Wave length plate, wavelength filter and wavelength monitor

Details Wave length plate, wavelength filter and wavelength monitor Wave length plate, wavelength filter and wavelength monitor

2007-07-03

2007-07-03

Nguyen, Dung T. (Department: 2828)

Coherent light generators

Particular beam control device

Nonlinear device

C372S022000, C372S044011

Reexamination Certificate

active

10250454

ABSTRACT:
On a plate of birefringent crystal made of an LiNbO3crystal or an LiTaO3crystal, a conductive substance is adhered to the whole periphery of side surfaces of the plate that intersect an incident surface of a laser beam, thereby to form a wave plate. A polarizer is provided at the latter stage of the wave plate. A wavelength is monitored based on an output from the polarizer. With this arrangement, based on the use of the LiNbO3crystal or the LiTaO3crystal that can be manufactured by a large quantity at low cost, it is possible to obtain polarization characteristics and wavelength discrimination characteristics that are stable against environmental changes such as temperature and external stress, by suppressing the pyroelectric effect and the piezoelectric effect of these materials.

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“Laser Optics, Coatings, Crystals and Cavities,” Brochure of VLOC, pp. 8-13, USA.
Unpublished U.S. Appl. No. 10/477,113, Yasunori Nishimura et al., “Wavelength Monitor, Optical Module, and Optical Module Packaging Method”, Filed Nov. 7, 2003.

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