Abstract
Mid-infrared radiation at 3.43 μm is generated by difference frequency mixing a 1.064 μm Nd:YAG laser with a methane gas Raman shifted Nd:YAG (1.064 μm) laser at 1.54 μm in KTiOAsO4 (KTA). Using this pulsed (7 ns), moderate energy (1 mJ) source we demonstrate the optical detection of methane in air and measure an absorption coefficient of 1.2 cm-1atm-1. Additional source characteristics include an intrinsic wavelength stability defined by the methane Raman vibrational frequency and a moderate linewidth (∼1.5 cm-1).
Original language | English |
---|---|
Pages (from-to) | 307-310 |
Number of pages | 4 |
Journal | Optics Communications |
Volume | 120 |
Issue number | 5-6 |
DOIs | |
Publication status | Published - 1 Nov 1995 |