Dual wavelength 3.2-µm source for isotope ratio measurements of (13)CH(4)/(12)CH(4).
Opt Express
; 23(17): 21786-97, 2015 Aug 24.
Article
in En
| MEDLINE
| ID: mdl-26368155
ABSTRACT
Difference frequency generation using one 1.58-µm and two 1.06-µm distributed feedback Bragg-grating laser diodes and a ridge-type PPLN alternately provide two 3.2-µm coaxial waves resonant with individual isotopic transitions separated by 13 cm(-1). The ν(3) band R(6) A(2) allowed transition of (13)CH(4) and the ν(3) band R(6) A(2) weakly allowed transition of (12)CH(4) are an ideal pair for isotope ratio measurements. The (13)CH(4)/(12)CH(4) isotope ratio is determined for three sample gases with a relative uncertainty of 0.7 , and it is confirmed that the temperature dependence is smaller than the uncertainty.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Opt Express
Journal subject:
OFTALMOLOGIA
Year:
2015
Type:
Article