Coherent light generators – Particular beam control device – Nonlinear device
Patent
1992-05-05
1993-09-07
Davie, James W.
Coherent light generators
Particular beam control device
Nonlinear device
359328, 372105, 372 34, H01S 310
Patent
active
052436110
ABSTRACT:
In an optical wavelength converting apparatus, a laser beam serving as a fundamental wave and having been obtained by pumping a solid laser medium is caused to impinge upon a nonlinear optical crystal, and the type II of phase matching between the fundamental wave and its second harmonic is effected. The second harmonic of the fundamental wave is thereby radiated out of the optical wavelength converting apparatus. A solid laser medium, which produces a linearly polarized fundamental wave in two longitudinal modes, is employed as the solid laser medium. A device for adjusting a difference in phase of the fundamental wave due to the nonlinear optical crystal and a device for adjusting the temperatures of the nonlinear optical crystal and a resonator, such that the temperatures may be kept at predetermined values, are provided in order to work such that two directions of polarization of the fundamental wave may intersect approximately perpendicularly to each other and may respectively incline approximately 45.degree. with respect to an optic axis of the nonlinear optical crystal. The second harmonic having stable output power and free of any noise is thus obtained.
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Oka et al., "Stable Intractivity Doubling of Orthogonal Linearly Polarized Modes in Diode-Pumped ND:YAG Lasers", Optics Letters, vol. 13, p. 805, Oct. 1988.
Hyuga Hiroaki
Okazaki Yoji
Davie James W.
Fuji Photo Film Co. , Ltd.
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