Diode-Side-Pumped Q-Switched Intracavity Frequency-Doubled Nd:Gd₃Ga₅O₁₂/LiB₃O₅ Laser at 555 nm

Abstract

A frequency-doubled laser emitting at 555 nm within a diode-side-pumped acousto optically Q-switched Nd:Gd3Ga5O12 laser is demonstrated for the first time. A simple straight cavity scheme is employed to achieve a compact configuration and all the coatings are specially designed. A 25.5 W 1110 nm laser continuous wave output is achieved under the incident pump power of 168 W. A LiB3O5 crystal is used for second-harmonic generation of the laser. When the pump power is 168 W, the average output power at 555 nm of 6.6 W is obtained, corresponding to the optical conversion efficiency of 3.9%. The minimum pulse width (FWHM) is 176 ns with the pulse repetition rate of 10 kHz. The M 2 factors are measured to be 19.6 and 21.3 in the horizontal and vertical directions, respectively.