Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 96, Issue 4, Pages 827-831Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-009-3678-6
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Funding
- Danish Research Agency FTP [26-02-0020]
- EU [IST-2005-035266]
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We present a measurement series of the efficiency of periodically poled KTP used for second-harmonic generation in an external phase-locked cavity. Due to the high absorption (0.01 cm(-1)) in the PPKTP crystal at the pump wavelength a strong thermal dephasing of the periodically poled grating is observed for high pump powers. For four different resonator setups, it was experimentally found that a threshold parameter could be defined as the ratio between the focal intensity in the crystal and the single-pass conversion efficiency. The value of this threshold for the onset of strong thermal dephasing was found to be 1.41x10(10) W-2 m(-2) in our 30-mm long PPKTP sample. This threshold parameter marks the onset of thermally induced instability that leads to a degradation of the SHG conversion efficiency. Above the threshold the shape of the resonance peaks of the resonator changed from symmetrical into triangular making phase locking difficult.
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