supported by the National High Technology Research and Development Program of China(Nos.2011AA010303,2012AA012203);the State Key Development Program for Basic Research of China(No.2011CB301702);the National Natural Science Foundation of China(Nos.61021003,61090392)
A 1.65μm three-section distributed Bragg reflector (DBR) laser for CH4 gas sensors is reported. The DBR laser has a wide tunable range covering the R3 and R4 methane absorption line manifolds. The wavelength tunabi...