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Proceedings Article

Multiwatt KTiOPO4 optical parametric oscillators pumped within randomly and linearly polarized Nd:YAG laser cavities

[+] Author Affiliations
Kin Seng Lai, Ruifen Wu

DSO National Labs. (Singapore)

Poh-Boon Phua

DSO National Labs. (USA)

Proc. SPIE 3928, Nonlinear Materials, Devices, and Applications, 43 (March 23, 2000); doi:10.1117/12.379928
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From Conference Volume 3928

  • Nonlinear Materials, Devices, and Applications
  • Jeffrey W. Pierce
  • San Jose, CA | January 22, 2000

abstract

We present 2 experiments on intracavity pumping of a KTiOPO4 (KTP) optical parametric oscillator (OPO) within a high power 1064nm Nd:YAG laser cavity producing multiwatt level 2-micron outputs. In such high power regime, the Nd:YAG rod laser suffers significant thermally-induced birefringence loss when it is linearly polarized. Hence in the first experiment, we present our intracavity KTP OPO pumped within the simple cavity of an unpolarized Nd:YAG laser. This simple configuration, with 1-micron high reflectors forming the Nd:YAG laser cavity and R equals 75 percent and 100 percent 2-micron mirrors forming the short flat-flat OPO cavity, delivered 6.5W of 2-micron output power at 3kHz Q-switched operation. Next we pumped our intracavity OPO within a more complex polarized Nd:YAG laser cavity. In this second experiment, we compensated for the thermally-induced birefringence loss in the Nd:YAG laser by using a re-entrant laser cavity with a Faraday rotator, and the OPO was pumped within one arm of this set-up. In this case, we also obtained approximately 6.5W of 2-micron output. FInally, studies of the temporal profiles of the 1 and 2-micron laser beams also revealed interesting multiple pulse features in such intracavity OPO output.

© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Kin Seng Lai ; Ruifen Wu and Poh-Boon Phua
"Multiwatt KTiOPO4 optical parametric oscillators pumped within randomly and linearly polarized Nd:YAG laser cavities", Proc. SPIE 3928, Nonlinear Materials, Devices, and Applications, 43 (March 23, 2000); doi:10.1117/12.379928; http://dx.doi.org/10.1117/12.379928


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