Absolute frequency control of a 1560 nm (192 THz) DFB laser locked to a rubidium absorption line using a second-harmonic-generated signal

1995 ◽  
Vol 44 (4) ◽  
pp. 839-842
Author(s):  
C. Latrasse ◽  
M. Poulin ◽  
M. Tetu ◽  
M. Breton ◽  
M. Poirier
Keyword(s):  
Absorption Line ◽  
Second Harmonic ◽  
Frequency Control ◽  
Absolute Frequency ◽  
Dfb Laser

scholarly journals Hydrogen Sensor Based on Tunable Diode Laser Absorption Spectroscopy

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5313 ◽  
Author(s):  
Viacheslav Avetisov ◽  
Ove Bjoroey ◽  
Junyang Wang ◽  
Peter Geiser ◽  
Ketil Gorm Paulsen
Keyword(s):  
Absorption Line ◽  
Hydrogen Sensor ◽  
Tunable Diode Laser ◽  
Integration Time ◽  
Contactless Measurement ◽  
Pure Hydrogen ◽  
Collisional Broadening ◽  
Laser Absorption ◽  
Dfb Laser ◽  
Averaging Time

A laser-based hydrogen (H2) sensor using wavelength modulation spectroscopy (WMS) was developed for the contactless measurement of molecular hydrogen. The sensor uses a distributed feedback (DFB) laser to target the H2 quadrupole absorption line at 2121.8 nm. The H2 absorption line exhibited weak collisional broadening and strong collisional narrowing effects. Both effects were investigated by comparing measurements of the absorption linewidth with detailed models using different line profiles including collisional narrowing effects. The collisional broadening and narrowing parameters were determined for pure hydrogen as well as for hydrogen in nitrogen and air. The performance of the sensor was evaluated and the sensor applicability for H2 measurement in a range of 0–10 %v of H2 was demonstrated. A precision of 0.02 %v was achieved with 1 m of absorption pathlength (0.02 %v∙m) and 1 s of integration time. For the optimum averaging time of 20 s, precision of 0.005 %v∙m was achieved. A good linear relationship between H2 concentration and sensor response was observed. A simple and robust transmitter–receiver configuration of the sensor allows in situ installation in harsh industrial environments.

Dither-free absolute frequency locking of a 1.3 mu m DFB laser on /sup 87/Rb

1992 ◽  
Vol 4 (4) ◽  
pp. 327-329 ◽  
Author(s):  
R. Boucher ◽  
M. Breton ◽  
N. Cyr ◽  
M. Tetu
Keyword(s):  
Absolute Frequency ◽  
Frequency Locking ◽  
Dfb Laser

scholarly journals Cavity ring-down spectroscopy of Doppler-broadened absorption line with sub-MHz absolute frequency accuracy

2012 ◽  
Vol 20 (9) ◽  
pp. 9956 ◽  
Author(s):  
C.-F. Cheng ◽  
Y. R. Sun ◽  
H. Pan ◽  
Y. Lu ◽  
X.-F. Li ◽  
...  
Keyword(s):  
Absorption Line ◽  
Absolute Frequency ◽  
Cavity Ring Down Spectroscopy ◽  
Cavity Ring Down
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