Distributed feedback（DFB） quantum cascade lasers（QCLs） in continuous-wave（CW） mode emitting atλ≈7.6μm are presented.Holographic lithography was used to fabricate the first-order distributed feedback grating. ...Distributed feedback（DFB） quantum cascade lasers（QCLs） in continuous-wave（CW） mode emitting atλ≈7.6μm are presented.Holographic lithography was used to fabricate the first-order distributed feedback grating. For a high-reflectivity-coated QCL with 14.5-μm-wide and 3-mm-long cavity,CW output powers of 300 mW at 85 K and still 10 mW at 270 K are obtained.Single-mode emission with a side-mode suppression ratio（SMSR） of about 30 dB and a wide tuning range of ~300 nm in the temperature range from 85 to 280 K is observed.展开更多
基金supported by the National Science Fund for Distinguished Young Scholars of China(No.60525406)the National Natural Science Foundation of China(Nos.60736031,60806018,60906026)the National High Technology Research and Development Program of China(Nos.2007AA03Z446,2009AA03Z403)
文摘Distributed feedback（DFB） quantum cascade lasers（QCLs） in continuous-wave（CW） mode emitting atλ≈7.6μm are presented.Holographic lithography was used to fabricate the first-order distributed feedback grating. For a high-reflectivity-coated QCL with 14.5-μm-wide and 3-mm-long cavity,CW output powers of 300 mW at 85 K and still 10 mW at 270 K are obtained.Single-mode emission with a side-mode suppression ratio（SMSR） of about 30 dB and a wide tuning range of ~300 nm in the temperature range from 85 to 280 K is observed.
