Browsing by Author "Sung, Cheng-Lin"

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Flexibly Controlling the Power Ratio of Dual-Wavelength SESAM-Based Mode-Locked Lasers With Wedged-Bonded Nd: YVO4/Nd: GdVO4 Crystals
(2018-09-01)
Liang, Hsin-Chih
;
Huang, Tzu-Lin
;
Chang, Feng-Lan
;
Sung, Cheng-Lin
;
Chen, Yung-Fu
A new diffusion-bonded Nd: YVO4/Nd: GdVO4 hetero-structure crystal with oblique interface between two vanadate materials is exploited to achieve dual-wavelength passively mode-locked laser with a semiconductor saturable absorber mirror. Experimental results show that the power ratio of the two emission wavelengths can be flexibly adjusted by controlling the vertical position of pump beam. In the optimally balanced dual-wavelength operation, the maximum total output power of 2.5 W is obtained at an incident pump power of 11 Wand the pulse width is measured to be 24.7 ps with pulse repetition rate of 296.6 MHz. The mode-locked output pulse is further found to exhibit an optically beating with pulse duration of 1.8 ps at a repetition rate of 0.318 THz.
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.