Onyx Optics, Inc.

Da Li

Helmuth E Meissner

Huai-Chuan Lee

David Joseph Meissner

Stephanie K Meissner

A nonlinear optical crystal (NLO) with a phase matching angle that is corrected with a source laser beam for harmonic conversion. The source laser only has to be within a wavelength range depending on the dispersion of the crystal while the crystal is tilted to the calculated expected conversion angle of the source laser as reference. The angle correction is accomplished with a parallel kinematic motion device to which a nonlinear crystal is mounted on a platform, to determine the wavelength- and temperature-specific angle with active laser alignment and subsequent precision resurfacing. The invented phase matching angle correction is applicable to any uniaxial and biaxial NLO crystals in a wide range of wavelengths, e.g., from far ultraviolet to visible to far infrared. It is of most value for NLO crystals of large walk-off and is applicable to any prior art frequency converting architectures.

Nonlinear optical crystal with corrected phase matching angle

A laser or nonlinear optical waveguide is presented that is formed from a core anisotropic crystal sandwiched by a cladding of anisotropic crystals of the same material but slightly rotated optical axes. The core and cladding crystals can be cut from the same crystal boule and bonded without adhesives between them. Because the crystals are anisotropic, the core and slightly skewed cladding crystals exhibit different refractive indexes to a propagating light beam. The difference in refractive indexes should be &#x2265;1.2&#xd7;10for mode confinement and 2d/&#x3bb;*Sqrt(n&#x2212;n)&#x2264;1.37 to achieve single mode operation in a square cross section, &#x2264;1 for a planar cross section. Alternative embodiments use slightly different doping amounts in crystals to achieve the difference in refractive indexes between the core and cladding.

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San Ramon, CA, United States of America

Da Li