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Laser-Diode-Pumped Microchip LiNdP 4 O 12 Lasers under Different Pump-Beam Focusing Conditions

1999; Institute of Physics; Volume: 38; Issue: 5A Linguagem: Inglês

10.1143/jjap.38.l515

1347-4065

Yusuke Asakawa, Ryoji KAWAI, Kazuyoshi Ohki, Kenju Otsuka,

Photonic and Optical Devices

Input-output characteristics and multimode oscillation properties have been investigated in laser-diode-pumped microchip LiNdP 4 O 12 lasers under different pump-beam focusing conditions, using microscope objective lenses with varying magnifications. The lasing threshold and slope efficiency, as well as the number of oscillating modes, are shown to depend on the pump-beam radius. The results are explained in terms of the pump-radius-dependent thermal lens effect and the Auger recombination process in high-density pumping regimes.