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Experimental study of the diode pumped alkali laser (DPAL)

2014; SPIE; Volume: 8962; Linguagem: Inglês

10.1117/12.2045391

1996-756X

Masamori Endo, Ryuji Nagaoka, Hiroki Nagaoka, Tatsuzo Nagai, Fumio Wani,

Spectroscopy and Laser Applications

A small-scale cesium diode-pumped alkali laser (DPAL) apparatus has been developed for fundamental researches. A commercial laser diode with volume Bragg grating outcoupler is used to pump the gain cell longitudinally. Both windows of the gain cell are set at Brewster's angle for minimum loss and maximum durability. Output coupling coefficient is continuously variable from 13% to 85% by the slanted quartz plate outcoupler inserted in the optical resonator. Small signal gain is measured with a laser diode probe at various gain cell temperatures. A 6.5 W continuouswave output with 56% optical-to-optical conversion efficiency (based on the absorbed power) has been achieved. A numerical simulation code is developed and its calculation results are in good agreement with the experiments.