Second-Harmonic Generation of GaAlAs Diode Laser by Enhanced Doubling in LiIO3 Crystal

The second harmonic of the 794 nm output of a GaAlAs diode laser is generated in a LiIO 3 crystal in an external ring enhancement cavity. The dependence of the second-harmonic power on the input power has been measured and compared with the theory. The second-harmonic power of 7.4 µ W at 397 nm has been obtained with an input fundamental power of 28 mW by using an 8-mm-long LiIO 3 crystal.