Tunable high-efficient pulsed NH3 terahertz lasers

Experimental studies on a tunable efficient high-efficient pulsed NH 3 terahertz (THz) lasers pumped by TEA CO 2 lasers are presented. When NH 3 is pumped by the different lines with the CO 2 lasers, the generation of different terahertz radiations is discussed. The lines of the CO 2 lasers are 9R(08), 9P(20), 10R(14), 10R(08), and 10R(06). To improve THz laser energy and photon conversion efficiency, different higher power of the CO 2 laser can effectively improve THz laser energy and photon conversion efficiency. When the 9P(20) CO 2 lasers with 9.68 J and 4.12 J pump NH 3 , the corresponding energy conversion efficiencies are 0.28% and 0.19%, increasing by a factor of about 1.5. The generation of terahertz radiations with energy as high as 27.29 mJ and 7.73 mJ are obtained, respectively, increasing by a factor of about 3.5. Meanwhile, for 10R(14) line, the energy conversion efficiencies increase to 8.5 times and the energy of THz lasers increase to 32 times.