Abstract:Two types of electro-optically Q-switched Er:Cr:YSGG lasers with different polarizing mechanisms have been operated. For the one Q-switching and polarizing are realized with only a LiNbO 3 crystal with both ends cut at Brewster's angle and for the other they are achieved by a cubic LiNbO3 crystal and a Glan-Taylor prism, respectively. The two schemes are compared with regard to both the mechanical and laser Q-switched properties. Input energy, J Glan-Taylor prism scheme Brewster angle schemeComparison of Q-switched pulse width from Brewster angle scheme and from Glan-Taylor prism scheme

Abstract:The technique of Second-Harmonic Generation (SHG) of CO2 laser for carbon monoxide concentration detection is investigated in this paper. A simple mechanical Q-switched CO 2 laser is used in our experiment, which works at 9.586 µm. The nonlinear optical crystal used for frequency doubling is ZnGeP2. Different CO concentration detections are performed and 100ppm detectable sensitivity is obtained.