[1] Werle P,Slemr F,Maurer K,et al. Near-and mid-infrared laser-optical sensors for gas analysis [J].Opt. Lasers Engin.,2002,37: 101-114.
[2] Fried A,Henry B,Wert B,et al. Laboratory,ground-based,and airborne tunable diode laser systems: performance characteristics and applications in atmospheric studies [J].Appl. Phys. B,1998,67: 317-330.
[3] Gmachl C,Straub A,Colombelli R,et al. Single-mode,tunable distributed-feedback and multiple wavelength quantum cascade lasers [J].IEEE Quantum Electron.,2002,38: 569-581.
[4] Lambrecht A. Quantum cascade lasers,systems,and applications in Europe [C].Proceedings of SPIE,2005,5732:122-133.
[5] Weidmann D,Kosterev A A,Roller C,et al. Monitoring of ethylene by a pulsed quantum cascade laser [J].Appl.Opt.,2004,43(16):3329-3334.
[6] Fischer C,Sigrist M W. Mid-IR difference frequency generation [J].Topics Appl. Phys.,2003,89: 97-143.
[7] Chen W,Mouret L G,Boucher D,et al. Mid-infrared trace gas detection using continuous-wave difference frequency generation in periodically poled RbTiOAsO4 [J].Appl. Phys. B,2001,72: 873-876.
[8] Richter L D,Fried L A,Wert B P,et al. Development of a tunable mid-IR difference frequency laser source for highly sensitive airborne trace gas detection [J].Appl. Phys. B,2002,75: 281-288.
[9] Jundt D. Temperature-dependent sellmeier equation for the index of refraction,ne,in congruent lithium niobate [J].Opt. Lett.,1997,22(20): 1553-1555.
[10] Canarelli P,Benko Z,Curl R,et al. Continuous-wave infrared laser spectrometer based on difference frequency generation in AgGaS for high-resolution spectroscopy [J].J. Opt. Soc. Am. B,1992,9: 197-202.