Decentered annular ring resonator with internal misalignment can

Details Decentered annular ring resonator with internal misalignment can Decentered annular ring resonator with internal misalignment can

1983-08-29

1986-08-12

Davie, James W.

Coherent light generators

Particular resonant cavity

Unstable resonator

372 93, 372 99, 372103, 372108, H01S 308

Patent

active

046060367

ABSTRACT:
An improvement for a decentered annular ring resonator (DARR) 10 for a laser whereby misalignment sensitivity to odd-periodicity azimuthal phase errors is reduced. A front and a rear waxicon reflector 18 and 20 are employed, the front waxicon 18 having four reflecting surfaces 60,62,64 and 66 and the rear two 70 and 72. The laser beam is cycled between the waxicons twice, the front waxicon 18 separating the paths of the first and second cycle beams. The rear waxicon 20 provides a 180.degree. azimuthal shift in the orientation of an incoming beam 36 so that the beam traversing the second cycle 48,50, 52 is shifted 180.degree. in azimuth relative to the beam of the first cycle 40, 42,44. Odd-periodicity azimuthal phase errors are automatically cancelled by this 180.degree. azimuthal change in orientation of the second-cycle beam 46 before it starts on the second traversal of the internal path of the DARR.

REFERENCES:
patent: 4050036 (1977-09-01), Chambers et al.
patent: 4514850 (1985-04-01), Holmes et al.

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