Mitsuru Musha
University of Electro-Communications
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Publication
Featured researches published by Mitsuru Musha.
Applied Physics Letters | 2002
J. Lu; K. Takaichi; T. Uematsu; Akira Shirakawa; Mitsuru Musha; Ken-ichi Ueda; H. Yagi; T. Yanagitani; A. A. Kaminskii
A solid-state laser material based on highly transparent cubic Nd3+:Lu2O3 ceramic was developed using nanocrystalline technology and a nonpress vacuum sintering method. Spectroscopic properties of this ceramic laser material were investigated. At room temperature under single-laser diode pumping, efficient continuous wave laser oscillation was demonstrated at two wavelengths of the 4F3/2→4I11/2 channel. The potential application of such a laser material was also discussed.
Optics Express | 2003
Akira Shirakawa; K. Takaichi; Hideki Yagi; J. Lu; Mitsuru Musha; Ken-ichi Ueda; T. Yanagitani; T. S. Petrov; Alexander A. Kaminskii
We report a diode-pumped passively mode-locked Yb(3+):Lu(2)O(3) ceramic laser by use of a semiconductor saturable absorber mirror. Almost transform-limited 357 fs pulses at the center wavelength of 1033.5 nm with a maximum average power of 352 mW are obtained. The efficiency against the absorbed pump power is as high as 32% by use of a laser-diode pumping and the repetition rate is 97 MHz. This is the first demonstration of a diode-pumped mode-locked Yb(3+):Lu(2)O(3) ceramic laser to our knowledge.
Japanese Journal of Applied Physics | 2002
Jianren Lu; K. Takaichi; T. Uematsu; Akira Shirakawa; Mitsuru Musha; Ken-ichi Ueda; Hideki Yagi; Takagimi Yanagitani; Alexander A. Kaminskii
A new solid-state laser based on Yb3+-doped highly transparent nanocrystalline yttria (Y2O3) ceramics was developed. At room temperature and under a pump power of 2.63 W from a single InGaAs laser diode at ≈ 0.94 µm, a continuous-wave laser output of 0.47 W at 1.077 µm wavelength was obtained corresponding to a slope efficiency of about 32%. Some main spectroscopic properties of Yb3+:Y2O3 ceramics were also investigated.
Optics Letters | 2009
Feng-Lei Hong; Mitsuru Musha; Masao Takamoto; Hajime Inaba; Shinya Yanagimachi; Akifumi Takamizawa; Ken-ichi Watabe; Takeshi Ikegami; Michito Imae; Yasuhisa Fujii; Masaki Amemiya; Ken'ichi Nakagawa; Ken-ichi Ueda; Hidetoshi Katori
We demonstrate a precision frequency measurement using a phase-stabilized 120 km optical fiber link over a physical distance of 50 km. The transition frequency of the (87)Sr optical lattice clock at the University of Tokyo is measured to be 429228004229874.1(2.4) Hz referenced to international atomic time. The results demonstrate the excellent functions of the intercity optical fiber link and the great potential of optical lattice clocks for use in the redefinition of the second.
International Journal of Modern Physics D | 1999
Kazuaki Kuroda; Masatake Ohashi; Shinji Miyoki; Daisuke Tatsumi; Shuichi Sato; Hideki Ishizuka; Masa Katsu Fujimoto; Seiji Kawamura; Ryutaro Takahashi; Toshitaka Yamazaki; Koji Arai; Mitsuhiro Fukushima; Koichi Waseda; Souichi Telada; Akitoshi Ueda; T. Shintomi; Akira Yamamoto; Toshikazu Suzuki; Yoshio Saito; T. Haruyama; Nobuaki Sato; Kimio Tsubono; Keita Kawabe; Masaki Ando; Ken-ichi Ueda; Hitoki Yoneda; Mitsuru Musha; Norikatsu Mio; Shigenori Moriwaki; Akito Araya
We present here the Large-scale Cryogenic Gravitational wave Telescope (LCGT) project which is aimed to improve the sensitivity of the existing gravitational wave projects by ten times. LCGT is the project constructing the km-scale gravitational wave detector in Japan succeeding the TAMA project, which adopts cryogenic mirrors with a higher power laser. We are planing to build it in an underground site in Kamioka mine. If its target sensitivity is attained, we will be able to catch a few events per month.
Applied Physics Letters | 2003
J. Lu; J.-F. Bisson; K. Takaichi; T. Uematsu; Akira Shirakawa; Mitsuru Musha; Ken-ichi Ueda; H. Yagi; T. Yanagitani; A. A. Kaminskii
A solid-state laser material based on highly transparent Yb3+-doped scandia (Sc2O3) ceramic was developed using nanocrystalline technology and the nonpress vacuum sintering method. Continuous wave laser oscillations were obtained at around 1041 and 1094 nm using a 2.5 at. % Yb3+:Sc2O3 ceramic plate. Broadband lasing spectra were observed.
Optics Express | 2008
Mitsuru Musha; Feng-Lei Hong; Ken'ichi Nakagawa; Ken-ichi Ueda
Optical frequency at 1542 nm was coherently transferred over a 120-km-long installed telecom fiber network between two cities (Tsukuba and Tokyo) in Japan separated by more than 50 km. The phase noise induced by the fiber length fluctuations was actively reduced by using a fiber stretcher and an acousto-optic modulator. The fractional frequency instability of the one-way transmitted light was reduced down to less than 8.0 x 10(-16) at an averaging time of 1s, which is limited by the theoretical limit deduced from the length and the intrinsic noise of the fiber.
Optics Letters | 2006
Jianlang Li; Ken-ichi Ueda; Mitsuru Musha; Akira Shirakawa; Lan-xiang Zhong
For the first time to our knowledge, a radially polarized beam is generated in an Yb-doped multimode double-clad fiber laser by using an intracavity dual conical prism. Up to 6.2 mW of output power is obtained from a 2 m long gain fiber with 7.4% slope efficiency. This research opens a new window to obtaining a radially polarized beam directly from an active fiber.
Crystallography Reports | 2003
A. A. Kaminskii; M. Sh. Akchurin; V. I. Alshits; Ken-ichi Ueda; K. Takaichi; J. Lu; T. Uematsu; Mitsuru Musha; A. Shirikawa; V. Gabler; Hans Joachim Eichler; H. Yagi; T. Yanagitani; S N Bagayev; Jose J. Fernandez; Rolindes Balda
Microhardness and fracture toughness of highly transparent Y3Al5O12-and Y3Al5O12: Nd3+-based nanocrystalline ceramics are measured for the first time. For the Y3Al5O12: Nd3+ laser ceramics, the use of a longitudinal scheme with a diode-laser pumping at a wavelength of 1.3186 mm (4F3/2 → 4I13/2 channel) enabled one to attain an output power of continuous-wave lasing of ∼3.7 W with 35% efficiency.
Optical Materials | 1997
A. A. Kaminskii; A V Butashin; Hans Joachim Eichler; D. Grebe; R. Macdonald; Ken-ichi Ueda; Hajime Nishioka; W. Odajima; M. Tateno; J. Song; Mitsuru Musha; Sergei N. Bagaev; A. A. Pavlyuk
Abstract The nonlinear optical properties of a ferroelectric and ferroelastic β′-Gd2(MoO4)3 laser crystal-host were studied by second harmonic generation (SHG) and stimulated Raman scattering (SRS) experiments using different laser sources for excitation. It is shown that the investigated crystals are very attractive for SHG with IR CW lasers as well as for continuously tunable SHG under illumination with a femtosecond hyper-continuum light source. Furthermore, up to five Stokes and five anti-Stokes lines have been obtained in picosecond SRS experiments with a total conversion efficiency of about 70%. Interaction of SHG and SRS, as well as a new effect, which may be called quasi-hyper SRS, have been observed with insulating crystal for the first time. We classify the β′-Gd2(MoO4)3:Nd as a promising laser medium for pulsed and CW self-frequency doubling lasers.