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 deals with the generation, amplification, modulation, demodulation or frequency-changing of phase-coherent electromagnetic waves and other forms of wave energy by using stimulated emission

 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 3/04
·  ·  Cooling arrangements
 H01S 3/05
·  Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
 H01S 3/06
·  ·  Shape of active medium (making crystals B01J 17/00)
 H01S 3/08
·  ·  Construction or shape of optical resonator
 H01S 3/09
·  Processes or apparatus for excitation, e.g. pumping
 H01S 3/10
·  Frequency-changing, gating, modulating, or demodulating arrangements
 H01S 3/11
·  ·  in which the quality factor of the optical resonator is rapidly changed, i.e. giant-pulse technique
 H01S 3/12
·  ·  Circuit arrangements not adapted to a particular application
 H01S 3/14
·  characterised by the material used as the active medium
 H01S 3/16
·  ·  solid
 H01S 3/18
·  ·  ·  semi-conducting material
 H01S 3/20
·  ·  liquids
 H01S 3/22
·  ·  gaseous
 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