| 摘要 |
A laser light source apparatus and a control method for automatically sitting the temperature of a KTP crystal to an optimal temperature, and to follow up in variations of the optimal temperature. A predetermined temperature step is periodically added to a temperature corresponding to a reference potential, the addition of the temperature step is stopped when a temperature at which the UV laser output is substantially maximized, and a temperature step smaller than the temperature step DELTA T is successively subtracted from the temperature Tc, thereby automatically setting the KTP crystal temperature to the optimal temperature. Also, the difference between the two values of the UV laser output before and after each step addition of the temperature step is calculated and step subtraction is started when the difference becomes reversed in polarity, thus controlling the KTP crystal temperature so that the UV laser output is always maintained at the maximum. Therefore, the control system can follow up a variation in the optimal temperature due to a change in temperature characteristic of the KTP crystal.
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