Power-scalable nonlinear optical wavelength converter

A method comprising:

• generating a laser beam;
• directing the laser beam at a nonlinear crystal configured for wavelength conversion, wherein the nonlinear crystal is positioned such that a focus of the laser beam is outside the nonlinear crystal in at least one plane perpendicular to a beam propagation direction of the laser beam, wherein the nonlinear crystal is disposed on a crystal mount assembly, wherein the crystal mount assembly provides an angle stability of greater than 0% and less than or equal to 27% of an angular acceptance range during operation, wherein the crystal mount assembly includes a plurality of mounting features at different distances from a laser source in the beam propagation direction, wherein each of the mounting features includes a hole that the crystal mount assembly is fastened into, and wherein a beam size of the laser beam in the nonlinear crystal is provided by selecting one of the mounting features;
• and
• nonlinearly converting the laser beam from a first wavelength to a second wavelength with the nonlinear crystal.