pockels- or Kerr-effect  [4]
 H01S 3/108
·  ·  ·  using a non-linear optical device, e.g. exhibiting Brillouin- or Raman-scattering  [4]
 H01S 3/109
·  ·  ·  ·  Frequency multiplying, e.g. harmonic generation  [4]
 H01S 3/11
·  ·  in which the quality factor of the optical resonator is rapidly changed, i.e. giant-pulse technique
 H01S 3/111
( transferred to H01S 3/121 )
 H01S 3/113
·  ·  ·  using bleachable or solarising media  [2]
 H01S 3/115
·  ·  ·  using an electro-optical device  [4]
 H01S 3/117
·  ·  ·  using an acousto-optical device  [4]
 H01S 3/121
·  ·  ·  using a mechanical device  [4]
 H01S 3/123
·  ·  ·  ·  Rotating mirror  [4]
 H01S 3/125
·  ·  ·  ·  Rotating prism  [4]
 H01S 3/127
·  ·  ·  Plural Q-switches  [4]
 H01S 3/13
·  ·  Stabilisation of laser output parameters, e.g. frequency, amplitude  [2]
 H01S 3/131
·  ·  ·  by controlling the active medium, e.g. by controlling the processes or apparatus for excitation  [4]
 H01S 3/133
·  ·  ·  ·  in semiconductor lasers  [4]
 H01S 3/134
·  ·  ·  ·  in gas lasers  [4]
 H01S 3/136
·  ·  ·  by controlling a device placed within the cavity  [4]
 H01S 3/137
·  ·  ·  ·  for stabilising of frequency  [4]
 H01S 3/139
·  ·  ·  by controlling the mutual position or the reflecting properties of the reflectors of the cavity  [4]
 H01S 3/14
·  characterised by the material used as the active medium
 H01S 3/16
·  ·  solid materials
 H01S 3/17
·  ·  ·  amorphous, e.g. glass  [2]
 H01S 3/18
·  ·  ·  semi-conducting material
 H01S 3/19
·  ·  ·  ·  with PN junction  [2]
 H01S 3/20
·  ·  liquids
 H01S 3/22
·  ·  gases
 H01S 3/223
·  ·  ·  polyatomic  [2]
 H01S 3/23
·  Arrangements of two or more lasers not provided for in groups H01S 3/02-H01S 3/22, e.g. tandem arrangements of separate active media  [2]
 H01S 3/30
·  using scattering effects, e.g. stimulated Brillouin or Raman effects  [2]
 H01S 4/00
Devices using stimulated emission of wave energy other than those covered by groups H01S 1/00 or H01S 3/00, e.g. phonon maser, gamma maser