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 sub-class includes devices for the generation or amplification, by using stimulated emission, of coherent electromagnetic waves or other forms of wave energy. Also included are 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, e.g. gyrometers (gyrometers in general G01C 19/00)  [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; modulating or demodulating light 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-mechanical scanning systems in general G02B 27/17; electro-, magneto-, or acousto-optical deflection G02F 1/29; control of position or direction of light beam generating device in general G05D 3/02)  [2]
 H01S 3/11
·  ·  in which the quality factor of the optical resonator is rapidly changed, i.e. giant-pulse technique
 H01S 3/111
·  ·  ·  using rotating reflectors  [2]
 H01S 3/113
·  ·  ·  using bleachable or solarising media  [2]
 H01S 3/12
( covered by H01S 3/09-H01S 3/11 )
 H01S 3/13
·  ·  Stabilization of laser output parameters, e.g. frequency, amplitude  [2]
 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 and H01S 3/00, e.g. phonon maser, gamma maser