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MO: Fachverband Molekülphysik
MO 14: Vibrational and Rotational Spectroscopy
MO 14.6: Vortrag
Mittwoch, 11. März 2020, 15:45–16:00, f142
Wide range, high resolution M-IR spectroscopy of C2H2 — •Ulrich Eismann1, David B. Foote2, Matt Cich2, Walter Hurlbut2, Daniel J. Christensen3, Felix Rohde1, and Chris Haimberger2 — 1TOPTICA Photonics AG, Lochhamer Schlag 19, D-82166 Graefelfing, Germany — 2TOPTICA Photonics, Inc., 5847 County Rd. 41, Farmington, NY 14425, USA — 3now with Lumencor Inc., 14940 NW Greenbrier Parkway, Beaverton, OR 97006 USA
Continuous-wave optical parametric oscillators are a flexible tool for high-resolution spectroscopy, potentially covering from the D-UV to the M-IR range, with tunable narrow-linewidth output powers exceeding 10 W and versatile frequency referencing.
Here, we demonstrate more than 50 nm of automatic, effectively-mode-hop-free idler tuning of our commercial source DLC TOPO by using stand-off digital control. We achieve an absolute accuracy in the low 10−3 cm−1 range (≈ 100 MHz) at a scan speed of 2 cm−1/min. We present continuous spectroscopy on C2H2 and CH4 near 3 µm . The M-IR frequency referencing is established by monitoring the pump and signal wavelengths in the N-IR using a wavelength meter, and our data suggests an improvement of the HITRAN database.
Our scheme can be extended to fully automatic operation within the entire 2.2 – 4.0 µm idler emission range. For demonstration, we obtain similar performance at the minimum and maximum idler wavelengths. Using a frequency frequency comb as a reference, ultimate accuracies can be achieved, and we demonstrate measurements of the DLC TOPO locked to a commercial comb system DFC CORE.