DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL

Introduced: September 1968

Description

H01S covers laser devices and stimulated emission sources operating across electromagnetic spectrum ranges from ultraviolet through microwave frequencies. The subclass encompasses laser construction (optical cavities, active media, pumping mechanisms), laser types (solid-state, gas, semiconductor, fiber, dye lasers), and masers and related devices operating at non-optical wavelengths. Related amplification and generation of electromagnetic radiation through stimulated emission principles fall within this classification, while specific laser applications in materials processing, measurement, or communications are typically addressed in specialized classes (B, G, H sections).

Of 8 combined children, 4 exist in both systems.

4 codes are CPC-only extensions.

Note: 4 CPC extensions are marked as secondary classification only.

3 shared codes have differing titles between IPC and CPC.

Child Classifications

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H01S 1/00 Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range +1 CPC IPC+CPC Available in IPC and CPC
H01S 2301/00 Functional characteristics 2nd only +10 CPC CPC only CPC only
H01S 2302/00 Amplification / lasing wavelength 2nd only +1 CPC CPC only CPC only
H01S 2303/00 Pumping wavelength 2nd only CPC only CPC only
H01S 2304/00 Special growth methods for semiconductor lasers 2nd only +5 CPC CPC only CPC only
H01S 3/00 Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range (semiconductors lasers H01S5/00) +3 CPC IPC+CPC Available in IPC and CPC
H01S 4/00 Devices using stimulated emission of electromagnetic radiation in wave ranges other than those covered by groups H01S1/00, H01S3/00 or H01S5/00, e.g. phonon masers, X-ray lasers or gamma-ray lasers IPC+CPC Available in IPC and CPC
H01S 5/00 Semiconductor lasers (superluminescent diodes H10H20/00) since 2000 +2 CPC IPC+CPC Available in IPC and CPC