Browsing by Author "Huang, Tzu Lin"

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Compact coupling scheme to achieve the synchronously dual self-mode-locked operation with a 35.2 THz optical beating
(2017-06-01)
Cheng, Hao Ping
;
Huang, Tzu Lin
;
Sung, Cheng Lin
;
Cho, Chun Yu
;
Liang, Hsing Chih
A synchronously dual self-mode-locked (SML) operation at 946 and 1064 nm is experimentally accomplished by using a compact coupling scheme to obtain the optical beating frequency up to 35.2 THz. The SML emissions at 946 and 1064 nm are established by a monolithic Nd:YAG cavity and a Nd: YVO4 crystal in a flat-flat cavity, respectively. Two gain media are butt adjoined to be longitudinally pumped by a single laser diode. The monolithic Nd: YAG crystal is used not only as the 946 nm laser cavity, but also as the output coupler of the Nd: YVO4 1064 nm laser. More importantly, the output surface of the monolithic Nd: YAG laser is coated to generate the optical feedback for the synchronization of the dual SML operation. At a pump power of 10.7 W, the output powers at 1064 and 946 nm can simultaneously reach 1.5 W by controlling the focal position of the pump waist. (C) 2017 Optical Society of America
Narrowing spectral linewidth in passively mode-locked solid-state lasers
(2018-12-01)
Huang, Tzu Lin
;
Li, Shu Ching
;
Tsou, Chia Han
;
Liang, Hsing Chih
;
Huang, K. F.
A novel scheme to realize a mode-locked laser with a narrow spectral linewidth is demonstrated by exploiting a reflected Fabry-Perot (FP) cavity to introduce an intense FP effect. Stable continuous-wave mode-locked operation is achieved with the repetition rate of 48 MHz and the maximum average output power of 2.6 W under an incident pump power of 11.9 W. The mode-locked pulse width is systematically investigated by varying the optical thickness of the reflected FP cavity. The pulse duration is experimentally found to be in a range of 0.8 to 2.6 ns. The experimental results reveal that the reflected FP cavity is the key factor leading to the pulse generation in the nanosecond regime. This Letter is believed to provide a promising method for generating optical pulses with narrow spectral linewidths. (C) 2018 Optical Society of America
Orthogonally polarized single-longitudinal-mode operation in a dual-wavelength monolithic Nd:YAG laser at 1319 nm and 1338 nm
(2018-08-01)
Cheng, Hao Ping
;
Liu, Yu Cheng
;
Huang, Tzu Lin
;
Liang, Hsing Chih
;
Chen, Yung Fu
Single-longitudinal-mode operation with single-wavelength emission at 1319 nm and dual-wavelength emission at 1319 and 1338 nm is realized by utilizing two types of coating specification for monolithic Nd:YAG lasers. Each longitudinal mode consists of two orthogonally polarized modes. Experimental results reveal that the frequency splitting between two orthogonal polarizations can be tuned by changing the external mechanical force applied on the Nd:YAG crystal. The beat frequency can be linearly varied from 181.3 MHz to 1.64 GHz. The beat frequencies between two orthogonally polarized modes at 1319 and 1338 nm are found to be very close, and their difference can be changed from 4.5 to 19.9 MHz by increasing the external mechanical force from 1.6 to 15 N. (C) 2018 Chinese Laser Press