Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 32

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Bandwidth enhancement of optical parametric chirped pulse amplification by temporally delayed two pump beams

Ogawa, Kanade; Aoyama, Makoto; Akahane, Yutaka; Tsuji, Koichi; Kawanaka, Junji*; Harimoto, Tetsuo*; Nishioka, Hajime*; Fujita, Masayuki*; Yamakawa, Koichi

Japanese Journal of Applied Physics, 47(6), p.4592 - 4594, 2008/06

 Times Cited Count:7 Percentile:30.12(Physics, Applied)

We have demonstrated ultra-broadband optical parametric chirped-pulse amplification of more than 350 nm bandwidth in a near infrared region. We have observed a substantial enhancement (nearly 2-fold) of the parametric amplification bandwidth by using time delayed two broadband pump pulses at degeneracy.

Journal Articles

Ultra-broadband optical parametric chirped-pulse amplification with a diverged pump beam

Ogawa, Kanade; Akahane, Yutaka; Harimoto, Tetsuo*; Aoyama, Makoto; Tsuji, Koichi; Kawanaka, Junji*; Nishioka, Hajime*; Fujita, Masayuki*; Yamakawa, Koichi

Reza Kenkyu, 35(9), p.596 - 598, 2007/09

no abstracts in English

Journal Articles

Multi-millijoule, diode-pumped, cryogenically-cooled Yb:KY(WO$$_{4}$$)$$_{2}$$ chirped-pulse regenerative amplifier

Ogawa, Kanade; Akahane, Yutaka; Aoyama, Makoto; Tsuji, Koichi; Tokita, Shigeki*; Kawanaka, Junji*; Nishioka, Hajime*; Yamakawa, Koichi

Optics Express (Internet), 15(14), p.8598 - 8602, 2007/07

 Times Cited Count:21 Percentile:68.24(Optics)

Ytterbium (Yb$$^{3+}$$) doped gain media are one of promising laser materials for the next generation of diode-pumped high-power lasers. Yb-doped media have several advantages. It has wide absorption bandwidth, the low quantum defect, and the simple electronic structure. Yb:KY(WO$$_{4}$$)$$_{2}$$ (Yb:KYW) and Yb:KG(WO$$_{4}$$)$$_{2}$$ (Yb:KGW) have a large absorption and wide emission cross section, broad emission spectral range, and high thermal conductivity, yielding a high repetition-rate, high-energy, sub-picosecond pulses. However, multi-millijoule-class Yb:KYW or Yb:KGW lasers have not yet been reported so far, excepting a massive, joule-class Ti:sapphire laser pumped Yb:KGW regenerative amplifier. So, We developed a compact diode-pumped, cryogenically-cooled chirped-pulse Yb:KYW regenerative amplifier. An amplified pulse with an energy of 5.5 mJ and a high optical conversion efficiency of $$sim$$14% is achieved. Regenerative pulse shaping is also used to counter gain narrowing during amplification.

Journal Articles

High-energy, diode-pumped, picosecond Yb:YAG chirped-pulse regenerative amplifier for pumping optical parametric chirped-pulse amplification

Akahane, Yutaka; Aoyama, Makoto; Ogawa, Kanade; Tsuji, Koichi; Tokita, Shigeki*; Kawanaka, Junji*; Nishioka, Hajime*; Yamakawa, Koichi

Optics Letters, 32(13), p.1899 - 1901, 2007/07

 Times Cited Count:40 Percentile:83.87(Optics)

A diode-pumped, cryogenic-cooled Yb:YAG regenerative amplifier utilizing gain-narrowing has been developed. A 1.2-ns chirped-seed pulse was amplified and compressed in the regenerative amplifier, simultaneously, which generated a 35-ps pulse with $$sim$$8-mJ of energy without a pulse compressor. Second-harmonics of the amplified pulse was used to pump picosecond two-color optical parametric amplification.

Journal Articles

Degenerate optical parametric chirped-pulse amplifier pumped by an Yb:YLF chirped-pulse amplification laser

Aoyama, Makoto; Akahane, Yutaka; Ogawa, Kanade; Tsuji, Koichi; Sugiyama, Akira; Harimoto, Tetsuo*; Kawanaka, Junji*; Nishioka, Hajime*; Fujita, Masayuki*; Yamakawa, Koichi

Reza Kenkyu, 35(6), p.398 - 399, 2007/06

We have demonstrated optical parametric chirped-pulse amplification by using a diode-pumped Yb:YLF CPA laser system as a pump source and achieved an ultra-broadband amplification of over 200-nm supporting a 12.6-fs duration (3.7 optical cycles) in spite of being operated around degeneracy. By using a two-stage OPCPA with a higher-energy pump pulse, it should be able to produce a terawatt-class, few-cycle laser pulse without complexly and enlarging the system size. Such a laser is useful for the generation of attosecond pulse generation in the xuv region as well as other high field applications.

Journal Articles

All solid-state ultrashort-pulse laser by using ytterbiumu-doped materials

Nishioka, Hajime*; Kawanaka, Junji

Hikari Araiansu, 14(11), p.21 - 25, 2003/11

no abstracts in English

Journal Articles

30-mJ, diode-pumped, chirped-pulse Yb:YLF regenerative amplifier

Kawanaka, Junji; Yamakawa, Koichi; Nishioka, Hajime*; Ueda, Kenichi*

Optics Letters, 28(21), p.2121 - 2123, 2003/11

 Times Cited Count:86 Percentile:93.7(Optics)

no abstracts in English

Journal Articles

Improved high-field laser characteristics of a diode-pumped Yb:LiYF$$_{4}$$ crystal at low temperature

Kawanaka, Junji; Yamakawa, Koichi; Nishioka, Hajime*; Ueda, Kenichi*

Optics Express (Internet), 10(10), p.455 - 460, 2002/05

 Times Cited Count:48 Percentile:84.91(Optics)

no abstracts in English

Journal Articles

24-mJ, diode-pumped, chirped-pulse regenerative amplifier with a cooled Yb:LiYF$$_{4}$$

Kawanaka, Junji; Yamakawa, Koichi; Nishioka, Hajime*; Ueda, Kenichi*

Proceedings of Conference on Lasers and Electro-Optics / Quantum Electronics and Laser Science Conference (CLEO/QELS 2002), p.CPDC8_1 - CPDC8_3, 2002/00

no abstracts in English

Journal Articles

Tunable continuous-wave Yb:YLF laser operation with a diode-pumped chirped-pulse amplification system

Kawanaka, Junji; Nishioka, Hajime*; Inoue, Norihiro*; Ueda, Kenichi*

Applied Optics, 40(21), p.3542 - 3546, 2001/07

 Times Cited Count:55 Percentile:89.07(Optics)

no abstracts in English

Journal Articles

Energy extraction performance for a diode-pumped CPA system in Yb-doped materials at low temperature

Kawanaka, Junji; Nishioka, Hajime*; Inoue, Norihiro*; Kubota, Yoshinori*; Ueda, Kenichi*

XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference (Proceedings of SPIE Vol.4184) (CD-ROM), 4 Pages, 2000/09

no abstracts in English

Oral presentation

Ultrabroadband optical parametric chirped-pulse amplification system, 1; Cryogenically-cooled Yb:YLF CPA pump laser

Akahane, Yutaka; Aoyama, Makoto; Tsuji, Koichi; Kawanaka, Junji*; Nishioka, Hajime*; Yamakawa, Koichi

no journal, , 

no abstracts in English

Oral presentation

Development of high-intensity few-cycle optical parametric chirped-pulse amplifiers pumped by an Yb:YLF chirped-pulse amplification laser

Aoyama, Makoto; Akahane, Yutaka; Tsuji, Koichi; Ogawa, Kanade; Harimoto, Tetsuo*; Kawanaka, Junji*; Nishioka, Hajime*; Fujita, Masayuki*; Yamakawa, Koichi

no journal, , 

no abstracts in English

Oral presentation

High-intensity few-cycle optical parametric chirped-pulse amplification system

Aoyama, Makoto; Akahane, Yutaka; Ogawa, Kanade; Tsuji, Koichi; Harimoto, Tetsuo*; Kawanaka, Junji*; Nishioka, Hajime*; Fujita, Masayuki*; Yamakawa, Koichi

no journal, , 

no abstracts in English

Oral presentation

Ultrabroadband optical parametric chirped-pulse amplification system, 1; System overview

Aoyama, Makoto; Akahane, Yutaka; Ogawa, Kanade; Tsuji, Koichi; Harimoto, Tetsuo*; Kawanaka, Junji*; Nishioka, Hajime*; Fujita, Masayuki*; Yamakawa, Koichi

no journal, , 

no abstracts in English

Oral presentation

Ultrabroadband optical parametric chirped-pulse amplification system, 2; Cryogenically-cooled Yb-doped solid-state CPA pump laser

Akahane, Yutaka; Aoyama, Makoto; Ogawa, Kanade; Tsuji, Koichi; Tokita, Shigeki*; Kawanaka, Junji*; Nishioka, Hajime*; Yamakawa, Koichi

no journal, , 

no abstracts in English

Oral presentation

High-energy, cryogenic-cooled Yb:YAG chirped-pulse regenerative amplifier as an efficient picosecond OPCPA pump source

Akahane, Yutaka; Aoyama, Makoto; Ogawa, Kanade; Tsuji, Koichi; Tokita, Shigeki*; Kawanaka, Junji*; Nishioka, Hajime*; Yamakawa, Koichi

no journal, , 

A diode-pumped Yb:YAG regenerative amplifier utilizing gain-narrowing has been developed. A chirped-seed pulse was amplified and compressed in the regenerative amplifier, simultaneously, which generated the picosecond pulses with 8 mJ of energy without a pulse compressor.

Oral presentation

Multi-millijoule pulse amplification in a diode-pumped Yb:KY(WO$$_{4}$$)$$_{2}$$ chirped-pulse regenerative amplifier

Aoyama, Makoto; Ogawa, Kanade; Akahane, Yutaka; Tsuji, Koichi; Tokita, Shigeki*; Kawanaka, Junji*; Nishioka, Hajime*; Yamakawa, Koichi

no journal, , 

no abstracts in English

Oral presentation

Ultrabroadband optical parametric chirped-pulse amplification pumped by Yb:YLF CPA laser

Akahane, Yutaka; Aoyama, Makoto; Ogawa, Kanade; Tsuji, Koichi; Harimoto, Tetsuo*; Kawanaka, Junji*; Nishioka, Hajime*; Fujita, Masayuki*; Yamakawa, Koichi

no journal, , 

no abstracts in English

Oral presentation

High-energy, diode-pumped, picosecond Yb:YAG chirped-pulse regenerative amplifier as a pump source for optical parametric chirped-pulse amplification

Akahane, Yutaka; Aoyama, Makoto; Ogawa, Kanade; Tsuji, Koichi; Tokita, Shigeki*; Kawanaka, Junji*; Nishioka, Hajime*; Yamakawa, Koichi

no journal, , 

We have developed a narrowband Yb:YAG chirped-pulse regenerative amplifier using gain-narrowing, which is suitable for direct OPCPA pumping without pulse compression. A chirped-seed pulse was amplified and compressed in the regen, simultaneously, which generated the picosecond pulses with 7.5-mJ of energy without a pulse compressor. In the experiment, output pulse from a mode-locked oscillator was split into two beams, which were used as seed pulses for both Yb:YAG regen and OPCPA. The seed pulse for the regen was positively chirped to 1.2 ns by a PANDA fiber before amplification. An Yb:YAG was cooled by a liquid-nitrogen cryostat and fiber-coupled laser diode was used to pump the regen. A gain narrowed amplified bandwidth (from 17 nm to 0.5 nm) corresponded to 35 ps (FWHM) duration. We also performed a parametric amplification by using the frequency-doubled, 25-ps pump pulse. We have observed OPA spectra at 850 and 1200 nm, simultaneously, with the maximum OPA gain of 10$$^{4}$$.

32 (Records 1-20 displayed on this page)