Browsing by Author "Tang, Cheng-Yu"

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Comparative Study Between Extracavity and Intracavity Frequency-Doubled Laser at 532 nm: Application for the Deep Ultraviolet Generation at 266 nm
(2015-01-01)
Huang, Yu-Jen
;
Tang, Cheng-Yu
;
Cho, Chun-Yu
;
Su, Kuan-Wei
;
Chen, Yung-Fu
We construct a reliable actively Q-switched Nd:YVO4 laser to comparatively investigate the output performance of the second harmonic generation between the extracavity and intracavity configurations under a similar operated condition. It is experimentally found that the peak power at 532 nm obtained with the extracavity second harmonic generation is remarkably higher than that obtained with the intracavity configuration, even though the higher output power and larger pulse energy can be acquired with the intracavity second harmonic generation. We further perform the extracavity fourth harmonic generation to verify that the extracavity second harmonic generation is more advantageous in generating deep ultraviolet laser at 266 nm than the intracavity one, where the conversion efficiencies from 532 to 266 nm for each case are 37.1% and 7.2%, respectively. Moreover, under an incident pump power of 26 W at 808 nm and a pulse repetition rate of 40 kHz, the output power at 266 nm as high as 1.67 W is effectually generated with the combination of the extracavity second and fourth harmonic generations, corresponding to the conversion efficiency from 808 to 266 nm up to 6.4%.
Efficient Continuous-Wave Self-Raman Nd:KGW Laser With Intracavity Cascade Emission Based on Shift of 89 cm(-1)
(2015-01-01)
Tang, Cheng-Yu
;
Zhuang, Wei-Zhe
;
Su, Kuan-Wei
;
Chen, Yung-Fu
;
電子物理學系
We demonstrated a continuous-wave (CW) self-Raman laser with high conversion efficiency by using Nd:KGW as the Raman crystal based on the Raman shift of 89 cm(-1). The maximum Raman output power was as high as 0.42 W under the pump power of 2.5 W. The diode-to-Stokes optical conversion efficiency was found to be 16.8% which is outstanding among Nd-doped CW self-Raman lasers. Besides, three resonators have been investigated to generate CW self-Raman lasers with different Raman shift of the Nd: KGW crystal at 1077.9 nm (89 cm(-1)), 1162.9 nm (768 cm(-1)), 1181.2 nm (901 cm(-1)), and 1193.7 nm (89cm(-1) + 901cm(-1)). These Raman lasers pave the way to generate more-closely spaced set of CW emission in the green-yellow-orange region.
Efficient Diode-Pumped Solid-State Laser At 266 nm
(2013)
Tang, Cheng-Yu
;
Huang, Yu-Jen
;
Su, Kuan-Wei
;
Chen, Yung-Fu
;
電子物理學系
We construct a reliable actively Q-switched Nd:YVO4 laser to make a comparative study for the second harmonic generation between the extracavity and intracavity configurations under a similar operated condition. The output power at 266 nm as high as 1.67 W is effectually generated with the combination of the extracavity second and fourth harmonic generations under an incident pump power of 26 W at 808 nm and a pulse repetition rate of 40 kHz, corresponding to the conversion efficiency from 808 to 266 nm up to 6.4 %.
Efficient Dual-Wavelength Synchronously Mode-Locked Picosecond Laser Operating on the F-4(3/2) -> I-4(11/2) Transition With Compactly Combined Dual Gain Media
(2015-01-01)
Huang, Yu-Jen
;
Tzeng, Ying-Shuen
;
Tang, Cheng-Yu
;
Chen, Yung-Fu
;
交大名義發表
A novel concept based on the dual gain media is originally proposed for achieving a compact efficient dual-wavelength synchronously mode-locked diode-end-pumped Nd laser on the F-4(3/2) -> I-4(11/2) transition. We theoretically and experimentally realize that the output power ratio between two spectral outputs could be flexibly controlled simply by varying the waist position of the pump beam inside the composite gain medium. With the developed tactic, the total output power at 1.06 m for balancing two-color intensities reaches 2.9 W. Moreover, suppressing the excitation of a few high-order transverse modes enables a fairly stable picosecond pulse train to be achieved with the self mode locking, where the mode-locked pulse width and repetition rate are measured to be 47 ps and 2.86 GHz, respectively. A series of 0.32 THz ultrashort pulses with the effective duration of 1.6 ps is further generated through the optical beating between two carrier frequencies of dual-wavelength synchronous pulses.
Efficient High-Energy Pulsed Pumped Passively Q-switched Nd:YLF/Cr4+:YAG UV Laser At 351 nm with a Nearly Hemispherical Cavity
(2013)
Huang, Yu-Jen
;
Tang, Cheng-Yu
;
Su, Kuan-Wei
;
Chen, Yung-Fu
;
電子物理學系
We utilize a nearly hemispherical cavity to develop a pulsed pumped passively Q-switched Nd:YLF/Cr4+:YAG UV laser. The pulse energy and peak power at 351 nm are efficiently generated to be 360 mu J and 44.1 kW.