Mode discrimination apparatus

Details Mode discrimination apparatus Mode discrimination apparatus

1985-09-06

1986-12-09

Davie, James W.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350600, 372 19, 372 94, 372 99, G01C 1964, H01S 305

Patent

active

046277323

ABSTRACT:
In an optical system such as a ring laser gyroscope cavity, oscillations occur in many transverse modes. The desired modes are allowed to exist by suppressing undesired modes utilizing a light stop apparatus. One light stop is made by treating a dielectric mirror with an electron beam causing a phase change to occur to the undesired reflected waves. An alternative light stop is made by depositing an absorptive material on a dielectric mirror for absorbing some of the energy of the undesired modes. Both light stop embodiments are adjustable with respect to a laser wave in a resonant cavity.

REFERENCES:
patent: 3136959 (1964-06-01), Culver
patent: 3573656 (1971-04-01), Marcatili
patent: 4494373 (1985-01-01), Perlmutter et al.

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