WELWYN GARDEN CITY, England, Sept. 17, 2010 — Hamamatsu Photonics UK Ltd. has introduced a range of quantum cascade distributed feedback (DFB) lasers. The L10195 series is available in continuous-wave and pulsed models, with standard emission wavelengths from 4565 to 9670 nm. CW output powers range from 15 to 80 mW, while the pulsed output powers range from 100 to 300 mW. Pulsed mode operation is at room temperature, and CW operation is at 77 K. Quantum cascade laser (QCL) technology is the only mid-infrared semiconductor laser that can easily operate at room temperature using Peltier cooling. Because the L10195 instruments have a very narrow spectral linewidth and wide tunability by changing the chip temperature, they are good candidates for the next generation of infrared laser spectroscopy systems. This technique has widespread applications for environmental monitoring, medical diagnostics (such as breath analysis), process control and security applications (such as explosives detection). Because the quantum cascade laser does not have a p-n junction, it is not a true laser diode; instead, it uses inter sub-b and transitions. The tunability of the QCL emission wavelength enables measurement of a wide variety of gases such as CH4, N2O and H2CO at their absorption lines within this tuning range. The lasers offer high reliability and good consistency from one device to the next. Pulsed forward current is 3 A, pulsed radiant output power is 80 mW, pulse duration is 250 ns FWHM, and duty ratio is 20%. Operating temperature ranges from -30 to 30 °C.