Browsing by Author "Tung, Jung-Chen"

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Direct generation of red and orange optical vortex beams from an off-axis diode-pumped Pr3+:YLF laser
(2019-06-24)
Ma, Yuanyuan
;
Valles, Adam
;
Tung, Jung-Chen
;
Chen, Yung-Fu
;
Miyamoto, Katsuhiko
We demonstrate the direct generation of visible vortex beams at 640 nm and 607 nm by employing an off-axis pumping scheme in a diode end-pumped Pr3+:YLF laser. A detailed numerical analysis, based on the coherent superposition of Hermite-Gaussian modes with different amplitudes and phases, is perfectly consistent with the experimentally observed lasing modes. The maximum vortex output powers have been measured to be 808 mW and 211 mW at a pump power of 3.16 W, for the wavelengths of 640 nm and 607 nm, respectively. We also demonstrate the handedness control of the generated vortex beam. Such a visible vortex laser can potentially be applied in super-resolution fluorescent microscopes and micro-fabrication research. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Direct generation of vortex beams from a diode-pumped Pr3+:YLF laser
(2019-01-01)
Ma, Yuanyuan
;
Tung, Jung-Chen
;
Miyamoto, Katsuhiko
;
Omatsu, Takashige
;
交大名義發表
We have demonstrated the direct generation of visible structured light beams, scalar and vector vortex modes with a wavelength of 640nm from a diode-pumped Pr3+:YLF laser by employing an off-axis pumping technique. A maximum output of similar to 100 mW was achieved at a pump power of 1.2 W. Such red structured light beams will be potentially applied to super-resolution fluorescent microscopes and microfabrications. (C) 2019 The Author(s)
Exploring the spatio-temporal dynamics of an optically pumped semiconductor laser with intracavity second harmonic generation
(2012-11-15)
Liang, Hsing-Chih
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Lee, Yi-Chun
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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
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
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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.
Orthogonally Polarized Self-Mode-Locked Lasers With Repetition Rate Multiplication up to Hundreds of Gigahertz: Observation of Temporal Carpets
(2018-09-01)
Chen, Yung-Fu
;
Chang, Ming-Ting
;
Huang, Tzu-Lin
;
Tung, Jung-Chen
;
Huang, Kai-Feng
Mode-locked laser sources with high repetition rates in the range of 10-1000 GHz are of considerable interest in modern communications, optical metrology, and photonic applications. Currently, developed laser systems generally suffer from the hardware complexity and energy loss. Here, we demonstrate a compact robust scheme based on a self-mode-locked monolithic Yb:KGW laser with external feedback coupling to achieve numerous repetition rate multiplications in the range of 25-330 GHz. The output pulse train consists of two orthogonally polarized components to form a vector state that is beneficial to practical applications. More intriguing, the pulse train measured as a function of the distance of the coupling feedback reveals a feature of the fractional recurrence that is like the Talbot carpet. An analytic formula is derived to manifest the formation of the temporal carpets. The developed experiment and formula not only pave a useful way for generating ultrahigh-repetition-rate femtosecond lasers but also provide new perspectives in the fractional recurrences of coherent waves.