Third harmonic laser system

A third harmonic laser system, comprising:

• a fundamental wave resonator which comprises a first laser active medium generating at least a fundamental laser beam from a front end mirror thereof, wherein said fundamental laser beam has a fundamental wavelength;
• a second harmonic laser generator, which is optically communicated with said fundamental wave resonator, comprising:
• a first polarizing mirror, which is reflective to said fundamental laser beam, being in optical communication with said fundamental wave resonator and orientated in such a manner that when said fundamental laser beam generated by said fundamental wave resonator strikes on said first polarizing mirror at a predetermined angle, said fundamental laser beam is vertically polarized and reflected;
• a dual wavelength waveplate, which is capable of converting horizontally polarized laser beam into vertically polarized laser beam;
• and
• a first type-I nonlinear crystal optically communicating said first polarizing mirror with said dual wavelength waveplate and converting said fundamental laser beam which is vertically polarized and reflected from said first polarizing mirror into a horizontally polarized second harmonic laser beam having a second harmonic wavelength which is half of said fundamental wavelength while allowing a first unconverted portion of said fundamental laser beam to pass through;
• and
• a third harmonic laser generator, which is in optical communication with said second harmonic modifier, comprising:
• a second type-I nonlinear crystal mixing and converting a predetermined portion of said fundamental laser beam and said second harmonic laser beam into a horizontally polarized third harmonic laser beam having a third harmonic wavelength which is one-third of said fundamental wavelength, while allowing a second unconverted portion of said fundamental laser beam and said second harmonic laser beam to pass through, wherein said second harmonic laser has a property of horizontal linear polarization;
• a second polarizing mirror, which is anti-reflective to said third harmonic laser beam and reflective to said second harmonic laser beam and said fundamental laser beam, optically communicating said second type-I nonlinear crystal with said dual wavelength waveplate so as to reflect said second harmonic laser beam and said fundamental laser beam to said second harmonic laser generator;
• and
• a third harmonic laser end mirror, which is reflective to said fundamental laser beam, said second harmonic laser beam and said third harmonic laser beam, being optically communicated with said second type-I nonlinear crystal to reflect said fundamental laser beam, said second harmonic laser beam and said third harmonic laser beam to said second polarizing mirror via said second type-I nonlinear crystal, wherein said third harmonic laser beam is outputted by passing through said second polarizing mirror.