Zhenlin Liu
Tohoku University
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Publication
Featured researches published by Zhenlin Liu.
Journal of Crystal Growth | 2000
Izilda Marcia Ranieri; Kiyoshi Shimamura; K. Nakano; Tomoyo Fujita; Zhenlin Liu; Nobuhiko Sarukura; T. Fukuda
Abstract High-quality Cexa0:xa0LiLuF 4 (Cexa0:xa0LLF) crystals were grown by the Czochralski technique using CF 4 as reactive atmosphere. The segregation coefficient of Ce 3+ was determined to be 0.066 (3). No changes in the lattice parameters due to the presence of the Ce 3+ in the lattice were observed. Laser action in the ultraviolet region was obtained by pumping this active medium with a KrF excimer laser in 248xa0nm.
Journal of Crystal Growth | 2001
Toshimasa Kozeki; Yuji Suzuki; Masahiro Sakai; Hideyuki Ohtake; Nobuhiko Sarukura; Zhenlin Liu; Kiyoshi Shimamura; Kenji Nakano; Tsuguo Fukuda
Abstract The transmission spectra of LiCaAlF 6 (LiCAF) and LiSrAlF 6 (LiSAF) are investigated in the ultraviolet (UV) and the vacuum ultraviolet (VUV) region. The transmission edge of LiCAF (112xa0nm) shows almost the same value as that of LiF. Taking into account difficulties of material processing and polishing due to the cleavage or the hydroscopic nature of LiF, LiCAF is regarded as a more suitable optical material in the UV and the VUV region. Moreover, the new excitation channel around 112xa0nm is discovered for Cexa0:xa0LiCAF crystal. This excitation is originated not from absorption of Cerium ions but from absorption around the bandgap of the host crystal.
Optical Materials | 2002
Zhenlin Liu; Kiyoshi Shimamura; Tsuguo Fukuda; Toshimasa Kozeki; Yuji Suzuki; Nobuhiko Sarukura
Abstract A large Ce3+:LiCaAlF6 (Ce:LiCAF) crystal with 15 mm diameter was grown successfully by the Czochralski method. Owing to its large size, 60 mJ, 289 nm pulses were generated directly from a quasi-coaxially pumped Ce:LiCAF laser. In addition, a new noncollinear Brewster-angle-pumping disk oscillator scheme was demonstrated for further output-energy scaling. An ultraviolet solid-state Ce3+:LiLuF4 (Ce:LLF) laser which was pumped transversely by a KrF excimer laser with the repetition rate of 1 Hz produced a 27 mJ, 309 nm pulse using a large Ce:LLF crystal which was grown by the Czochralski method, and the slope efficiency was approximately 17%.
Growth, Fabrication, Devices, and Applications of Laser and Nonlinear Materials | 2001
Amina Bensalah; Kiyoshi Shimamura; Zhenlin Liu; Nobuhiko Sarukura; Tsuguo Fukuda
Ce-doped LiCAF (Ce:LiCAF), LiSrAlF6 (Ce:LiSAF) and LiSr0.8Ca0.2AlF6 (Ce:LiSCAF) single crystals were grown by the Czochralski technique as ultraviolet, tunable, solid- state laser media. Optical characterization and Laser activity were investigated. Crystal growth was performed in Czochralski system (CZ) under an atmosphere of CF4 with previous treatment in high vacuum (approximately equals 10-2 Pa). Under such conditions, we succeeded to grow Ce:LiCAF, Ce:LiSAF and Ce:LiSCAlF (18 mm in diameter and 60 mm in length) single crystals. Laser rods were cut from the above mentioned crystal boules. The laser resonator was established by a flat high reflector and a flat output coupler. The forth harmonic of a Q-switched Nd:YAG laser was used as the pumping source. Laser oscillations at around 290 nm were measured. 60 mJ pulses were generated directly from the Ce:LiCAF crystal. Gain has been observed for the Ce:LiSCAlF crystal and laser oscillation was confirmed.
Advanced Solid State Lasers (1999), paper PD9 | 2001
Zhenlin Liu; Shinji Izumida; Shingo Ono; Hideyuki Ohtake; Nobuhiko Sarukura
We have demonstrated high-average power mode-locked Ti:sapphire laser with newly-invented intra-cavity cw-amplification scheme. This scheme can be applicable for the power scaling of other lasers.
conference on lasers and electro optics | 2000
Zhenlin Liu; Kiyoshi Shimamura; Kenji Nakano; Na Mujilatu; Tsuguo Fukuda; Toshimasa Kozeki; Hideyuki Ohtake; Nobuhiko Sarukura
Summary form only given. Ce/sup 3+/:LiCaAlF/sub 6/ (Ce:LiCAF) and Ce/sup 3+/:LiLuF/sub 4/ (Ce:LLF) have been identified to be efficient and convenient ultraviolet (UV) lasing media. We have demonstrated an all-solid-state tunable Ce:LLF laser pumped by the fifth harmonic of an Nd:YAG laser. We have also demonstrated an efficient Ce:LiCAF MOPA system. Previously, the output energy was limited by available crystal sizes. Therefore, we grow larger crystals up to about 1-inch diameter by Czochralski (CZ) method. In this presentation, we report the generation of 27-mJ pulse from a Ce:LLF oscillator and 60-mJ pulse from a Ce:LiCAF oscillator using large-size Ce:fluoride crystals. Furthermore, a new pumping configuration with pumping at Brewster angles on the disk-shaped crystal was designed.
Nonlinear Optics: Materials, Fundamentals, and Applications. Technical Digest. Postconference Edition. TOPS Vol.46 (IEEE Cat. No.00CH37174) | 2000
Zhenlin Liu; Kiyoshi Shimamura; K. Nakano; T. Fukuda; Yusaburo Segawa; Toshimasa Kozeki; H. Ohtake; Nobuhiko Sarukura
Using (Czochralski) CZ-grown large laser crystals, 60-mJ pulses and 27-mJ pulses were obtained from Ce:LiCaAlF/sub 6/ (Ce:LiCAF) and Ce:LiLuF/sub 4/ (Ce:LLF) lasers. Additionally, a new non-collinear Brewster-pumping disk Ce:LiCAF laser oscillator scheme was demonstrated for further output-energy scaling.
Archive | 2002
Zhenlin Liu; Nobuhiko Sarukura; Mark A. Dubinskii
Archive | 2006
Shingo Ono; Nobuhiko Sarukura; Zhenlin Liu
Archive | 2000
Tae-Woo Lee; Oi Ok Park; R. E. Bartolo; W. W. Bewley; Igor Vurgaftman; C. L. Felix; Jerry R. Meyer; M. J. Yang; John D. Bruno; John L. Bradshaw; Rui Q. Yang; John T. Pham; Donald E. Wortman; Young Ki Hong; K. Alan Shore; James Lawrence; Daniel M. Kane; Heinz W. Schmidt; Rajeev J. Ram; David Scott Citrin; Daniel Ochoa; R. Houdré; Richard P. Stanley; M. Ilegems; Henri Benisty; Christian Hanke; Bernd Borchert; Zhenlin Liu; Hidetoshi Murakami; Toshimasa Kozeki