A comparative study of a frequency-doubling $532\mathrm{nm}$ laser based on gray-tracking-resistant KTP (GTR-KTP) and conventional KTP is presented. The intracavity GTR-KTP was proved to have better temperature characteristics than that of conventional KTP. Within the normalized output power variation range of 0.8–1.0, GTR-KTP has a temperature tolerance of $35°\mathrm{C}$ , broader than the $21°\mathrm{C}$ obtained with conventional KTP. Under the laser diode (LD) pump power of $180\mathrm{W}$ , the maximum average output power at $532\mathrm{nm}$ was $40.6\mathrm{W}$ for GTR-KTP at a repetition frequency of $10\mathrm{kHz}$ . In the case of conventional KTP, the maximum available LD pump power was limited to $150\mathrm{W}$ , with the corresponding maximum green average output power of $27.2\mathrm{W}$ .

© 2009 Optical Society of America

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