Room-temperature 1.06- to 0.53-um second-harmonic generation in LiNbO3 with 0.6-mol % MgO doping

Bum Ku Rhee; Jong Soo Lee; Gi Tae Joo

doi:10.1117/12.349230

26 May 1999 Room-temperature 1.06- to 0.53-μm second-harmonic generation in LiNbO₃ with 0.6-mol % MgO doping

Bum Ku Rhee, Jong Soo Lee, Gi Tae Joo

Proceedings Volume 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices; (1999) https://doi.org/10.1117/12.349230
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

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.

Citation Download Citation

Bum Ku Rhee, Jong Soo Lee, and Gi Tae Joo "Room-temperature 1.06- to 0.53-μm second-harmonic generation in LiNbO₃ with 0.6-mol % MgO doping", Proc. SPIE 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices, (26 May 1999); https://doi.org/10.1117/12.349230

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