An Optically Pumped Far-Infrared Folded Mirror-Less Cavity
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A compact and efficient mirror-less cavity is presented for an optically pumped 192-μm far-infrared laser. With a gold-coated mirror and 30°-inclined anti-reflection coated Ge plate serving as highly reflective mirrors, a folded mirror-less CH3F cavity is achieved. Maximum energy of 0.72 mJ is obtained with the pump energy of 600 mJ, which gives an energy increment of 75% in comparison with the previous 1.85-m mirror-less system. The beam divergence angle of the FIR radiation from this folded mirror-less cavity is measured to be 14.2 mrad.
KeywordsFar-infrared gas laser Mirror-less cavity Double-pass amplification
This work is supported by the Science and Technology Project of Jilin Province (No. 20150623024TC-07), the Foundation for Young Scientists of Jilin Province (No. 20170520161JH), and the Foundation of Jilin Educational Committee (No. 2015-77).