The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 30, Issue 7
Displaying 1-9 of 9 articles from this issue
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Topical Papers on Terahertz Electromagnetic Radiation and Its Application
Topical Papers
Laser Reviews
  • Preface to Topical Papers on Terahertz Electromagnetic Radiation and Its Application
    Masanori HANGYO
    2002 Volume 30 Issue 7 Pages 352
    Published: July 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.352
    JOURNAL FREE ACCESS
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  • Photoconductive Detection of Ultrabroadband Terahertz Radiation from Semiconductors
    Shunsuke KONO, Masahiko TANI, Kiyomi SAKAI
    2002 Volume 30 Issue 7 Pages 353-359
    Published: July 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.353
    JOURNAL FREE ACCESS
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    Broadband detection of terahertz radiation with a photoconductive (PC) antenna fabricated on low-temperature-grown GaAs (LT-GaAs) is reported. The detection of up to 60 THz with an LT-GaAs PC antenna gated with 15 fs laser pulses is demonstrated. The spectral response of the PC antenna is compared with that of electro-optic sampling technique. The frequency response of the PC antenna is found to be determined by the temporal profile of the carrier number. The detectable bandwidth of the PC antenna is investigated in terms of the gating pulse width. The potential bandwidth of the PC antenna is found to be broader than reported before even with the gating pulse width of 45 fs.
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  • Intense THz Radiation from Semiconductors in a Magnetic Field and Its Application
    Hideyuki OHTAKE, Nobuhiko SARUKURA
    2002 Volume 30 Issue 7 Pages 360-364
    Published: July 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.360
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    We have generated enhanced THz-radiation from a femtosecond laser irradiating semiconductor in a magnetic field with a shallow incidence angle. The average power of THz-radiation has reached approximately 100 μW. Using intense THz radiation, a simple, noncontact, simultaneous method is applied to measure thickness and water content of black ink films independently from frequency-dependent and frequency-independent absorption characteristics of black ink films.
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  • Widely Tunable Terahertz Electromagnetic Radiation by Nonlinear Optical Effect
    Tetsuo TANIUCHI, Jun-ichi SHIKATA, Hiromasa ITO
    2002 Volume 30 Issue 7 Pages 365-369
    Published: July 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.365
    JOURNAL FREE ACCESS
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    A coherent terahertz (THz) wave can be generated by difference frequency generation (DFG) using nonlinear optical crystals. DFG has a potential advantage of wide tunability achieved by a proper selection of the DFG crystal and input wavelengths. In this paper, we present the latest progress in widely tunable THz-wave generation from 0.3 to 6.5 THz using DAST crystals. As a dual-wavelength light source for DFG, we employed a KTP optical parametric oscillator in the 1100-1200 nm range pumped at 532 nm. Using a thick DAST crystal more than 1 mm, maximun THz-frequency was limited to 0.6 THz. However, using thin DAST crystals less than 0.3 mm, a peak power of more than 10 mW were successfully generated at 2.5 and 4.3 THz. In spite of the present nanosecond-pulse operation, a compact system of widely tunable THz-waves, including a diode-pumped Q switched Nd:YAG laser and a pyroelectric detector, could be useful in THz-imaging and spectroscopic applications.
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  • Terahertz Radiation from Strongly Correlated Electron Systems and Related Phenomena
    Masayoshi TONOUCHI, Noriaki KIDA, Toshihiko KIWA, Yukihiro TOMINARI, I ...
    2002 Volume 30 Issue 7 Pages 370-375
    Published: July 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.370
    JOURNAL FREE ACCESS
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    We review the study on terahertz (THz) beam generation from strongly correlated electron systems; Pr0.7Ca0.3MnO3(PCMO), Tl2Ba2CaCu2O8+δ (Tl2212), and Bi2Sr2CaCu2O8+δ (Bi2212) thin films. Remarkable difference in thier emission properties and those from semiconductors or YBa2Cu3O7-δ (YBCO) is observed. The ultrafast carrier dynamics in the optically excited YBCO thin films is also discussed on the basis of its THz emission properties. Furhtermore, we report new results on the THz time domain spectroscopic studies of PCMO, La0.7Ca0.3MnO3, Bi2212, and SrBi2Ta2O9 thin films.
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  • Terahertz Time Domain Spectroscopy and Imaging
    Kiyomi SAKAI, Masanori HANGYO
    2002 Volume 30 Issue 7 Pages 376-384
    Published: July 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.376
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    The technology of generating terahertz electromagnetic pulses from various devices and materials by exciting them with ultrashort laser pulses has recently made a remarkable progress. This technology has been applied to spectroscopy and imaging. In this paper, the various methods of spectroscopy, imaging and their application to various samples are described.
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  • Ultrahigh Sensitivity Detection of Terahertz Waves Using Quantum Dots
    Susumu KOMIYAMA, Oleg ASTAFIEV, Takeshi KUTSUWA
    2002 Volume 30 Issue 7 Pages 385-390
    Published: July 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.385
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    Single-photon detection of THz waves is realized by using two kinds of detectors. The first type of detector exploits a semiconductor lateral quantum dot in magnetic fields. The quantum dot is operated as a single electron transistor (SET) to detect individual events of THz-photon absorption (1.5 THz-1.9 THz) due to cyclotron-resonance induced intra-dot polarization. The second type detector utilizes parallel double quantum dots, in which one of the quantum dots serve as an SET while the other quantum dot affects the SET conductance when it is ionized by a THz photon absorption (about 0.5 THz). The detector performance is described. A future perspective for further improvements of the detectors is also briefly given.
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Laser Original
Regular Papers
Laser Original
  • Artistic Plastic-Material Processing by a Segmented Pixel Drawing Method Using a Slab CO2 Laser
    Noriyo SAKURADA, Yoshio ISHII, Yuzuru KUBOTA, Kazuhiro WATANABE
    2002 Volume 30 Issue 7 Pages 396-400
    Published: July 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.396
    JOURNAL FREE ACCESS
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    A segmented pixel drawing method has been developed in order to create a tasteful artistic work for plastic materials. With this method, various artistic tastes were successfully realized on transparent plastics by combinations of visual effects and tones using a slab CO2 laser which was operated in a segmented pixel-base scheme. A relationship of the system controlling parameters with the visual effects and tones has been quantitatively analyzed in terms of 3-visual effects and 8-tones which have been experimentally obtained. Tasteful artistic works have been interestingly printed on acrylic materials from digital images. Discussions on the evaluation for the printing effects and the detailed system configuration are given from the viewpoint of a viable laser sculpture system.
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