Threshold for strong thermal dephasing in periodically poled KTP in external cavity frequency doubling |
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Authors: | J H Lundeman O B Jensen P E Andersen and P M Petersen |
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Institution: | (1) DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark |
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Abstract: | 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 1.41×1010 W2 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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Keywords: | PACS" target="_blank">PACS 42 55 Px 42 65 Ky 42 65 Pc 42 70 Mp |
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