Broad-area laser diode with 0.02 nm bandwidth and diffraction limited output due to double external cavity feedback

Chen, Jun; Wu, Xiaodong; Ge, Jianhong; Hermerschmidt, Andreas; Eichler, Hans Joachim
July 2004
Applied Physics Letters;7/26/2004, Vol. 85 Issue 4, p525
Academic Journal
External cavity feedback for a broad-area laser diode (BAL) with antireflection coating on the front facet is investigated experimentally. The feedback is created by a high-reflection mirror and a blazed grating, which reflect two parts of the laser emission back to the BAL, thereby forming an external resonator. When a Fabry–Perot etalon was inserted into the resonator an output beam with a bandwidth of 0.02 nm and power of 150 mW was obtained. The beam diffraction limited factor amounted to M2=1.16.


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