Chemical problems of high-power sealed-off carbon monoxide lasers

1991 ◽  
Author(s):  
Vladislav S. Alejnikov ◽  
Victor I. Masychev ◽  
V. V. Karpetscki
Keyword(s):  
Carbon Monoxide ◽  
High Power ◽  
Carbon Monoxide Lasers

Measurements of carbon monoxide mixing ratios in Houston using a compact high-power CW DFB-QCL-based QEPAS sensor

2014 ◽  
Vol 117 (2) ◽  
pp. 519-526 ◽  
Author(s):  
Przemysław Stefański ◽  
Rafał Lewicki ◽  
Nancy P. Sanchez ◽  
Jan Tarka ◽  
Robert J. Griffin ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
High Power ◽  
Mixing Ratios ◽  
Qepas Sensor

Area scaling in slab rf‐excited carbon monoxide lasers

1991 ◽  
Vol 59 (11) ◽  
pp. 1281-1283 ◽  
Author(s):  
H. Zhao ◽  
H. J. Baker ◽  
D. R. Hall
Keyword(s):  
Carbon Monoxide ◽  
Carbon Monoxide Lasers

scholarly journals A Sensitive Carbon Monoxide Sensor Based on Photoacoustic Spectroscopy with a 2.3 μm Mid-Infrared High-Power Laser and Enhanced Gas Absorption

Sensors ◽  
2019 ◽  
Vol 19 (14) ◽  
pp. 3202 ◽  
Author(s):  
Shunda Qiao ◽  
Yufei Ma ◽  
Ying He ◽  
Xin Yu ◽  
Zhonghua Zhang ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Optical Absorption ◽  
Output Power ◽  
High Power ◽  
Photoacoustic Spectroscopy ◽  
Gas Absorption ◽  
Sensor System ◽  
Integration Time ◽  
High Power Laser ◽  
Power Laser

A photoacoustic spectroscopy (PAS)-based carbon monoxide (CO) gas sensor with a high-power laser and an enhanced gas absorption was demonstrated. The light source was a distributed feedback (DFB), continuous wave (CW) diode laser with a high output power of ~8 mW to give a strong excitation. The target gas received optical absorption enhanced two times by using a right-angle prism reflecting the laser beam. In order to reduce the noise from the background, wavelength modulation spectroscopy (WMS) and second-harmonic detection techniques were used. The modulation frequency and modulation depth were optimized theoretically and experimentally. Water vapor was added in the PAS sensor system to increase the vibrational–translational (V–T) relaxation rate of the CO molecule, which resulted in an ~8 times signal enhancement compared with the using of a dry CO/N2 gas mixture. The amplitude of the 2f signal had a 1.52-fold improvement compared to the one with only one time absorption. The experimental results showed that such a sensor had an excellent linear response to the optical power and gas concentration. At 1 s integration time, a minimum detection limit (MDL) for CO detection of 9.8 ppm was achieved. The long-term stability of the sensor system was evaluated with an Allan deviation analysis. When the integration time was 1100 s, the MDL improved to be 530 ppb. The detection performance of such a PAS-based CO sensor can be further improved when a laser with a higher output power and increasing optical absorption times is used.

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