We report a compact, efficient, high-energy, and high-repetition-rate mid-IR picosecond optical parametric oscillator (OPO) based on the new nonlinear material (CSP). The OPO is synchronously pumped by a master oscillator power amplifier system at , providing long macropulses constituting micropulses at , and it can be tuned over across , covering the technologically important wavelength range for surgical applications. Using a compact () cavity and improved, high-quality nonlinear crystal, idler macropulse energy as high as has been obtained at at a photon conversion efficiency of 29.5%, with over more than 68% of the tuning range, for an input macropulse energy of . Both the signal and idler beams are recorded to have good beam quality with a Gaussian spatial profile, and the extracted signal pulses are measured to have durations of . Further, from the experimentally measured transmission data at , we have estimated the two-photon absorption coefficient of CSP to be , with a corresponding energy bandgap, .
© 2011 Optical Society of AmericaFull Article | PDF Article
Andre Peremans, Dan Lis, Francesca Cecchet, Peter G. Schunemann, Kevin T. Zawilski, and Valentin Petrov
Opt. Lett. 34(20) 3053-3055 (2009)
Valentin Petrov, Georgi Marchev, Peter G. Schunemann, Aleksey Tyazhev, Kevin T. Zawilski, and Thomas M. Pollak
Opt. Lett. 35(8) 1230-1232 (2010)
O. Chalus, P. G. Schunemann, K. T. Zawilski, J. Biegert, and M. Ebrahim-Zadeh
Opt. Lett. 35(24) 4142-4144 (2010)