Peter G. Schunemann has been a leading researcher in the development of nonlinear optical materials for over 25 years, authoring or co-authoring nearly 250 publications in the field. He received B.S. and M.S. degrees in Materials Science and Engineering from the Massachusetts Institute of Technology in 1984 and 1987 respectively. He joined BAE Systems in 1987, where he has served as principal investigator on numerous of crystal growth development programs to produce improved nonlinear optical crystals for mid-infrared laser applications. In the last decade his emphasis has shifted from melt growth of exotic IR crystals to hydride vapor phase growth of patterned III-V semiconductors. His work on ZnGeP2 in particular, a critical component for the next generation laser-based IRCM systems, earned him a Quarterly Technical Achievement Award in 1992, the Jack L. Bowers Award in 1994 (the company’s highest technical award), and a Nova Award in 1995 (Lockheed Martin’s highest honor for technical excellence), and the Association of Old Crows Technology Hall of Fame award in 2002. He is an OSA Fellow, a member of SPIE and MRS, and is currently the president of AACG (American Association of Crystal Growth).
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Keywords: nonlinear optics, frequency conversion, second harmonic generation
REFERENCES
[1] T. Skauli, K. L. Vodopyanov, T. J. Pinguet, A. Schober, O. Levi, L. A. Eyres, M. M. Fejer, J. S. Harris, B. Gerard, L. Becouarn, and E. Lallier, G. Arisholm, “Measurement of the nonlinear coefficient of orientation-patterned GaAs and demonstration of highly efficient second-harmonic generation”, Optics Letters , Vol. 27, No. 8, 628, (2002)
[2] I. Shoji, T. Kondo, A. Kitamoto, M. Shirane, and R. Ito, “Absolute scale of second-order nonlinear-optical coefficients”, J. Opt. Soc. Am. B, Vol. 14, No. 9, 2268, 1997
We overview recent experimental progress in cascading multiple stages of half-harmonic generation of femtosecond frequency combs starting from a 1-μm pump. We have achieved stable operation with efficiencies as high as ~64%, pulses as short as three optical cycles at 4 μm, and output powers as high as 2.6 W at 2 μm. Our recent numerical and analytical studies of nonlinear dynamics and different operation regimes of femtosecond OPOs indicate a path toward achieving even higher efficiencies and shorter pulses.
Our OPO is pumped by an amplified Tm fiber frequency comb, with phase-locked carrier envelope offset frequency, and repetition rate fixed by phase-locking a frequency comb line to a narrow linewidth diode laser at a telecom channel. The frequency comb is referenced to GPS by long-term stabilization of the repetition rate to a selected value using the temperature of the reference laser as the control. The resulting pump comb is about 3W of 100 fs pulses at 418 MHz repetition rate at 1950 nm. Part of the comb is used for supercontinuum generation for frequency stabilization, and the rest pumps an orientation-patterned gallium arsenide (OP-GaAs) crystal in a doubly-resonant optical parametric oscillator cavity, yielding collinear signal and idler beams from about 3 to 5.5 μm.
We verify comb scanning by resolving the 200 MHz wide absorption lines of the entire fundamental CO vibrational manifold at 11 Torr pressure.
Spectroscopy studies of strain-compensated mid-infrared QCL active regions on misoriented substrates
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