Abstract

We describe the use of a pulsed external-cavity quantum-cascade laser (EC-QCL) for the acquisition of mid-IR photoacoustic (PA) spectra of solids. The EC-QCL employed in this work operates from $990\text{to}1075{\mathrm{cm}}^{-1}$ $(9.30–10.10\mu \mathrm{m})$. A gas-microphone PA cell was used as the detector, and the signal was demodulated using a lock-in amplifier. PA EC-QCL spectra of solids display bands significantly narrower than those in corresponding PA Fourier transform infrared spectra.

© 2008 Optical Society of America

Fully reflective external-cavity setup for quantum-cascade lasers as a local oscillator in mid-infrared wavelength heterodyne spectroscopy

Dušan Stupar, Jürgen Krieg, Peter Krötz, Guido Sonnabend, Manuela Sornig, Thomas F. Giesen, and Rudolf Schieder
Appl. Opt. 47(16) 2993-2997 (2008)

Mid-infrared external-cavity quantum-cascade laser

G. Totschnig, F. Winter, V. Pustogov, J. Faist, and A. Müller
Opt. Lett. 27(20) 1788-1790 (2002)

External cavity quantum cascade laser for quartz tuning fork photoacoustic spectroscopy of broad absorption features

Mark C. Phillips, Tanya L. Myers, Michael D. Wojcik, and Bret D. Cannon
Opt. Lett. 32(9) 1177-1179 (2007)

Infrared hyperspectral imaging using a broadly tunable external cavity quantum cascade laser and microbolometer focal plane array

Mark C. Phillips and Nicolas Hô
Opt. Express 16(3) 1836-1845 (2008)

Cavity ringdown spectroscopy using mid-infrared quantum-cascade lasers

B. A. Paldus, C. C. Harb, T. G. Spence, R. N. Zare, C. Gmachl, F. Capasso, D. L. Sivco, J. N. Baillargeon, A. L. Hutchinson, and A. Y. Cho
Opt. Lett. 25(9) 666-668 (2000)