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    • 5. 发明授权
    • Miniature blue-green laser source using second-harmonic generation
    • 微型蓝绿激光源采用二次谐波发生
    • US5060233A
    • 1991-10-22
    • US570251
    • 1990-08-17
    • Christoph S. HarderWilfried LenthHeinz P. MeierWilliam P. Risk
    • Christoph S. HarderWilfried LenthHeinz P. MeierWilliam P. Risk
    • G02F1/35G02F1/37H01S5/0687H01S5/40
    • G02F1/37H01S5/0687G02F2001/3542H01S5/4025
    • Apparatus and method for producing coherent blue-green-light radiation having a wavelength of essentially 490-500 nm. A diode laser, such as a strained-layer InGaAs/GaAs diode laser, provides a 980-1,000 nm beam, and a nonlinear crystal of KTP produces coherent radiation by noncritically phase-matched second-harmonic generation (SHG) of said beam. The beam preferably has a wavelength of essentially 994 nm for generating radiation having a wavelength of essentially 497 nm. The crystal is disposed within an optical resonator and the frequency of the laser is locked to that of the resonator. Alternatively, two diode lasers are oriented to provide orthogonally polarized beams each with a wavelength of 980-1,000 nm but within essentially 1 nm of each other, and the KTP crystal is oriented with its a- and c-axis parallel to the orthogonally polarized beams. The KTP crystal may have an associated optical waveguide along which the beam is propagated to enhance SHG efficiency.
    • 用于产生波长基本为490-500nm的相干蓝 - 绿光辐射的装置和方法。 诸如应变层InGaAs / GaAs二极管激光器的二极管激光器提供980-1,000nm的光束,并且KTP的非线性晶体通过所述光束的非相位相位二次谐波产生(SHG)产生相干辐射。 光束优选地具有基本上为994nm的波长,用于产生波长基本上为497nm的辐射。 晶体设置在光学谐振器内,并且激光器的频率被锁定到谐振器的频率。 或者,两个二极管激光器被定向以提供各自具有980-1,000nm的波长但在彼此基本上1nm内的正交偏振光束,并且KTP晶体被取向为其a轴和c轴平行于正交偏振光束 。 KTP晶体可以具有相关联的光波导,沿着该光波导传播光束以增强SHG效率。