Device and method for wavelength conversion

Details Device and method for wavelength conversion Device and method for wavelength conversion

1995-06-09

1997-01-07

Lee, John D.

Optical: systems and elements

Optical frequency converter

359330, 372 21, G02F 139

Patent

active

055923267

ABSTRACT:
A wavelength conversion device 10 comprises a laser device 12 for radiating light beams, a collimeter lens system 18 including lenses 14, 16 for adjusting the wavefront and diameter of a light beam to condense light, a resonator 26 comprising mirrors 22, 24 of the same radius of curvature, and a crystal 20 located inside the resonator 26 near beam-condensing sites and having a large receptive angle. The resonator 26 is a confocal resonator wherein the focus and center of curvature of the mirror 22 are equal to those of the mirror 24 and the radius of curvature of the mirrors 22, 24 exceeds the curvature of the wavefront of light beams from the collimeter lens system 18. Therefore, when a light beam is reflected from the mirrors 22, 24, the curvature of its wavefront is changed and an SHG light comprising only light beams that pass through the forward path is output efficiently.

REFERENCES:
patent: 4879722 (1989-11-01), Dixon et al.
patent: 5038352 (1991-08-01), Lenth et al.
patent: 5309454 (1994-05-01), Taira
patent: 5331650 (1994-07-01), Maeda et al.
patent: 5483374 (1996-01-01), Tanuma
D. Serkland et al., "Monolithic Total Internal Reflection Resonator for External Resonant Second-harmonic Generation of 2018nm", IEEE, Proc. of the Conference on Lasers and Electro-Optics, May 10-15, 1992, pp. 530-531.

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