Multi-mode absorption spectroscopy with mid-infrared interband cascade lasers for multi-species sensing
Optica Publishing Group (2016) lt2g.3
Multi-species sensing using multi-mode absorption spectroscopy with mid-infrared interband cascade lasers
Optica Publishing Group (2016) jf2k.4
Mid-infrared multi-mode absorption spectroscopy using interband cascade lasers for multi-species sensing.
Optics letters 40:17 (2015) 4186-4189
Abstract:
An interband cascade laser (ICL) operating at 3.7 μm has been used to perform multimode absorption spectroscopy, MUMAS, at scan rates up to 10 kHz. Line widths of individual modes in the range 10-80 MHz were derived from isolated lines in the MUMAS signatures of HCl. MUMAS data for methane covering a spectral range of 30 nm yielded a detection level of 30 μbar·m for 1 s measurement time at 100 Hz. Simultaneous detection of methane, acetylene, and formaldehyde in a gas mixture containing all three species is reported.Photo-induced optical activity in phase-change memory materials
Scientific Reports Springer Nature 5 (2015) 8770
Abstract:
We demonstrate that optical activity in amorphous isotropic thin films of pure Ge2Sb2Te5 and N-doped Ge2Sb2Te5N phase-change memory materials can be induced using rapid photo crystallisation with circularly polarised laser light. The new anisotropic phase transition has been confirmed by circular dichroism measurements. This opens up the possibility of controlled induction of optical activity at the nanosecond time scale for exploitation in a new generation of high-density optical memory, fast chiroptical switches and chiral metamaterials.Mid-infrared multi-mode absorption spectroscopy, MUMAS, using difference frequency generation
Applied Physics B: Lasers and Optics 118:3 (2015) 343-351