To scale the output power of a continuous wave Nd:GdVO 4 laser at 1342 nm of a singlelongitudinal-mode operation, a composite Nd:GdVO 4 laser rod was employed and the cross section dimensions parameter of a laser crystal was optimized, the maximum single-frequency output power was 4.6 W. The stability of output power was better than ±1% in the given two hours.

A diode-end-pumped continuous-wave single-longitudinal-mode intracavity frequencydoubling Nd:GdVO 4 -LBO (lithium triborate) red laser at 670 nm is reported. A ring cavity was designed to enable single-longitudinal-mode operation of the laser. By optimizing the mode-to-pump ratio taking account of the influence of the laser beam radius inside the frequency-doubling crystal LBO on the frequency-doubling efficiency for the special cavity, a maximum output power of 1.3 W for a continuous-wave single-longitudinal-mode red laser at 670 nm was obtained, and the measured power stability was better than ±1.2% in 2 h. The experimental results are in good agreement with the theoretical calculation.