Paper Information

Journal:   IRANIAN JOURNAL OF PHYSICS RESEARCH   Summer 2003 , Volume 3 , Number 4; Page(s) 97 To 100.
 
Paper: 

MIR-DIFFERENCE-FREQUENCY LASER SPECTROMETER FOR CO DETECTION IN COMBUSTIONS

 
 
Author(s):  KHORSANDI A., WILLER U., GEISER P., SCHADE W.
 
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Abstract: 

Two continuous-wave (cw) single mode diode-lasers (Toshiba TOLD 9150 and Sharp LT024MDO) are applied as pump and signal sources to obtain difference-frequency generation (DFG) in the mid-infrared (MIR) region by using an AgGaS2 crystal with a length of 30 mm for 90° type I phase-matching. Tunable MIR laser radiation around 5µm is obtained with an output power in the order of hundred nW while the diode lasers are operated at 20 and 30 n W around their center wavelengths 789 and 681 nun, respectively. To demonstrate the applicability of this MIR-DFG laser spectrometer we recorded the absorption spectrum of CO for the P (21) rotational line at 2055.4 cm-1 in a 10 cm long cell and in the flame of a McKenna burner in order to estimate the self-broadening coefficient of CO, the collisional-broadening of CO with CO2, and the CO concentration distribution in the flame.

 
Keyword(s):  LASER, DIFFERENCE-FREQUENCY, CO DETECTION, SPECTROMETER
 
References: 
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