Low coupling beam splitter and laser power or position monitor u

Details Low coupling beam splitter and laser power or position monitor u Low coupling beam splitter and laser power or position monitor u

1989-10-05

1991-03-26

Arnold, Bruce Y.

Coherent light generators

Particular component circuitry

Optical pumping

350286, 372100, 372106, G02B 2728, G02B 504, G02B 530

Patent

active

050023713

ABSTRACT:
A low coupling beam splitter with no cross-polarization error or critical alignment tolerances is formed of a quartz piece having a first planar face in the optical path in the plane of the cross-polarization and at or near Brewster's angle to the beam. A second planar face is in the interior optical path in the plane of the cross-polarization and off of Brewster's angle to the beam, so that a majority of the component having the dominant polarization is transmitted along the optical path, while a small fraction of the component having the dominant polarization and a portion of the cross-polarized component are reflected along a first interior sample path. A third planar face is in the first interior sample path in the plane of the dominant polarization and at or near Brewster's angle to the reflected beam. Thus, a portion of the component having the dominant polarization is reflected as a sample beam, and the majority of the component having the cross-polarization is transmitted away from the sample beam. A standard photodetector can be placed in the sample path for monitoring the power or position of the beam, with no error due to the cross-polarized component.

REFERENCES:
patent: 4504123 (1985-03-01), Smith
patent: 4509830 (1985-04-01), Kato et al.
patent: 4525034 (1985-06-01), Simmons
patent: 4832469 (1989-05-01), Noguchi et al.
patent: 4844584 (1989-07-01), Miyagawa
Chatwin et al., "Efficient Laser Power and Energy Monitoring Using an Uncoated Wedge," Applied Optics, vol. 28, No. 1, Jan. 15, 1989, pp. 209-211.

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