Browsing by Author "Liang, Hsing-Chih"

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Exploring the spatio-temporal dynamics of an optically pumped semiconductor laser with intracavity second harmonic generation
(2012-11-15)
Liang, Hsing-Chih
;
Lee, Yi-Chun
;
Tung, Jung-Chen
;
Su, Kuan-Wei
;
Huang, Kai-Feng
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 transverse electromagnetic modes (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. (C) 2012 Optical Society of America
Generation of Orthogonally Polarized Mode-Locked Lasers at Wavelength of 1342 nm
(2017-10-01)
Liang, Hsing-Chih
;
Chang, Feng-Lan
;
Wu, Tai-Wei
;
Sung, Cheng-Lin
;
Chen, Yung-Fu
A mode-locked laser with orthogonal polarization at the wavelength of 1342 nm is experimentally achieved by using the natural birefringence of the Nd:YVO4 crystal. A total output power of 2.64 W could be obtained at an incident power of 14.4 W and the pulse durations are measured to be 15.1 and 16.9 ps with pulse repetition rates of 6.0 and 6.45 GHz for the laser output along the pi-and sigma-polarization, respectively. The mode-locked output is further found to exhibit a complex temporal trace with beat frequencies originated from the different central frequencies and pulse repetition rates.
Influence of High-Order Modes in Starting Self-Mode-Locked Optically Pumped Semiconductor Laser
(2013)
Liang, Hsing-Chih
;
Lee, Yi-Chun
;
Tung, Jung-Chen
;
Su, Kuan-Wei
;
Chen, Yung-Fu
We explored the influence of pump-to-mode size ratios on optically pumped semiconductor laser. With a large pump-to-mode size ratio, the output beam was self-modelocked with 1.17 ps pulse duration at a repetition rate of 1.8GHz.
Nondiffracting Superlattice Beams
(2013)
Tsou, Chia-Han
;
Wu, Tai-Wei
;
Tung, Jung-Chen
;
Liang, Hsing-Chih
;
Su, Kuan-Wei
We introduce a class of optical superlattices that are formed by two sets of wave vectors with single wave number but different azimuths. By a collimated light to illuminate a mask with multiple apertures, we generate nondiffracting superlattice beams.