| Autor: |
Jiang T, Chen QD, Zhang J, Tian ZN, Niu LG, Li QS, Wang HY, Qin L, Sun HB |
| Jazyk: |
angličtina |
| Zdroj: |
Optics letters [Opt Lett] 2013 Oct 01; Vol. 38 (19), pp. 3739-42. |
| DOI: |
10.1364/OL.38.003739 |
| Abstrakt: |
An elliptical monolithic bifocal zone plate as a collimating lens, whose two focal lengths in the orthogonal directions match the different beam waist positions of the fast and slow axes' light from edge-emitting laser diodes, is proposed and experimentally demonstrated by employing femtosecond laser direct writing technology. The high-quality eight-level zone plate exhibits a diffraction efficiency of 92.9%, which is much higher than those ever reported. Shaped by the elliptical lens, the laser diodes' divergence angles are simultaneously reduced from 65° (1134 mrad, fast axis) and 24° (418 mrad, slow axis) to 7.7 and 136.5 mrad, respectively. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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