科研之友
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摘要
We demonstrate cw output powers >290 mW into a nearly diffraction-limited (M-2 approximate to 2.2) output beam from an interband cascade laser operating at lambda = 3.6-3.7 mu m at room temperature. The interband cascade laser was designed for nearly equal electron and hole populations in the active region with heavy electron-injector doping, and was processed into narrow ridges mounted epitaxial side down on a copper heat sink. A 15.7-mu m-wide, 4-mm-long ridge with the back facet coated for high reflection (HR) and an anti-reflection-coated front facet produced 253 mW of cw output power at T = 25 degrees C into a beam with M-2 approximate to 2.7. Furthermore, corrugating the sidewalls of the ridge leads to a 20% improvement in the brightness. A 15.7-mu m-wide, 0.5-mm-long ridge with an HR-coated back facet and an uncoated front facet exhibited a maximum cw wall-plug efficiency of nearly 15% at room temperature.
- 出版日期2012-9-10
