Apparatus for and method of identifying spectrally pure optical

Details Apparatus for and method of identifying spectrally pure optical Apparatus for and method of identifying spectrally pure optical

1990-02-23

1992-05-26

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356346, G01B 902

Patent

active

051161338

ABSTRACT:
Spectrally pure optical radiation (SPOR) such as laser radiation is effectively distinguished from broadband optical radiation such as sunlight and herein called radiation of unknown spectral purity (RUSP) by apparatus including an etalon, which apparatus determines balance or unbalance between the respective portions of a signal incident on the etalon that are reflected by and transmitted through the etalon. Unbalance between the two signal portions indicates the presence of SPOR. The intensities of the reflected and transmitted radiation are compared and a determination of inequality or unbalance indicates SPOR whereas equality or balance indicates spectrally impure radiation. Measurement of the sum of the intensities of the reflected and transmitted radiation also provides an estimate of the angle of incidence of RUSP on the etalon.
The invention also comprehends the method of identifying SPOR consisting of the steps of directing RUSP toward an etalon, comparing the intensities of the transmitted and reflected radiation, and indicating that RUSP is SPOR if the intensities are unequal or unbalanced. The method also includes measuring the sum of intensities of the reflected and transmitted radiation to provide an estimate of the angle of incidence of RUSP.

REFERENCES:
patent: 3824018 (1974-07-01), Crane, Jr.
patent: 4170416 (1979-10-01), Fencil
patent: 4594002 (1986-06-01), McNally
patent: 4595292 (1986-06-01), Amodeo et al.
patent: 4600307 (1986-07-01), Krohn et al.
patent: 4743114 (1988-05-01), Crane, Jr.

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