Optical spectrum analyzer and process for analyzing the correspo

Details Optical spectrum analyzer and process for analyzing the correspo Optical spectrum analyzer and process for analyzing the correspo

1997-10-02

1999-03-23

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356334, G01J 318

Patent

active

058867856

ABSTRACT:
The invention relates to an optical spectrum analyzer of an incident light beam (101) and a process for analyzing the corresponding spectrum. The spectrum analyzer comprises addressing means (1), a diffraction grating (2), a reflecting dihedron (3), a device (4) for adjusting the rotation of the reflecting dihedron and reception means (5). A polarization separator (11) divides the incident beam (101) into a first and second parallel secondary beam (102, 104), of linearly polarized light along the directions parallel to and perpendicular to the grooves in the grating respectively, and a .lambda./2 plate (12) placed on the path of the first secondary beam (102) applies a perpendicular polarization direction to this beam. The grating diffracts the secondary beams (103, 104) a first time, the reflecting dihedron exchanges their directions, the grating diffracts them a second time, the .lambda./2 plate applies a 90.degree. rotation to the polarization state of the second secondary beam (110) and the separator recombines the secondary beams (109, 111) into a single main beam (112) returned to reception means.

REFERENCES:
J.P. Sage et al., "High Power Funable Dual Frequency Laser System", Optics Communications, vol. 42, No. 6, 1982, Amsterdam, Netherlands, pp. 428-430.

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