Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 40: Laser Development: Nonlinear Effects
Q 40.1: Vortrag
Mittwoch, 25. März 2015, 11:00–11:15, K/HS2
Record power levels in the mid-IR around 7 µm with a femtosecond OPO at 86 MHz — •Joachim Krauth1, Suddapalli Chaitanya Kumar2, Tobias Steinle1, Andy Steinmann1, Peter G. Schunemann3, Kevin T. Zawilski3, Majid Ebrahim-Zadeh2, and Harald Gießen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart — 2ICFO, Barcelona, Spain — 3BAE Systems, Inc., Nashua, New Hampshire, USA
We demonstrate a high-power, mid-infrared, femtosecond optical parametric oscillator (OPO) based on Cadmium Silicon Phosphide, CdSiP2 (CSP) nonlinear crystal generating up to a record output power of 115 mW in the idler at wavelengths as long as 7 µm along with 480 mW of signal at 1209 nm. The OPO is configured as a singly resonant oscillator in an X-cavity design to operate at 86 MHz while it is synchronously pump by a Yb:KGW laser, providing up to 5 W of output power with 500 fs pulses at 43 MHz and operating at a central wavelength of 1029 nm. The generated signal and mid-infrared idler exhibit large spectral bandwidths of 9 and 310 nm, respectively. The signal pulses are measured to have pulse duration of 500 fs considering a sech2 pulse shape. This stable, high power, mid-infrared OPO is useful for various applications including mid-infrared spectroscopy. A complete characterization of the OPO along with power scaling, stability and mid-infrared idler spectral measurements will be presented. We envision applications such as medical and vibration spectroscopy, neurosurgery, as well as detection of TNT and other chemical or biological materials with vibrational fingerprints in the 7 µm region.