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Volume 43, Issue 8
Topical Papers on Further Expansion of Ultrafast Frequency Resources
Displaying 1-9 of 9 articles from this issue
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Topical Papers on Further Expansion of Ultrafast Frequency Resources
Topical Paper
Laser Review
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Fumihiko KANNARI2015 Volume 43 Issue 8 Pages 504-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSDownload PDF (695K) -
Takayoshi KOBAYASHI, Yuichiro KIDA, Kotaro OKAMURA, Liu JUN2015 Volume 43 Issue 8 Pages 506-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe generated sub-3-fs visible (Vis)-near-infrared (NIR) pulses by three-wave mixing and sub-10-fs ultraviolet (UV) and deep ultraviolet (DUV) pulses with high contrast suited for the application to ultrafast spectroscopy.View full abstractDownload PDF (1768K) -
Takao FUJI , Yutaka NOMURA2015 Volume 43 Issue 8 Pages 512-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSCarrier-envelope phase (CEP) of single-cycle pulses generated by using four-wave difference frequency mixing has been investigated. The waveforms of the single-cycle pulses generated through two-color filamentation were characterized by using frequency-resolved optical gating capable of CEP determination. We have observed a particular behavior of the phase: the phase of high frequency components of the generated pulses changes continuously and linearly with the relative phase between the two-color input pulses, whereas the phase of the low frequency components takes only two discrete values. The transition of the phase behavior has been clearly observed in the experiment, and reproduced by a numerical simulation. We have found out that such a phase behavior is a unique feature of singlecycle pulses generated with a passive CEP stabilization scheme.View full abstractDownload PDF (778K) -
Chiaki OHAE, Nurul Sheeda SUHAIMI, Trivikramarao GAVARA, Kenichi N ...2015 Volume 43 Issue 8 Pages 517-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe generate phase-locked five harmonics, 2403, 1201, 801, 600, and 480 nm, in the optical frequency region by employing a method of frequency division. The generated harmonics have a wide frequency spacing of 125 THz including the fundamental mode that can generate ultrahigh-repitition-rate arbitrary optical waveforms in the continuous generation regime.View full abstractDownload PDF (576K) -
Norihiko NISHIZAWA, Hiroyuki KAWAGOE, Masahito YAMANAKA, Shutaro ISH ...2015 Volume 43 Issue 8 Pages 521-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSInvestigations of ultrahigh resolution optical coherence tomography (UHR-OCT) using fiber laser supercontinuum (SC) are reviewed based on author’s works. The ultrahigh axial resolution and high sensitive imaging was demonstrated with SC at 0.8 μm. The deep imaging was achieved with 1.7 μm SC based on carbon nanotube fiber laser. In order to investigate the wavelength dependence of imaging, the SCs were generated at 5 different wavelengths, and the UHR-OCT imaging was demonstrated at each wavelength. Finally, recent progress and future prospect were discussed briefly.View full abstractDownload PDF (1392K) -
Yasutake OHISHI2015 Volume 43 Issue 8 Pages 526-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSThis paper describes a new prospect for mid-infrared supercontinuum generation. Such non-silica soft glass materials as fluoride, tellurite and chalcogenide glass, all of which are transparent up to the midinfrared range, are used as fiber materials. We successfully fabricated microstructured optical fibers made of tellurite and chalcogenide glass to control chromatic dispersion and showed that highly nonlinear soft glass microstructured optical fibers are promising as mid-infrared supercontinuum generation media.View full abstractDownload PDF (2426K) -
Satoshi ASHIHARA2015 Volume 43 Issue 8 Pages 532-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSMid-infrared (MIR) ultrashort pulses have been successfully applied to nonlinear vibrational spectroscopy and have proved useful in unravelling structural/vibrational dynamics of molecular systems. MIR pulses might also provide a powerful tool to control the dynamics/reaction of matter at the electronic ground state and to drive strong-field phenomena. Here we present techniques of coherent spectral expansion and waveform shaping in MIR, both of which are important for light-matter control experiments, and an example where the pulse shaping is applied to vibrational ladder climbing.View full abstractDownload PDF (1076K)
Laser Original
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Masanori KAKU, Masahito KATTO, Atsushi YOKOTANI, Shoichi KUBODERA2015 Volume 43 Issue 8 Pages 537-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSWe have constructed the ultrashort pulse vacuum ultraviolet (VUV) laser system with an optical-fieldinduced ionization (OFI) Ar2* amplifier. The amplification properties of the OFI Ar2* amplifier were evaluated. A gain-length product of 0.84 was obtained by using multi-pass amplification with a VUV cavity. The gain-length product was increased up to 4.3 through the use of single-pass amplification with a VUV reflector and a hollow fiber. We optimized temporal and spatial overlaps between a VUV seed pulse generated as the 7th harmonic radiation and the OFI Ar2* amplifier. The optimal injection time of the seed pulse into the OFI Ar2* amplifier was 20 ns, which agreed with a peak time of Ar2* spontaneous emission. The spatially-resolved amplification of VUV seed pulses at 126 nm was observed in an OFI Ar2* amplifier. The maximum amplification ratio of 3.1 was observed, which corresponded to a gain value of 1.17 cm-1.View full abstractDownload PDF (1118K) -
Yun ZHANG, Daichi YAMAGUCHI, Chuangtian CHEN, Shuntaro WATANABE, Ma ...2015 Volume 43 Issue 8 Pages 542-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL FREE ACCESSIn this paper, we describe the development of a system to generate quasi-continuous wave coherent light at vacuum ultraviolet wavelengths, targeting the light at wavelength of 160 nm with a KBBF crystal. It consists of sequential wavelength conversion stages containing second harmonic generation (SHG) and sum-frequency generation. In the first SHG stage, light at 400 nm with a power of more than 900 mW and a stability of more than 1 hour was obtained by exploiting an enhanced cavity. And, light at 200 nm with a power of 5.7 mW and a stability of more than 3 hour was also observed, in the second stage, by single pass SHG with a KBBF-PCD. We aim to generate 160-nm light with a power level of μW in the final stage.View full abstractDownload PDF (1087K)
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