Abstract

We demonstrate a system for the active real-time hyperspectral imaging of gases using a combination of a compact, pump-enhanced, continuous-wave optical parametric oscillator as an all-solid-state mid-infrared source of coherent radiation and an electro-mechanical polygonal imager. The wide spectral coverage and high spectral resolution characteristics of this source means that the system is capable of being selectively tuned into the absorption features of a wide variety of gaseous species. As an example we show how the largest absorption coefficient exhibited by methane at 3057.7cm-1 can be accessed (amongst others) and gas plumes imaged in concentrations as low as 30ppm.m using a parametric oscillator based on periodically-poled RbTiOAsO4 (PP-RTA).

© 2004 Optical Society of America

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References

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Appl. Opt.

Appl. Phys. B

A. Popp, F. Muller, S. Schiller, G. v. Basum, H. Dahnke, P. Hering, M. Murtz, and F. Kuhnemann, ???Ultrasensitive mid-infrared cavity leak-out spectroscopy using a cw optical parametric oscillator,??? Appl. Phys. B 75, 751-54 (2002).
[CrossRef]

F. Kuhnemann, K. Schneider, A. Hecker, A. A. E. Martis, W. Urban, S. Schiller and J. Mlynek, ???Photoacoustic trace gas detection using a cw single-frequency optical parametric oscillator,??? Appl. Phys. B 66, 741-45 (1998).
[CrossRef]

T. J. Kulp, S. E. Bison, R. P. Bambha, T. A. Reichardt, U. -B. Goers, K. W. Aniolek, D. A. V. Kliner, B. A. Richman, K. M. Armstrong, R. Sommers, R. Schmitt, P. E. Powers, O. Levi, T. Pinguet, M. Fejer, J. P. Koplow, L. Goldberg and T. G. McRae, ???The application of quasi-phase-matched parametric light sources to practical infrared chemical sensing systems,??? Appl. Phys. B 75, 317-27 (2002).
[CrossRef]

J. Opt. Soc. Am. B

Opt. Express

Opt. Lett.

L. E. Myers, R. C. Eckardt, M. M. Fejer, R. L. Byer and J. W. Pierce, ???Multigrating quasi-phase-matched optical parametric oscillator in periodically poled LiNbO3,??? Opt. Lett. 21, 591-3 (1996).
[CrossRef] [PubMed]

W. R. Bosenberg, A. Drobshoff, J. I. Alexander, L. E. Myers and R. L. Byer, ???Continuous-wave singly resonant optical parametric oscillator based on periodically poled LiNbO3,??? Opt. Lett. 21, 713-15 (1996).
[CrossRef] [PubMed]

W. R. Bosenberg, A. Drobshoff, J. I. Alexander, L. E. Myers and R. L. Byer, ???93% pump depletion, 3.5W continuous-wave, singly resonant optical parametric oscillator,??? Opt. Lett. 21, 1336-38 (1996).
[CrossRef] [PubMed]

E. V. Kovalchuk, D. Dekorsy, A. I. Lvovsky, C. Braxmaier, J. Mlynek, A. Peters and S. Schiller, ???High-resolution Doppler-free molecular spectroscopy with a continuous-wave optical parametric oscillator,??? Opt. Lett. 26, 1430-32 (2001).
[CrossRef]

F. Hanson, P. Poirier and M. A. Arbore, ???Single-frequency mid-infrared optical parametric oscillator source for coherent laser radar,??? Opt. Lett. 26, 1794-96 (2001).
[CrossRef]

M. Scheidt, B. Beier, K.-J. Boller and R. Wallenstein, ???Frequency-stable operation of a diode-pumped continuous-wave RbTiOAsO4 optical parametric oscillator,??? Opt. Lett. 22, 1287-89 (1997).
[CrossRef]

K. Schneider, P. Kramper, S. Schiller and J. Mlynek, ???Toward an optical synthesizer: a single-frequency parametric oscillator using periodically poled LiNbO3,??? Opt. Lett. 22, 1293-95 (1997).
[CrossRef]

M. E. Klein, D.-H. Lee, J.-P. Meyn, K.-J. Boller and R. Wallenstein, ???Singly resonant, continuous-wave optical parametric oscillator pumped by a diode laser,??? Opt. Lett. 24, 1142-4 (1999).
[CrossRef]

G. Robertson, M. J. Padgett, and M. H. Dunn, ???Continuous-wave singly resonant pump-enhanced type II LiB3O5 optical parametric oscillator,??? Opt. Lett. 19, 1735-37 (1994).
[CrossRef] [PubMed]

OSA Handbook of Optics IV

M. Ebrahimzadeh and M. H. Dunn, ???Optical Parametric Oscillators,??? OSA Handbook of Optics IV 22.1-22.65 (2001).

Other

HITRAN data base, URL: <a href="http://cfa-www.harvard.edu/HITRAN/">http://cfa-www.harvard.edu/HITRAN/</a>.

Supplementary Material (2)

» Media 1: MOV (457 KB)     
» Media 2: MOV (1027 KB)     

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Figures (6)

Fig. 1.
Fig. 1.

Pump Enhanced Optical Parametric Oscillator

Fig. 2.
Fig. 2.

OPO Tuning Behaviour. The shaded area represents the pressure-broadened absorption feature of methane at 3057.69cm-1

Fig. 3.
Fig. 3.

Polygonal Scanner

Fig. 4.
Fig. 4.

Image of a methane plume acquired at an idler wavelength of 3.27µm (3057.7cm-1)

Fig. 5.
Fig. 5.

Snaphot of accompanying video clips. The colour video (457kB) was shot under normal lighting conditions with a standard camera. The black and white clip (1MB) was captured with the gas imaging system at 3.35µm: the emerging methane plume is clearly visible. The video files are in Quick-time (*.MOV) format

Fig. 6.
Fig. 6.

Image enhancement by differential absorption. Figures 6(a) and 6(b) show images captured with the OPO idler frequency both on and off resonance with the methane absorption feature. The difference between these images (i.e., the methane plume) is shown in Fig. 6(c). Finally, false colour is applied to Fig. 6(c) which is then superimposed upon Fig. 6(b) to generate Fig. 6(d).

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