Coherent light generators – Particular resonant cavity – Folded cavity
Patent
1990-12-20
1992-11-24
Scott, Jr., Leon
Coherent light generators
Particular resonant cavity
Folded cavity
372 19, 372 29, 356350, H01S 3083
Patent
active
051669498
ABSTRACT:
A dielectric interference film having a central region of one thickness and a peripheral region of a different thickness is superimposed on one of the mirrors of a ring laser gyroscope for the purpose of suppressing off-axis resonant modes that are characteristic of a resonant cavity. The central region is designed to intercept a large portion of the fundamental mode power and a lesser portion of the off-axis mode power. The difference in thickness between the central and peripheral regions causes the reflected light from the two regions to differ in phase by approximately one-half wavelength and destructively interfere. As a result of the imbalance of the fundamental and off-axis mode powers incident on the central region, the reflectivity losses of the off-axis modes are more pronounced than those of the fundamental mode with the result that the off-axis modes are completely suppressed.
REFERENCES:
patent: 3323411 (1967-06-01), Killpatrick
patent: 4110045 (1978-08-01), Smith, Jr. et al.
patent: 4519708 (1985-05-01), Perlmutter
patent: 4627732 (1986-12-01), Perlmutter
Anderson Terry J.
Block Robert B.
Hoch Jr. Karl J.
Jr. Leon Scott
Northrop Corporation
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