Abstract
Abstract We report a power-scaled operation at π-polarized ~698 nm and σ-polarized ~696 nm deep red lasers in Pr:YLF crystal pumped by a 2-W InGaN LD (laser diode) after a pump beam reshaping. The maximum output power of the π-polarized laser emission at 697.6 nm was up to 348 mW with slope efficiency of about 32.7% in a free-running mode. The σ-polarized laser emission at 695.8 nm was also realized for the first time using a simple and compact Brewster-angle orientated intracavity etalon playing role as birefringence filter and the generated maximum output power of the 695.8 nm laser was up to 116 mW with slope efficiency of about 18.5% with respect to the absorbed pump power.
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