The passive Q-switching regime in a solid state laser with a multiloop cavity

Abstract

A compact, pulsed-periodic YAG: Nd³⁺ laser with self-pumped phase-conjugate multiloop cavity and passive Q-switching by YAG: Cr4+ and GSGG: Cr4+ crystals has been studied. It is established that the energy and temporal parameters of radiation in separate pulses of a periodic train can be controlled almost without changing the pulse train energy. A regime of generating modulated radiation pulses with a peak power of up to 30 MW and a spatial brightness of 1.7 × 10¹⁵ W/(cm² sr) at a radiation beam quality parameter of M² < 1.2 has been realized in experiment.