Nonlinear crystal modifications for durable high-power laser wavelength conversion

摘要

A wavelength converter (34) such as a nonlinear crystal has an angle cut exit surface (36) to separate a harmonic wavelength from a fundamental or different harmonic wavelength. A solid optical overlay medium (28) has an entrance surface (38) that is angle cut to mate with the converter exit surface (36). The optical overlay medium (28) is substantially transparent to the fundamental and selected harmonic wavelengths, has a refractive index similar to that of the wavelength converter (34), and has damage thresholds at the selected wavelengths that are greater than the respective damage thresholds of the wavelength converter (34).