Abstract
Periodical switching laser pulses with nanosecond pulsewidth and several kilowatts peak power from wide-separatedmultilongitudinal-mode oscillation were observed experimentally inlaser-diode pumped passively Q-switched Yb:YAG microchip laserwith Cr4+:YAG as saturable absorber. Pulses from differentlongitudinal modes oscillate alternatively. Periodical pulsesoscillation dynamics induced by spatial hole burning effect andmode competition was investigated numerically by the evolution ofthe inversion population of different modes and the bleaching andrecovery of the inversion population of the saturable absorber.The numerical simulations of switchable periodical pulsation ofmultilongitudinal-mode passively Q-switched Yb:YAG/Cr4+:YAGmicrochip lasers are in good agreement with experimental resultsand confirmed that such pulsations are an intrinsic property inpassively Q-switched Yb:YAG/Cr4+:YAG microchip lasers.
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