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Solid State Source of Coherent Green Radiation

IP.com Disclosure Number: IPCOM000052620D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 20K

Publishing Venue

IBM

Related People

Jain, K: AUTHOR

Abstract

A technique for the generation of coherent green light is described which comprises frequency-doubling a GaInAsP diode laser in a Ti in diffused LiNbO(3) waveguide.

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Solid State Source of Coherent Green Radiation

A technique for the generation of coherent green light is described which comprises frequency-doubling a GaInAsP diode laser in a Ti in diffused LiNbO(3) waveguide.

The nonlinear process of harmonic generation requires a large power density at the fundamental frequency and the confinement of that power density over long interaction lengths. When the incident power is small, the only way to achieve this is by propagating the light as a guided wave in an optical waveguide. Efficient conversion of the fundamental power into harmonic power requires matching the phase velocities in the waveguide at the two frequencies. This phase-matching is maintained over long distances if the waves propagate at 90Degrees to the optic axis. Such synchronism, termed "noncritical matching," is wavelength dependent and a property of the nonlinear material.

Noncritical matching in Ti: LiNbO(3) waveguides occurs at a fundamental wavelength of Approximately 1.1 Mum.

Ti-indiffused LiNbO(3) waveguides are well known in the field of integrated optics. In this application a waveguide about Approximately 1 cm lon used for second-harmonic generation. The diode laser to be used is an InP/Ga(x)In(1- x)As(y)P(1-y)/InP double-heterostructured device. Light from the laser is fed into the waveguide preferably by end-fire coupling, as shown in the figure, but other methods, such as prism or grating couplers, may also be used. The green light generated at...