We demonstrate a cw, diode-pumped-Nd:YVO<sub>4</sub> laser oscillator in a self-starting, adaptive loop configuration producing 20 W of phase-conjugate output for 66 W of diode pumping. The beam quality is TEM<sub>00</sub> with a beam quality factor M<sup>2</sup>≃1.1 despite strong thermally-induced lensing in the amplifier. An additional amplifier was introduced inside the adaptive oscillator, scaling the power to 33 W of phase-conjugate output with a total diode-pumping power of 103 W. A discussion is presented of the cavity stability and optimization of the phase-conjugation efficiency, including the use of relay-imaging optics.
© 2003 Optical Society of America
(090.1000) Holography : Aberration compensation
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3530) Lasers and laser optics : Lasers, neodymium
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.5040) Nonlinear optics : Phase conjugation
Benjamin A. Thompson, Ara Minassian, and Michael J. Damzen, "Operation of a 33-W, continuous-wave, self-adaptive, solid-state laser oscillator," J. Opt. Soc. Am. B 20, 857-862 (2003)