An Efficient and Compact Difference-Frequency-Generation Spectrometer and Its Application to 12CH3D/12CH4 Isotope Ratio Measurements
نویسندگان
چکیده
We have developed an efficient and compact 3.4 μm difference-frequency-generation spectrometer using a 1.55 μm distributed feedback (DFB) laser diode, a 1.06 μm DFB laser diode, and a ridge-waveguide periodically poled lithium niobate. It is continuously tunable in the 30 cm(-1) span and is applied to (12)CH(3)D/(12)CH(4) isotope ratio measurements. The suitable pair of (12)CH(3)D ν(4) (p)P(7,6) and (12)CH(4) ν(2)+ν(4) R(6) F(1)((1)) lines enabled us to determine their isotope ratio with a precision repeatability of 0.8‰ using a sample and a working standard of pure methane with an effective signal averaging time of 100 ms.
منابع مشابه
Continuous-Wave Difference-Frequency Generation in Periodically Poled RbTiOAsO4 Crystal and Application to Isotopic Analysis of Methane
We report on development of a widely tunable infrared (3.4-4.5 μm) continuous-wave laser spectrometer based on difference frequency generation in a periodically poled RbTiOAsO4 crystal and its application to isotope analysis of CH4/CH4. ©2006 Optical Society of America OCIS codes: (190.2620) Frequency conversion; (190.4400) Nonlinear optics, material; (300.6360) Laser spectroscopy
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