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Proceedings Paper

Room-temperature 1.06- to 0.53-um second-harmonic generation in LiNbO3 with 0.6-mol % MgO doping
Author(s): Bum Ku Rhee; Jong Soo Lee; Gi Tae Joo
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Paper Abstract

Second harmonic generation (SHG) of 532-nm radiation from 1064-nm radiation in LiNbO3 doped with 0.6 mol% MgO has been investigated by using pulsed Nd:YAG lasers whose pulse duration is less than 25 nanoseconds. Efficient and noncritically phase-matched SHG has been achieved at room temperature without any severe photorefractive problem. SHG conversion efficiency of 50% was typically obtained with a 9.5-mm-long crystal and a fundamental peak-power density of 22 MW/cm2 and 0.8 GW/cm2 when the pulse duration of Nd:YAG laser are 25 ns and 40 ps, respectively. It was found that thermal heating due to a linear optical absorption and nonlinear intensity-dependent absorption cause a saturation of conversion efficiency for SHG with nanosecond and picosecond pulses, respectively. It is also observed that photorefraction occurs when the intensity of a fundamental laser is higher than 4 GW/cm2 only for SHG with picosecond pulses. These experimental results show that LiNbO3 doped with 0.6 mol% MgO is one of the best nonlinear optical crystal for an application to SHG with pulsed Nd:YAG lasers.

Paper Details

Date Published: 26 May 1999
PDF: 8 pages
Proc. SPIE 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices, (26 May 1999); doi: 10.1117/12.349230
Show Author Affiliations
Bum Ku Rhee, Sogang Univ. (South Korea)
Jong Soo Lee, Sogang Univ. (South Korea)
Gi Tae Joo, Korea Institute of Science and Technology (South Korea)

Published in SPIE Proceedings Vol. 3610:
Laser Material Crystal Growth and Nonlinear Materials and Devices
Kathleen I. Schaffers; Lawrence E. Myers, Editor(s)

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