Abstract

A narrow-linewidth cw $5\mathrm{\mu m}$ source based on difference frequency generation of a $1.3\mathrm{\mu m}$ quantum dot external cavity diode laser and a cw Nd:YAG laser in periodically poled $\mathrm{MgO}:{\mathrm{LiNbO}}_3$ has been developed and evaluated for spectroscopic applications. The source can be tuned to any frequency in the $5.09–5.13\mathrm{\mu m}$ range with an output power up to $0.1\mathrm{mW}$, and in the $5.42–5.48\mathrm{\mu m}$ range with sub-microwatt output. The output frequency is stabilized and its value determined by measuring the frequency of the two lasers with a remotely located frequency comb. A frequency instability of less than $4\mathrm{kHz}$ for long integration times and a linewidth smaller than $700\mathrm{kHz}$ were obtained.

©2012 Optical Society of America

Ti:sapphire laser intracavity difference-frequency generation of 30 mW cw radiation around 4.5μm

I. Galli, S. Bartalini, S. Borri, P. Cancio, G. Giusfredi, D. Mazzotti, and P. De Natale
Opt. Lett. 35(21) 3616-3618 (2010)

10 kHz detection of CO₂ at 4.5 μm by using tunable diode-laser-based difference-frequency generation

Terrence R. Meyer, Sukesh Roy, Thomas N. Anderson, Robert P. Lucht, Rodolfo Barron-Jimenez, and James R. Gord
Opt. Lett. 30(22) 3087-3089 (2005)

Femtosecond 8.5  μm source based on intrapulse difference-frequency generation of 2.1  μm pulses

Ondřej Novák, Peter R. Krogen, Tobias Kroh, Tomáš Mocek, Franz X. Kärtner, and Kyung-Han Hong
Opt. Lett. 43(6) 1335-1338 (2018)

Narrow linewidth single-frequency terahertz source based on difference frequency generation of vertical-external-cavity source-emitting lasers in an external resonance cavity

Justin R. Paul, Maik Scheller, Alexandre Laurain, Abram Young, Stephan W. Koch, and Jerome Moloney
Opt. Lett. 38(18) 3654-3657 (2013)

Widely-tunable mid-infrared frequency comb source based on difference frequency generation

Axel Ruehl, Alessio Gambetta, Ingmar Hartl, Martin E. Fermann, Kjeld S. E. Eikema, and Marco Marangoni
Opt. Lett. 37(12) 2232-2234 (2012)