LASER FEATURING HIGH QUALITY, STABLE OUTPUT BEAM AND LONG LIFE HIGH CONVERSION EFFICIENCY NON-LINEAR CRYSTAL

摘要

PROBLEM TO BE SOLVED: To provide a mode-locked laser system operable at low temperature.SOLUTION: A laser system comprises; a light source 101; an annealed frequency-conversion crystal 103 having a length approximately equal to a smaller of twice a Rayleigh range in a non-walk-off direction and a length of twice a beam waist radius in a walk-off direction divided by a walk-off angle in radians; a housing 107 configured to maintain an annealed condition of the crystal during standard operation at low temperature; first beam shaping optics configured to receive a beam from the light source and focus the beam to an elliptical cross section at a beam waist in or proximate to the crystal; and a harmonic separation block 105 configured to receive an output from the crystal and generate therefrom the laser beam and at least one undesired frequency beam.SELECTED DRAWING: Figure 1A