Unstable laser resonator with output coupler having radially var

Details Unstable laser resonator with output coupler having radially var Unstable laser resonator with output coupler having radially var

1990-01-10

1990-08-28

Scott, Jr., Leon

Coherent light generators

Particular resonant cavity

Unstable resonator

372108, 372 99, H01S 308

Patent

active

049531751

ABSTRACT:
Laser apparatus which generates a uniform laser beam of minimum divergence and maximum intensity includes a resonator cavity having a laser source and first and second mirror devices disposed on opposite sides of the source. The first mirror reflects pumped laser light within the cavity. The second mirror includes two mirror elements, both of which also reflect pumped laser light within the cavity. The two mirror elements of the second mirror device have specific configurations and a selected distance therebetween to cause the generation of a uniform output laser beam. That is, the laser light reflected from the second mirror element is dephased with respect to laser light reflected from the first mirror element by a whole number of periods of the laser light at the centerline between the first and second mirror elements. Also, laser light reflected from the second mirror is dephased with respect to laser light reflected from the first mirror by a whole number plus a half of the laser light period at the lateral edges of the first and second mirror elements.

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Bethen; "Megawatt Power", at 1.318.mu. in Nd.sup.3+ : YAG and Simultaneous Oscill. at Both 1.06 and 1.318.mu.; IEEE J. of Quant. Electronics; Feb. 1973.
Eichler et al; "Realization of a Mode-Selective Three-Mirror Reflector", IEEE J.Q.E., vol. QE-11, No. 4, pp. 168-170, Apr. 1975.
Perel et al; "The Effect of Movement of an Additional Mirror on the Intensity Produced by a Gas Laser"; Opt. Spect., vol. 37(3), Sep.'74.

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