Abstract
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 12CH3D12CH4 isotope ratio measurements. The suitable pair of 12CH3Dv4 pP(7,6) and 12CH4 ν2+ν4 R(6) F1(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.
Original language | English |
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Pages (from-to) | 6612-6622 |
Number of pages | 11 |
Journal | Sensors |
Volume | 10 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2010 Jul |
Externally published | Yes |
Keywords
- Difference frequency generation
- Isotope ratio
- Laser spectroscopy
- Methane
- Waveguide PPLN
ASJC Scopus subject areas
- Analytical Chemistry
- Information Systems
- Biochemistry
- Atomic and Molecular Physics, and Optics
- Instrumentation
- Electrical and Electronic Engineering