Laser output power measuring method and apparatus

Details Laser output power measuring method and apparatus Laser output power measuring method and apparatus

1989-03-09

1990-11-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

372 99, H01J 314

Patent

active

049703838

ABSTRACT:
A laser unit, including an optical power measuring device, measures, as the beam sample, a portion of the laser beam that is reflected out of the laser beam path by a wedge shaped front mirror, that is, an optical wedge. The front mirror has two surfaces, a partially reflective surface which reflects a portion of the beam back into the laser cavity and a nominally non-reflecting surface which permits a portion of the beam to exit the laser. The non-reflecting surface does in fact reflect some energy and, because of the wedge shape of the mirror, this energy is directed away from the laser beam path. The intensity of this off-path reflection is measured to determine the laser output power.

REFERENCES:
patent: 4715689 (1987-12-01), O'Meara et al.
patent: 4812641 (1989-03-01), Ortiz

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