Light generating device and method using a periodically structur

Details Light generating device and method using a periodically structur Light generating device and method using a periodically structur

1996-11-20

1998-07-28

Healy, Brian

Coherent light generators

Particular beam control device

Nonlinear device

372 21, 372 23, 372 27, 372102, 372106, 359326, 359346, 385122, 385 11, H01S 310, G02F 135, G02B 600

Patent

active

057871027

ABSTRACT:
A non-linear optical device in which quasi-phase matching between different optical waves of differing polarizations and refractive indices increases the interaction length between the waves. The quasi-phase matching structure includes a periodic structure over which the non-linear coefficient varies with a given period, preferably the sign of the non-linear coefficient being inverted between two alternating regions. In LiNbO.sub.3, the periodic structure can be achieved by electrical poling. The required period length is increased by selecting light waves of different polarizations for the non-linear interaction such that a large portion of the dispersion between the waves of different wavelength is compensated by the birefringence of the waves of different polarization. In particular, periodic poling can quasi-phase match radiation in the range of 0.80 .mu.m to 1.2 .mu.m to generate second harmonic generation radiation in the blue and green visible spectrum.

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