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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:31.85(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:70.17(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:38 Percentile:84.44(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:80 Percentile:93.53(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:44 Percentile:83.91(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:50 Percentile:88.25(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$$^{4}$$.

34 (Records 1-20 displayed on this page)