Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 7: Laser Development and Applications (joint session Q/A)
A 7.3: Vortrag
Montag, 5. März 2018, 14:30–14:45, K 0.023
Ultra Compact High-Harmonic Cavity Optical Parametric Oscillator for Optical Amplifier Seeding — •Marco Nägele1, Florian Mörz1, Heiko Linnenbank1, Tobias Steinle2, Andy Steinmann1, and Harald Giessen1 — 14th Physics Institute, University of Stuttgart, Germany — 2ICFO, Barcelona, Spain
We present a master oscillator power amplifier (MOPA) scheme, based on a high-harmonic cavity optical parametric oscillator (OPO), emitting tunable light in the near infrared region. Different from conventional OPOs and our previous fiber-feedback OPO, the high-harmonic OPO cavity uses only a fraction of the fundamental conventional OPO cavity length, thus supporting the 15th harmonic and offering a very compact design. Additionally, low pump power values provide high suitability for post-amplification of the OPO output, since the remaining pump power is available for an optical parametric amplifier (OPA). We recorded a pump power threshold between 30-100 mW over the entire OPO tuning range from 2.3-4.1 µm. A high versatility of different pump laser sources with MHz repetition rate is suitable by using the high-harmonic cavity design and direct idler outcoupling. As the signal pulse remains inside the cavity, the ejected idler pulses match the pump laser in repetition rate, pulse duration, and shape. While we use a 450 fs pulsed solid-state pump laser at 1030 nm and 41 MHz, different repetition rate pump sources are usable by several cm cavity length adjustment in order to match a higher pump harmonic. Post amplification of the ejected idler using an (OPA) additionally generates tunable signal light between 1.4-2 µm.