Hannover 2020 – wissenschaftliches Programm
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Q 37.1: Vortrag
Mittwoch, 11. März 2020, 14:00–14:15, f435
Millisecond wavelength tuning across hundreds of nanometers of a fiber optical parametric oscillator — •Tim Hellwig1,2, Maximilian Brinkmann1,2, and Carsten Fallnich1 — 1Institute of Applied Physics, University of Münster, Germany — 2Refined Laser Systems GmbH, Münster, Germany
We present a mechanical delay-free tuning concept for optical parametric oscillators (OPO) removing the main barrier for high-speed switching between arbitrary wavelengths. The concept is based on dispersive matching of the repetition frequency change occurring during wavelength tuning of a pump laser to the associated change of repetition frequency in the OPO. We present a fiber-based optical parametric oscillator (FOPO), which is all electronically tunable within 5 ms. The FOPO was built from all-spliced components and the parametric gain was supplied by 50 cm of photonic-crystal fiber. The signal was all-electronically tunable from 780 to 970 nm with the corresponding idler wavelengths of 1150 to 1500 nm. For a conventional OPO this change in wavelength would be associated with a necessary mechanical delay of about 2 cm leading to the typical tuning times of at least several seconds. A second output provided access to 500 mW of pump pulse power usable for pump and probe experiments. With output powers of up to 200 mW for the signal wave, matching pulse durations of all outputs of 7 ps at 40 MHz and with excitation bandwidths of <12 cm-1 the presented system shows ideal performance, e.g., for efficient coherent Raman imaging.