An average power of 9.0 W at 255 run was obtained from a frequency-doubled copper- vapor laser. The input power was 113 W. The second harmonic was generated in a pair of 5-mm-long BBO crystals in an al- ternating-z configuration. This configuration reduces the dephasing of the SHG interaction due to walkoff. The effect of walkoff was further reduced by using line focusing. An anamorphic telescope produced a line focus about 6.8 mm long and collimated in the critical tuning direction. In the noncritical direction, the line is about 0.15 mm thick and is weakly focused (f/# = 29). Measurements of the harmonic conversion as a function of both peak and average power of the fundamental have been made. The angular tuning characteristics of the alternating-z configuration have been investigated.

© 1994 Optical Society of America

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