Germanium Fabry Perot Etalon sales@dmphotonics.com
Del Mar Photonics offer variety of standard and custom germanium Fabry Perot etalons sales@dmphotonics.com Milliwatt second harmonic generation in quantum cascade lasers with modal phase matching Nonlinear light generation has the potential of expanding the functionality of quantum cascade lasers (QCLs). In particular second harmonic (SH) generation has shown promise for extending the spectral range of QCLs beyond the limits imposed by the properties of the materials of choice. The mid-infrared range between 3 and 5 mm is of great importance for applications in high resolution in situ and remote trace gas sensing. SHgeneration in QCLs based on the well developed InP material system offers an alternative to other more technologically demanding lasers available in this spectral range. Quantum Cascade Laser-Based Photoacoustic Sensor for Trace Detection of Formaldehyde Gas We report on the development of a photoacoustic sensor for the detection of formaldehyde (CH2O) using a thermoelectrically cooled distributed-feedback quantum cascade laser operating in pulsed mode at 5.6 m. A resonant photoacoustic cell, equipped with four electret microphones, is excited in its first longitudinal mode at 1,380 Hz. The absorption line at 1,778.9 cm-1 is selected for CH2O detection. A detection limit of 150 parts per billion in volume in nitrogen is achieved using a 10 seconds time constant and 4 mW laser power. Measurements in ambient air will require water vapour filters. Formaldehyde; Quantum cascade laser; Photoacoustic spectroscopy; Trace gas sensor. A New Quantum-Cascade Laser Based Spectrometer for High-Precision Airborne CO2 Measurements Rodrigo Jiménez et al. Harvard University -- Department of Earth and Planetary Sciences We present a new, compact, fast response mid-IR laser spectrometer for high-precision airborne measurements of CO2. The instrument is based on a thermoelectric-cooled, pulsed-operated DFB quantum-cascade (QC) laser. Unlike conventional cryogenical
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