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Single-lobed Near Diffraction-limited Beam from 1W Laser Diode Array with an External Cavity |
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| Authors: | Hong Zhi CHEN Jun A.Hermerschmidt F.WANG H.J.Eichler |
| Affiliation: | 1. State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,Hangzhou 310027, China 2. Optical Institute, Technical University of Berlin10623 Berlin, Germany 3. Optical Institute, Technical University of Berlin,10623 Berlin, Germany |
| Abstract: | Abstract An external cavity for the laser diode array with a conventional mirror in what we call two-time self-injection operation is presented. The external cavity consists of two lenses, a flat external mirror(EM) in the image plane of the array and a prism that is used as an output coupler. The single-lobed near diffraction-limited far field beam of a 1 W 10-stripe gain-guided LD array lies at 6.4°～9° with the external cavity operation in two-time self-injection mode, whereas at 2.5°～3.0° for its normal feedback operation. The width of the far field beam (FWHM) is 0.43° and 0.63° at driving current of 2 and 3.2 ×Ithr, respectively, much narrower than that in normal feedback operation, but at the expense of lower output power. The output of the system is very stable and insensitive to the tilt and position of the EM. |
| Keywords: | external cavity spatial coherence laser diode array |
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