Multi-crystal frequency tripler for third harmonic conversion

A method of generating frequency converted light, the method comprising:

• providing an input beam characterized by a fundamental wavelength;
• frequency converting a portion of the input beam to a doubled beam characterized by a doubled wavelength half the fundamental wavelength, wherein frequency converting the input beam comprises transmitting the input beam through a first plurality of non-linear optical crystals and outputting the doubled beam and another portion of the input beam;
• and
• frequency converting the doubled beam and the another portion of the input beam to a tripled beam characterized by a tripled wavelength two thirds the doubled wavelength, wherein frequency converting the doubled beam and the remaining portion of the input beam comprises transmitting the doubled beam light and the remaining portion of the input beam through a second plurality of non-linear optical crystals and outputting the tripled beam.

An optical system comprising:

• a laser source operable to output a laser beam at a fundamental wavelength;
• a frequency conversion system including:
• a frequency doubler module including a first plurality of nonlinear optical crystals;
• and
• a frequency tripler module including a second plurality of nonlinear optical crystals;
• a control system coupled to the frequency conversion system;
• and
• a diagnostics system coupled to the frequency conversion system.