Single mode laser emission

Details Single mode laser emission Single mode laser emission

1983-09-16

1986-02-25

Sikes, William L.

Coherent light generators

Particular beam control device

Mode discrimination

372 20, 372 44, 372 92, 372 99, 350 17, 350166, H01S 3098

Patent

active

045731560

ABSTRACT:
Disclosed is an optical device producing single mode laser emission. The device includes a semiconductor laser which would normally emit a number of closely spaced longitudinal modes and a filter which receives light from the laser active layer and reflects light back to the active layer. The filter includes at least one thin, optically absorbing layer, a dielectric layer, and a reflecting layer. The thickness and refractive indices of the layers are such that the filter reflectivity has a number of narrow maxima, but only one which lies within the gain bandwidth of the laser. The width of the peak and the background amplitude between peaks is such that only a single longitudinal mode of the laser is allowed to oscillate.

REFERENCES:
patent: 3645600 (1972-02-01), Doctoroff et al.
patent: 3799654 (1974-03-01), Donne
patent: 4009453 (1977-01-01), Mahlein
patent: 4408825 (1983-10-01), Stelmack
"Reflection and Transmission Interference Filters," L. N. Hadley et al., Journal of Optical Society of America, vol. 37, p. 451, (1947), and vol. 38, p. 483, (1948).
"Tunable Metal Film Filters as Narrowband IR Laser Reflectors," W. R. Leeb, Applied Optics, vol. 15, No. 3, pp. 681-689, (Mar. 1976).
"CO.sub.2 Laser Line Selection with Metal Film Reflector," W. R. Leeb, AEU Archive Elek. Ueber, vol. 32, pp. 186-190, (1978).

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