Mid-infrared tunable laser based on the Cr:ZnSe active crystal

2008 ◽  
Author(s):  
Petr Koranda ◽  
Helena Jelínková ◽  
Michal Nemec ◽  
Jan Šulc ◽  
Maxim E. Doroshenko ◽  
...  
Keyword(s):  
Tunable Laser ◽  
Mid Infrared ◽  
Active Crystal

scholarly journals Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

2019 ◽  
Vol 9 (2) ◽  
pp. 338 ◽  
Author(s):  
Zhenhui Du ◽  
Shuai Zhang ◽  
Jinyi Li ◽  
Nan Gao ◽  
Kebin Tong
Keyword(s):  
Absorption Spectroscopy ◽  
Gas Sensing ◽  
Tunable Laser ◽  
Gas Detection ◽  
Trace Gas ◽  
Spectroscopic Techniques ◽  
Trace Gas Detection ◽  
Absorption Bands ◽  
Mid Infrared ◽  
Broadband Absorption

The vast majority of gaseous chemical substances exhibit fundamental rovibrational absorption bands in the mid-infrared spectral region (2.5–25 μm), and the absorption of light by these fundamental bands provides a nearly universal means for their detection. A main feature of optical techniques is the non-intrusive in situ detection of trace gases. We reviewed primarily mid-infrared tunable laser-based broadband absorption spectroscopy for trace gas detection, focusing on 2008–2018. The scope of this paper is to discuss recent developments of system configuration, tunable lasers, detectors, broadband spectroscopic techniques, and their applications for sensitive, selective, and quantitative trace gas detection.

LESS-INVASIVE LASER THERAPY AND DIAGNOSIS USING A TABLETOP MID-INFRARED TUNABLE LASER

2010 ◽  
Vol 03 (04) ◽  
pp. 285-292 ◽  
Author(s):  
HISANAO HAZAMA ◽  
KATSUNORI ISHII ◽  
KUNIO AWAZU
Keyword(s):  
Atherosclerotic Lesion ◽  
Wavelength Region ◽  
Tunable Laser ◽  
High Energy ◽  
Attenuated Total Reflection ◽  
Absorption Lines ◽  
Mid Infrared ◽  
Characteristic Absorption ◽  
Less Invasive ◽  
Non Destructive

Since numerous characteristic absorption lines caused by molecular vibration exist in the mid-infrared (MIR) wavelength region, selective excitation or selective dissociation of molecules is possible by tuning the laser wavelength to the characteristic absorption lines of target molecules. By applying this feature to the medical fields, less-invasive treatment and non-destructive diagnosis with absorption spectroscopy are possible using tunable MIR lasers. A high-energy nanosecond pulsed MIR tunable laser was obtained with difference-frequency generation (DFG) between a Nd:YAG and a tunable Cr:forsterite lasers. The MIR-DFG laser was tunable in a wavelength range of 5.5–10 μm and generated laser pulses with energy of up to 1.4 mJ, a pulse width of 5 ns, and a pulse repetition rate of 10 Hz. Selective removal of atherosclerotic lesion was successfully demonstrated with the MIR-DFG laser tuned at a wavelength of 5.75 μm, which corresponds to the characteristic absorption of the ester bond in cholesterol esters in the atherosclerotic lesions. We have developed a non-destructive diagnostic probe with an attenuated total reflection (ATR) prism and two hollow optical fibers. An absorption spectrum of cholesterol was measured with the ATR probe by scanning the wavelength of the MIR-DFG laser, and the spectrum was in good agreement with that measured with a commercial Fourier transform infrared spectrometer.

MID-INFRARED TUNABLE LASER ENVIRONMENTAL TRACER SPECIES MEASUREMENT

1996 ◽  
Vol 7 (9) ◽  
pp. 34
Author(s):  
C. E. KOLB ◽  
J. B. McMANUS ◽  
D. D. NELSON ◽  
J. C. WORMHOUDT ◽  
M. S. ZAHNISER
Keyword(s):  
Tunable Laser ◽  
Environmental Tracer ◽  
Mid Infrared

scholarly journals Sensitivity Advantage of QCL Tunable-Laser Mid-Infrared Spectroscopy Over FTIR Spectroscopy

2015 ◽  
Vol 50 (10) ◽  
pp. 822-839 ◽  
Author(s):  
David T. D. Childs ◽  
Richard A. Hogg ◽  
Dmitry G. Revin ◽  
Ihtseham Ur Rehman ◽  
John W. Cockburn ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Ftir Spectroscopy ◽  
Tunable Laser ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy
Sign in / Sign up

Export Citation Format

Share Document