Browsing by Author "Hunag, K. F."

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AlGaInAs quantum-well 1.3-mu m laser by a diode-pumped actively Q-switched Nd : GdVO4 laser - art. no. 68712K
(2008)
Huang, S. C.
;
Su, K. W.
;
Li, A.
;
Liu, S. C.
;
Chen, Y. F.
We report a high-peak-power AlGaInAs 1.36-mu m vertical-external-cavity surface-emitting laser (VECSEL) optically pumped by a diode-pumped actively Q-switched Nd:GdVO4 1.06-mu m laser under room-temperature operation. The gain medium is an AlGaInAs quantum wells (QWs)/barrier structure grown on a Fe-doped InP substrate by metalorganic chemical-vapor deposition. With an average pump power of 1.9 W, an average output power of 340 mW was obtained at a pulse repetition rate of 40 kHz, corresponding to an optical-to-optical conversion efficiency of 18.76%. With a peak pump power of 7.9 kW, the highest peak output power was 1.3 kW at a pulse repetition rate of 10 kHz.
Exploring spatio-temporal dynamics of an optically pumped semiconductor laser with intracavity second harmonic generation
(2013)
Lee, Y. C.
;
Liang, H. C.
;
Tung, J. C.
;
Su, K. W.
;
Chen, Y. F.
We experimentally observe an intriguing phenomenon of complex spatio-temporal dynamics in a commercial optically pumped semiconductor laser with intracavity second harmonic generation. We numerically verify that the experimental results come from the total mode locking of TEM00 and higher-order modes with significant astigmatism. The scenarios of the spatio-temporal dynamics are quite similar to the phenomena in soft-aperture Kerr-lens mode locked Ti:sapphire lasers.
Self mode locked OPSL: role of high-order modes in starting self-mode-locked operation
(2013)
Liang, H. C.
;
Lee, Y. C.
;
Tung, J. C.
;
Su, K. W.
;
Chen, Y. F.
We have experimentally explored the influence of high-order modes on the temporal dynamic of optically pumped semiconductor laser with two different pump-to-mode size ratios omega(p)/omega(l). With a large pump-to-mode size ratio of 1.45, the output beam profile contributed of TEM0,0 mode and few high-order TEMn,m modes were observed and self-mode-locked operation can be started simultaneously. At an incident pump power of 20W, the laser emits 6 W of average output power with 1.17 ps pulse duration at a repetition rate of 1.2GHz.