Doubly passively Q-switched intracavity-frequency-doubling <inline-formula><math altimg="none" display="inline" overflow="scroll"><mrow><msup><mi>Nd</mi><mrow><mn>3</mn><mo>+</mo></mrow></msup><mo>:</mo><mi>YAG</mi><mo>∕</mo><mi>KTP</mi></mrow></math></inline-formula> green laser with <inline-formula><math altimg="none" display="inline" overflow="scroll"><mrow><mi>GaAs</mi></mrow></math></inline-formula> and <inline-formula><math altimg="none" display="inline" overflow="scroll"><mrow><msup><mi>Cr</mi><mrow><mn>4</mn><mo>+</mo></mrow></msup><mo>:</mo><mi>YAG</mi></mrow></math></inline-formula> saturable absorbers

Abstract

By using both GaAs and Cr 4+ :YAG saturable absorbers simultaneously in the same cavity, a xenon-flash-lamp-pumped doubly passively Q-switched intracavity-frequency-doubling Nd 3+ :YAG/KTP green laser is realized. This laser can generate a more symmetric shape and shorter pulse width compared to the solely passively Q-switched intracavity-frequency-doubling green laser withCr 4+ :YAG or GaAs saturable absorber. A symmetric factor is defined to describe the temporal symmetry of the pulses quantitatively. The coupled rate equations under the plane-wave approximation are used to simulate the Q-switched process of the laser, and the numerical solutions agree well with the experimental results.