|  | 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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...H01S 1/00 and Fulltext... Hierarchy... Expanded...H01S 3/00, e.g. phonon maser, gamma maser