Diffraction grating beam splitter in a laser resonator length co

Details Diffraction grating beam splitter in a laser resonator length co Diffraction grating beam splitter in a laser resonator length co

1983-03-31

1985-10-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250225, 372 32, G01J 132

Patent

active

045476640

ABSTRACT:
The invention contemplates a beam splitter which consists of a phase grating (5) which transmits at zero order the greatest part of the radiation of a two-mode laser (1) and which diffracts a relatively small part of the radiation, symmetrically at 1 order and -1 order, respectively. The intensity of components of the radiation polarized perpendicular to each other and associated with the two modes is measured by detectors (11, 12) in front of which polarization sheets (9, 10) are arranged as analyzers, and outputs of the detectors are used to regulate the center frequency of the laser tube (1).

REFERENCES:
patent: 3392400 (1968-07-01), Lamberts et al.
patent: 3588738 (1971-06-01), Goodwin
patent: 3650595 (1972-03-01), Gerritsen et al.
patent: 4314211 (1982-02-01), Mollenauer
patent: 4474467 (1984-10-01), Hardy et al.

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