Browsing by Author "Zhang, J. Y."

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Control of optical loss in GaN-based planar cavities
(2015-12-01)
Ying, L. Y.
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Hu, X. L.
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Liu, W. J.
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Zhang, J. Y.
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Zhang, B. P.
Optical losses in GaN-based resonant planar cavity are discussed and experimentally examined in respects of indium tin oxide (ITO) inner-cavity current spreading layer, the defect-rich GaN layer, and multi-quantum well (MQW) active region. Devices with different structures are adopted to study the optical loss. It is demonstrated that a thin ITO layer and a coupled MQW active region are essential to achieve a low loss and high Q-value cavity. The results show that low-loss MQW design is particularly important in fabricating high-Q value GaN-based planar cavities. (C) 2015 Elsevier Ltd. All rights reserved.
High-power picoseconds 355 nm laser by third harmonic generation based on CsB3O5 crystal
(2007-07-01)
Guo, L.
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Wang, G. L.
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Zhang, H. B.
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Cui, D. F.
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Wu, Y. C.
We report on the high average power third harmonic generation (THG) of a mode-locked picosecond laser in a CsB3O5 (CBO) crystal. The picosecond laser beam at 1064 nm is produced by a home-made 30 W master oscillator power-amplifier (MOPA) Nd:YVO4 laser system. The maximum THG output at 355 nm is up to 5.4 W. We also investigate the phase matching angle at different temperatures. During high power operation, the temperature of the CBO crystal is set at a high temperature of more than 100 degrees C. The THG system has shown a fine long-term stability for more than two months of operation.