Coherent light generators – Particular beam control device – Nonlinear device
Reexamination Certificate
2006-11-14
2006-11-14
Rodriquez, Armando (Department: 2828)
Coherent light generators
Particular beam control device
Nonlinear device
C372S092000, C372S006000
Reexamination Certificate
active
07136402
ABSTRACT:
A laser device which can be used as a light source for an exposure device, can be downsized, and is easy to maintain. A laser beam (LB6) emitted from a DFB (Distributed feedback) semiconductor laser, for example, and amplified by an optical fiber amplifier is passed through non-linear optical crystals (502, 503, 504) to be sequentially doubled in frequency to thereby generate an ultraviolet-region laser beam (LB5) consisting of an octuple wave. A GdYCOB, that is, GdxY1−xCa4O(BO3)3crystal (0≦×≦1) is used for the non-linear optical crystal (503) for a double wave-to-quadruple wave conversion, and a KAB, that is, K2Al2B4O7crystal for the non-linear optical crystal (504) for a quadruple wave-to-octuple wave conversion. The non-linear optical crystals (502-504) are all fine-tuned in phase match angle by temperature controllers (521-523) respectively.
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Nikon Corporation
Rodriquez Armando
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