S. Matsuoka
Hamamatsu Photonics
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Publication
Featured researches published by S. Matsuoka.
Applied Physics Letters | 2006
You Wang; T. Kasamatsu; Yujin Zheng; Hirofumi Miyajima; Hirotake Fukuoka; S. Matsuoka; Minoru Niigaki; H. Kubomura; Teruo Hiruma; Hirofumi Kan
The experimental demonstration of a broad-area Quasi-continuous-wave (QCW) laser-diode array pumped cesium vapor laser is reported in this letter according to our experimental results. We used a volume-Bragg grating to narrow the spectral linewidth for acquirement of enough resonance transitions. A glass cylindrical cell filled with cesium/buffer gas was set in an end-pumped flat-concave cavity and the gas pressure was set lower than 1atm. Using the QCW drive mode with the repetitive rate and pulse width of 1kHz and 50μs, respectively, 13.45μJ pulse energy has been achieved with the slope efficiency of about ∼1.8%.
Optics Express | 2010
Takashi Sekine; S. Matsuoka; Ryo Yasuhara; Takashi Kurita; Ryuji Katai; Toshiyuki Kawashima; Hirofumi Kan; Junji Kawanaka; Koji Tsubakimoto; Takayoshi Norimatsu; Noriaki Miyanaga; Yasukazu Izawa; T. Kanabe
A diode-pumped joule class in a 10 Hz output Nd:YLF ring amplifier has been developed. A phase conjugate plate was developed as a wavefront corrector for the residual wavefront distortion of an Nd:YLF rod. We have demonstrated a 0.46 J output of 10 ns pulse duration at 10 Hz repetition rate with 1.5 nJ of input energy. The effective gain of the ring amplifier system was 84.8 dB. To our knowledge, this is the highest magnification with joule-level output energy in a single-stage amplifier system that has ever been built. As a preamplifier system, this system contributed a demonstration of 21.3 J in a 10 Hz output diode-pumped Nd:glass zigzag slab laser system with a stimulated Brillouin scattering- phase conjugation mirror. We describe a robust and effective method of wavefront correction for high-energy laser systems.
Advanced Solid-State Photonics (TOPS) (2004), paper 282 | 2004
Toshiyuki Kawashima; O. Matsumoto; Masahiro Miyamoto; Takashi Sekine; Takashi Kurita; S. Matsuoka; Takeshi Kanzaki; Hirofumi Kan; T. Kanabe; Ryo Yasuhara; Y Fukumoto; T Ashizuka; Masanobu Yamanaka; Takayoshi Norimatsu; Noriaki Miyanaga; Masahiro Nakatsuka; Y. Izawa; Hiroyuki Furukawa; Shinji Motokoshi; Chiyoe Yamanaka; Hitoshi Nakano; S. Nakai
A quasi-cw 290-kW diode-pumped zig-zag slab laser is being developed in order to demonstrate a concept of the IFE driver. Thermally managed amplifier has yielded a gain of 10, promising 10-J output at 10 Hz.
conference on lasers and electro optics | 2005
Hisanori Fujita; Anirban Mitra; T. Wang; K. Tsubakimoto; Y. Fijimoto; H. Yoshida; N. Miyanaga; Y. Izawa; S. Matsuoka; H. Kubomura; T. Kasamatsu; Takayuki Uchiyama; Hirofumi Miyajima; H. Kan
We have been developing a high repetition (5 kHz) and high power (5 kW) Nd:YAG laser system for EUV lithography. Key subjects are (1) reliable front-end, (2) uniform and high density pumping of main amplifier rods, and (3) compensation of thermal effects. Fairly good uniformity was achieved by adjusting pumping geometry. Detail system analysis suggests that 8 amplifier modules pumped at 24.0 kW power are required to get output of 5 kW under relatively small thermal effects.
conference on lasers and electro-optics | 2011
M. Murakami; Minoru Yoshida; Hitoshi Nakano; Yasushi Fujimoto; H. Shiraga; Shinji Motokoshi; S. Matsuoka; Junya Maeda; Hirofumi Kan; Tatsuhiro Sato
We demonstrated a laser oscillation in the shortest Nd-doped silica fiber, an only 4-mm multimode Nd-doped silica fiber. This fiber-core glass was fabricated by the zeolite method, and the glass contained 1.25 wt% of Nd2O3.
Journal of Physics: Conference Series | 2008
Takashi Sekine; S. Matsuoka; Toshiyuki Kawashima; H. Kan; Junji Kawanaka; K. Tsubakimoto; Y. Izawa
Wavefront correction until Zernike polynomial of degree three by a phase conjugate plate has been demonstrated in a high-energy Nd:YLF amplifier system. 108, amplification of 380 mJ has been achieved with a near-diffraction-limited beam quality.
conference on lasers and electro optics | 2007
Takashi Sekine; S. Matsuoka; Toshiyuki Kawashima; H. Kan; Junji Kawanaka; K. Tsubakimoto
Wavefront correction until Zernike polynomial of degree three by a phase conjugate plate has been demonstrated in a high-energy Nd:YLF amplifier system. 108 amplification of 380 mj has been achieved with a near-diffraction-limited beam quality.
european quantum electronics conference | 2011
Masayuki Suzuki; Hiromitsu Kiriyama; I. Daito; Hajime Okada; Paul R. Bolton; Akira Sugiyama; Kiminori Kondo; S. Kawanishi; Masatoshi Sato; Yoshinori Tamaoki; Takehiro Yoshii; Junya Maeda; S. Matsuoka; Hirofumi Kan
Yb:YAG CPA have a potential to develop a compact, high peak power at high repetition rates. For high energy pulses of short duration Yb:YAG regenerative amplifiers have mainly been studied for which significant prepulse and amplified spontaneous emission (ASE). In laser proton acceleration studies it is very important to suppress the prepulse and ASE levels, because a preplasma is generated before the peak of the laser pulse, therefore the maximum proton energy is limited. To overcome this problem, the OPCPA can efficiently provide high gain for the main pulse while suppressing prepulse amplification. Here we have first demonstrated a hundred mJ level, femtosecond of an OPCPA/Yb:YAG hybrid laser system with a contrast level of 10−9 at −150 ps.
european quantum electronics conference | 2011
M. Murakami; Minoru Yoshida; Hitoshi Nakano; Yasushi Fujimoto; H. Shiraga; Shinji Motokoshi; S. Matsuoka; Junya Maeda; H. Kan; Tatsuhiro Sato
Short length fiber less than a few centimeters has many attractive applications in information and communication fields, for example, developments of over GHz clocking signals, optical integrated circuit elements.
european quantum electronics conference | 2009
Masayuki Suzuki; Hiromitsu Kiriyama; I. Daito; Hajime Okada; Masatoshi Sato; S. Matsuoka; Yoshinori Tamaoki; T. Yoshii; H. Kan; Paul R. Bolton; Hiroyuki Daido
The broad absorption bandwidth of ytterbium (Yb) is well-suited to laser diode pumping at 940 nm. Because Yb is known for its low quantum defect, thermal loading is significantly reduced. Consequently, Yb doped crystals, especially Yb:YAG, show promise for developing compact, high peak power laser systems at high repetition rates. For high energy pulses of short duration Yb:YAG regenerative amplifiers have mainly been studied where the generation of significant prepulse and amplified spontaneous emission (ASE) is known. At higher intensities (for example ∼ 1018Wcm−2 and beyond) laser-matter interactions can require suppression of prepulse and ASE intensity in order to maintain or control the target state that a short or ultrashort main pulse would irradiate. In many cases it is therefore critical to avoid significant preplasma formation. To solve these problem, the optical parametric chirped pulse amplification (OPCPA) can efficiently provide high gain of the main pulse while suppressing prepulse amplification and reducing gain narrowing of the spectrum. We present in this conference the first Yb femtosecond oscillator based OPCPA demonstration at 1030 nm and with spectral bandwidth adequate for amplifying femtosecond pulses. Direct laser diode (LD) amplification of 1030 nm light makes this OPCPA a feasible preamplifier for a compact, high contrast, energetic, short pulse laser systems that can be considered for development of laser-driven proton accelerators.