Gas discharge laser having an asymmetrical coupling-out mirror

Details Gas discharge laser having an asymmetrical coupling-out mirror Gas discharge laser having an asymmetrical coupling-out mirror

1976-08-11

1979-01-02

Edlow, Martin H.

Oscillators

Molecular or particle resonant type

331 945D, 331 945T, 350163, 350164, 350165, H01S 300

Patent

active

041329597

ABSTRACT:
A gas discharge laser comprises a multilayer coupling-out mirror including a plurality of alternate dielectric layers of high (H) and low (L) indices of refraction. A radiation-attenuating film element, preferably a metal film, is sandwiched between a pair of L dielectric layers located near the mirror substrate to provide an asymmetrical characteristic whereby the laser becomes relatively insensitive to light reflected towards it, which in turn reduces any tendency toward fluctuation in the intensity of the laser beam. The device is especially useful in systems for reading out information from a video record carrier wherein the reflected light is modulated and if returned to the laser would produce output power fluctuations therein.

REFERENCES:
patent: 3569858 (1971-03-01), Witteman
patent: 3649359 (1972-03-01), Apfel
patent: 4009453 (1977-02-01), Mahlein
Laser Focus, vol. 5, No. 21, Nov. 1969, pp. 41-45.
Bouwhuis et al., Philips Tech. Rev., 33, No. 7, 1973, pp. 186-189.

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