2019 "Generalized wave-packet formulation with ray-wave connections for geometric modes in degenerate astigmatic laser resonators." Y. F. Chen, C. J. Tung, M. X. Hsieh, Y. H. Hsieh, H. C. Liang, and K. F. Huang (2019, Nov). OPTICS LETTERS, 44, 5366-5369. (SCI). MOST 108-2119-M-009-005. " Generating High-Order Transverse Patterns in Optically Pumped Semiconductor Lasers. " P. H. Tuan, Y. H. Hsieh, C. W. Tu, C. C. Lee, C. H. Tsou, H. C. Liang, K. F.Huang, and Y. F. Chen (2019, Nov).IEEE J. Sel. Top. Quantum Electron., 25, no. 6, 1501707. (SCI). MOST 108-2119-M-009-005. " Origin of continuous curves and dotted spots in laser transverse modes with geometric structures." Y. F. Chen, C. J. Tung, M. X. Hsieh, Y. H. Hsieh, H. C. Liang, and K. F. Huang (2019, Dec). OPTICS LETTERS, 44, 5989-5992. (SCI). MOST 108-2119-M-009-005. "Energy scale-up and mode-quality enhancement of the LED-pumped Nd:YAG Q-switched laser achieving a millijoule green pulse." C. Y. Cho, C. C. Pu, Y. F. Chen, and K. W. Su (2019, Jul). OPTICS LETTERS, 44,3202-3205. (SCI). "Exploring the formation of thermally detuned transverse patterns in a broad-area square VCSEL. "P. H. Tuan, Y. T. Yu, K. F. Huang, and Y. F. Chen (2019, Jun). OPTICS LETTERS, 44,3034-3037. (SCI). MOST 108-2119-M-009-005. " Laser wave-packet representation to unify eigenmodes and geometric modes in spherical cavities. " Y. F. Chen, S. C. Li, Y. H. Hsieh, J. C. Tung, H. C. Liang, and K. F. Huang (2019, Jun).OPTICS LETTERS, 44,2649-2652. (SCI). MOST 108-2119-M-009-005. "Direct generation of red and orange optical vortex beams from an off-axis diode-pumped Pr3+:YLF laser."Y. Ma, A. Vallés, J. C. Tung, Y. F. Chen, K. Miyamoto, and T. Omatsu (2019,Jun). OPTICS EXPRESS, 27, 18190-18200. (SCI). "Wave representation for asymmetric elliptic vortex beams generated from the astigmatic mode converter." Y. F. Chen, Y. H. Lai, M. X. Hsieh, Y. H. Hsieh, C. W. Tu, H. C. Liang, and K. F. Huang (2019, Apr). OPTICS LETTERS, 44,2028- 2031. (SCI). MOST 108-2119-M-009-005. "Efficient high-power dual-wavelength lime-green Nd:YVO4 lasers." Y. F. Chen, Y. C. Liu, Y. Y. Pan, D. Y. Gu, H. P. Cheng, C. H. Tsou, and H. C. Liang (2019, Mar). OPTICS LETTERS, 44,1323-1326. (SCI). MOST 108-2119-M-009-005. "Exploring elliptical vortex beams with the spatial damping effect. "Y. F. Chen, M. X. Hsieh, Y. H. Lai, Y. H. Hsieh, C. W. Tu, H. C. Liang, and K. F. Huang (2019, Feb). OPTICS LETTERS, 44,959-962. (SCI). MOST 108-2119-M-009-005. "Efficient high-power continuous-wave lasers at green-lime-yellow wavelengths by using a Nd:YVO4 self-Raman crystal. "Y. F. Chen, Y. Y. Pan, Y. C. Liu, H. P. Cheng, C. H. Tsou, and H. C. Liang (2019, Feb). OPTICS EXPRESS, 27, 2029-2035. (SCI). MOST 108-2119-M-009-005. "Exploring the DBR superlattice effect on the thermal performance of a VECSEL with the finite element method."Y. Huo, C. Y. Cho, K. F. Huang, Y. F. Chen, and C. C. Lee (2019, Jan). OPTICS LETTERS, 44,327-330. (SCI). MOST 108-2119-M-009-005. "Narrowing spectral linewidth in passively mode-locked solid-state lasers."Tzu Lin Huang, Shu Ching Li, Chia Han Tsou, Hsing Chih Liang, K. F. Huang,and Yung Fu Chen* (2018, Dec). OPTICS LETTERS, 43(23), 5753-5756.