Abstract
We describe a mid-infrared spectrometer that is based on the combination of a multiple-pass absorption cell and a submicrosecond pulsed quantum-cascade laser. The spectrometer is capable of both making sensitive measurements and providing a real-time display of the spectral fingerprint of molecular vapors. For a cell with a path length of 9.6 m, dilution measurements made of the v_9 band transitions of 1,1-difluoroethylene indicate a sensitivity of 500 parts in 10^9, corresponding to a fractional absorbance of 4 × 10^-4 .
| Original language | English |
|---|---|
| Pages (from-to) | 16-18 |
| Number of pages | 2 |
| Journal | Optics Letters |
| Volume | 28 |
| Issue number | 1 |
| Publication status | Published - Jan 2003 |
Keywords
- spectrometer
- quantum physics
- lasers
- molecular vapours
- optics