Second-harmonic wave generating element

Details Second-harmonic wave generating element Second-harmonic wave generating element

1991-01-24

1992-06-09

Davie, James W.

Optical: systems and elements

Optical frequency converter

Harmonic generator

372 22, 372 96, H03F 700

Patent

active

051212501

ABSTRACT:
An element for generating second-harmonic waves of a short wavelength from a fundamental wave emitting from a semiconductor laser and the like. The element includes a substrate made of a ferroelectric crystal, a second-harmonic wave generator for generating a second-harmonic wave from a fundamental wave entered therein, and periodically arranged portions formed in a front stage region and a rear stage region of the element. The periodic portions or structures, each have pairs of parts or regions of a high optical refractive index and of a low optical refractive index so as to confine the fundamental waves in the second-harmonic wave generating portion. These regions have various kinds of material diffused or introduced therein and of a thickness. According to another example of the element, the sign of a nonlinear optical coefficient of the region is periodically reversed and the region satisfies a quasi-phase-matching condition.

REFERENCES:
patent: 5036220 (1991-07-01), Byer et al.
Japanese Journal of Applied Physics, vol. 6, No. 3, Mar. 1967, pp. 318-327, "Growth Ridges, Etched Hillocks, and Crystal Structure of Lithium Niobate", Niizeki, et al.
Applied Physics Letters, vol. 47 (11) Dec. 1985, pp. 1125-1127, "Current induced periodic ferroelectric domain structure in LiNbO.sub.3 applied for efficient nonlinear optical frequency mixing", Feisst, et al.
Applied Physcis Letters, vol. 37 (7), Oct. 1980, pp. 607-609, "Enhancement of second-harmonic generation in LiNbO.sub.3 crystals with periodic laminar ferroelectric domains", Feng, et al.
Optics Communications, vol. 6, No. 3, Nov. 1972, pp. 301-304, "Phase Matching By Periodic Modulation of the Nonlinear Optical Properties", Somekh, et al.
Shingaku Giho (Ieice Technical Report), MW 87-113, Feb. 24, 1988, pp. 23-30, "The Angle Phase Matching Type SHG Device using Ti-diffused LiNbO.sub.3 Channel Type Waveguide".
Electronics Letters, Feb. 2nd, 1989, vol. 25, No. 3, "Second-Harmonic Generation of Green Light In Periodically Poled Planar Lithium Niobate Waveguide", E. J. Lim et al.
Physical Review, Sep. 15th, 1962, vol. 127, No. 6, "Interactions Between Light Waves In A Nonlinear Dielectric", J. A. Armstrong et al.
IEEE Journal of Quantium Electronics, Jun. 1988, vol. 24, No. 6, "Efficient Second Harmonic Generation of a Diode-Laser-Pumped CW Nd: YAG Laser Using Monolithic MgO: LiNbO.sub.3 External Resonant Cavities".

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