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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.
English (United States)
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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)
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