High intensity, high temporal contrast, high repetition-rate laser for laser driven particle acceleration

Suzuki, Masayuki; Kiriyama, Hiromitsu; Daito, Izuru; Okada, Hajime; Ochi, Yoshihiro; Sato, Masatoshi*; Yoshii, Takehiro*; Tamaoki, Yoshinori*; Maeda, Junya*; Matsuoka, Shinichi*; et al.

AIP Conference Proceedings 1465, p.53 - 57, 2012/07

https://doi.org/10.1063/1.4737539

We have reported hundred mJ level, femtosecond pulse duration with the high temporal contrast in an OPCPA/Yb:YAG ceramic thin disk laser system at 10 Hz repetition rate. At an input laser pulse energy of 3.8 mJ from the OPCPA preamplifer the output energy of 130 mJ with spectral bandwidth of 2.5 nm has been obtained from multipass Yb:YAG ceramic thin disk amplifier, and the optical efficiency from LD energy to amplified laser pulse is 9.6%. The recompressed laser pulse duration was measured to be 450 fs. Because the compressor efficiency exceeds 73% the compressed pulse energy can potentially be as high as 95 mJ. The contrast level of this laser pulse was measured to be less than 7.210 at -150 ps. This novel laser system after further amplification using additional amplifiers can be useful for the laser-driven proton acceleration in future.

Hundred mJ, sub-picoseconds, high temporal contrast OPCPA/Yb:YAG ceramic thin disk hybrid laser system

Suzuki, Masayuki*; Kiriyama, Hiromitsu; Daito, Izuru; Ochi, Yoshihiro; Okada, Hajime; Sato, Masatoshi*; Tamaoki, Yoshinori*; Yoshii, Takehiro*; Maeda, Junya*; Matsuoka, Shinichi*; et al.

Applied Physics B, 105(2), p.181 - 184, 2011/11

https://doi.org/10.1007/s00340-011-4752-4

We have demonstrated an OPCPA/Yb:YAG ceramic thin disk hybrid laser system having hundred mJ level pulse energy sub-picosecond pulse duration with high temporal contrast. At an input energy of 3.8 mJ from an OPCPA preamplifier an output energy of 130 mJ was obtained from Yb:YAG ceramic thin disk amplifier. A recompressed pulse duration of 450 fs with a contrast level of less than 7.210 was obtained. The contrast level is the highest value achieved in Yb:YAG chirped pulse amplification (CPA) laser system with hundred mJ level.

The Thermal stability of tertiary pyridine resin for the application to multi-functional reprocessing process; Adv.-ORIENT cycle development

Sato, Yoshihiko*; Okada, Ken*; Akiyoshi, Miyako*; Matsunaga, Takehiro*; Suzuki, Tatsuya*; Koyama, Shinichi; Ozawa, Masaki

Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM), p.962 - 969, 2009/09

The fundamental thermochemical properties of tertiary pyridine resin (TPR) and its mixtures with methanol/HCl and HNO were investigated and heating tests on gram scale with TPR/methanol/HNO were carried out. It was found that TPR with HCl was thermally stable. Evident thermal decomposition peaks were identified with TPR in the presence of concentrated HNO. No specific effect was observed for methanol involving. However, it was considered that the rapidly exothermic reaction can be controlled by heating temperature.

Computer code WAGEN for the generation of artifical earthquake ground motions

; Suzuki, Takehiro*; *

JAERI-M 88-206, 20 Pages, 1988/10

JAERI-M-88-206.pdf:0.55MB

no abstracts in English

Study on thermal stability of tertiary pyridine resin, 1; Basic thermochemical properties of resin/methanol/nitric acid, htdrochloric acid system

Sato, Yoshihiko*; Okada, Ken*; Akiyoshi, Miyako*; Matsunaga, Takehiro*; Suzuki, Tatsuya*; Koyama, Shinichi; Ozawa, Masaki

no journal, , 

Fundamental experiment for thermal stability of tertiary pyridine resin was performed by the condition of resin/methanol/nitric acid and hydrochloric acid systems as a part of development for advanced ORIENT cycle.

Development of broadband nonlinear preamplifier for laser-diode-pumped Yb:YAG CPA laser system

Suzuki, Masayuki; Kiriyama, Hiromitsu; Daito, Izuru; Okada, Hajime; Sato, Masatoshi*; Yoshii, Takehiro*; Tamaoki, Yoshinori*; Maeda, Junya*; Matsuoka, Shinichi*; Kan, Hirofumi*; et al.

no journal, , 

We have demonstrated amplification of 1030 nm broadband chirped-pulses from an ytterbium (Yb) femtosecond oscillator to over 6.5 mJ with a total gain of greater than 10 achieved by a single pass through only 56 mm of gain material at a 10 Hz repetition rate. The amplified broad bandwidth of 10.8 nm affords recompression to a 230 fs pulse duration following amplification. This novel system is a promising alternative to the RA as a nonlinear preamplifier for compact, high intensity, Yb:YAG CPA laser using DPPSL systems.

Study on thermal stability of tertiary pyridine resin, 4; Gram scale thermal analysis using glass vessel

Okada, Ken*; Sato, Yoshihiko*; Akiyoshi, Miyako*; Matsunaga, Takehiro*; Suzuki, Tatsuya*; Koyama, Shinichi; Ozawa, Masaki

no journal, , 

As a part of Adv.-ORIENT cycle technologies which aim to develop new fuel cycle based on FBR, the fundamental thermochemical properties of tertiary pyridine type resin and its mixtures with methanol, HCl and HNO were investigated. It was found that the exothermic reaction at 150C was observed under mixture of the resin and HNO without Methanol and HO.

Status and plan of ITER diagnostics development

Kusama, Yoshinori; Kawano, Yasunori; Sugie, Tatsuo; Kondoh, Takashi; Ogawa, Hiroaki; Hatae, Takaki; Sato, Kazuyoshi; Suzuki, Satoshi; Hayashi, Toshimitsu; Ono, Takehiro; et al.

no journal, , 

no abstracts in English

High intensity, high contrast OPCPA/Yb:YAG hybrid laser system

Suzuki, Masayuki; Kiriyama, Hiromitsu; Daito, Izuru; Okada, Hajime; Nakai, Yoshiki*; Daido, Hiroyuki; Bolton, P.; Sugiyama, Akira; Kondo, Kiminori; Kawanishi, Shunichi; et al.

no journal, , 

At our Institute we are developing a compact ion accelerator for cancer therapy using a laser-driven plasma point source of ions. The laser system was consisted of an oscillator, offner stretcher, optical parametric amplifier (OPCPA), LD pumped Yb:YAG amplifier, and compressor. In OPCPA the stretched laser pulse after the pulse stretcher was amplified to 5 mJ with only a 0.2 mJ input. After amplification in the OPCPA laser pulse was further amplified by an Yb:YAG (5 at%) thin disk module which was pumped by the Q-CW LD. The maximum output energy was about 120 mJ in a multi-pass scheme (20 pass) at 10 Hz. The compressed pulse duration is about 300 fs, and the contrast level before the main pulse is measured as 10 at -150 ps. We have developed that new high intensity, high contrast femtosecond OPCPA/LD-pumped Yb:YAG hybrid laser system. This novel system might represent the driver in integrated, laser-driven ion accelerator systems.

Hundred mJ level, high contrast OPCPA/Yb:YAG hybrid laser system

Suzuki, Masayuki; Kiriyama, Hiromitsu; Daito, Izuru; Okada, Hajime; Bolton, P.; Sugiyama, Akira; Kondo, Kiminori; Kawanishi, Shunichi*; Sato, Masatoshi*; Tamaoki, Yoshinori*; et al.

no journal, , 

At our Institute we are developing a compact ion accelerator for cancer therapy using a laser-driven plasma point source of ions. The laser system was consisted of an oscillator, Offner stretcher, optical parametric amplifier (OPCPA), LD pumped Yb:YAG amplifier, and compressor. In OPCPA the stretched laser pulse after the pulse stretcher was amplified to 3.8 mJ with only a 12.8 nJ input. After amplification in the OPCPA laser pulse was further amplified by an Yb:YAG thin disk module which was pumped by the Q-CW LD. The maximum output energy was about 80 mJ in a multi-pass scheme (20 pass) at 10 Hz. The compressed pulse duration is about 520 fs, and the contrast level before the main pulse is measured as 10 at -150 ps. We have developed that new high intensity, high contrast femtosecond OPCPA/LD-pumped Yb:YAG hybrid laser system. This novel system might represent the driver in integrated, laser-driven ion accelerator systems.