All issues
Volume 31, Issue 7
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
Topical Papers on Optical Frequency Standards and Its Applications at The Telecommunication Region
Topical Papers
Laser Reviews
-
Atsushi ONAE2003 Volume 31 Issue 7 Pages 430-432
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSDownload PDF (309K) -
Ken’ichi NAKAGAWA2003 Volume 31 Issue 7 Pages 433-437
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSWe have developed accurate optical frequency standards based on acetylene absorption lines in the 1.5 μm optical fiber communication band. We realized acetylene-stabilized diode lasers with a frequency reproducibility of 10 kHz (5×10-11). We have determined the absolute optical frequency of acetylene transitions with an uncertainty of 12 kHz (6×10-11). As a result, the acetylene transition (13C2H2 P(16)) was adopted as a recommended radiation for the realization of the meter. Thus the acetylene optical frequency standard can be used as a calibration frequency reference for the wavelength-division-multiplexed (WDM) optical communication systems in the 1.5 μm region.View full abstractDownload PDF (611K) -
Motonobu KOUROGI2003 Volume 31 Issue 7 Pages 438-442
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSOptical frequency comb generators based on Fabry-Perot electro-optic modulator and its applications were introduced. The applications have been spreading beyond the first purpose as an optical frequency standard. The examples are: a high stability optical pulse generation, a multi-wavelength light source, a radio-on-fiber, the light source for photonic local, etc. A commercially viable optical frequency comb generator is developed in the present research. The venture firm for that was also established.View full abstractDownload PDF (987K) -
Masataka NAKAZAWA2003 Volume 31 Issue 7 Pages 443-449
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSWe describe an application of ultrashort fiber lasers to high precision frequency standards that enable us to measure unknown optical frequencies directly. Mode-locked lasers have a unique feature in that there are neatly repetitive longitudinal modes in the output pulses, which form an optical comb. Therefore, if we can stabilize the comb separation, which is a longitudinal mode separation, we can use such a comb as an extremely precise “optical measure”. In this paper, we describe two kinds of frequency standard application of mode-locked fiber lasers. One is passive mode locking which has a fine and long comb. However, it is difficult to extract one of the optical combs. The other is active mode locking which has a coarse and short comb. Nevertheless, it is advantageous in that it makes it possible to extract one of the standard combs with an optical filter and transmit it through an optical network. Finally, a cesium (Cs) optical atomic clock is described as an application to a new frequency standard.View full abstractDownload PDF (1223K) -
Toshio MORIOKA2003 Volume 31 Issue 7 Pages 450-457
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSRecent progress in supercontinuum lightwave source for telecommunications is presented. It providess coherent 200 nm optical bandwidth at 1.5 μm, providing multi-wavelength short pulses for high-speed OTDM/WDM networks, more than 1, 000 high-quality optical carriers for DWDM, and an extremely precise optical frequency grid for optical frequency standards.View full abstractDownload PDF (1811K) -
Takashi NOGUCHI, Akitoshi UEDA, Yutaro SEKIMOTO, Masato ISHIGURO, Hiro ...2003 Volume 31 Issue 7 Pages 458-464
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSA waveguide-mounted photonic mixer employing a Uni-Traveling-Carrier Photodiode (UTC-PD), which is optically-pumped by two 1.55 μm lasers, has been built and tested as a millimeter-wave oscillator in the 75-115 GHz band. We have successfully demonstrated that the photonic mixer can produce an output power as high as ∼2 mW at 100 GHz with an input laser power of ∼100 mW. It is shown that the photonic mixer can provide a sufficient power required to pump an SIS mixer and that amplitude noise of the photonic mixer is as low as that of the Gunn diode in the 100 GHz band. This indicates that the photonic mixer is a promising candidate for a local oscillator source of a SIS mixer at millimeter and submillimeter wavelengths.View full abstractDownload PDF (1353K)
Regular Papers
Laser Review
-
Ken-ichi UEDA, Jianren LU, Kazunori TAKAICHI, Hideki YAGI, Takakimi YA ...2003 Volume 31 Issue 7 Pages 465-470
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSA novel technique for ceramic lasers has been developed recently. Self-energy-driven sintering of nano- and micro particles created the fully transparent Nd:YAG ceramics. The ceramic YAG demonstrated high efficiency operation (optical-to-optical conversion of 60 % in end pumping) and high power performance (1.46 kW in side pumping) using laser diode pumping. The mechanism of solid-phase crystals growth and the possible scaling were investigated principally. Typical performance of ceramic YAG laser has been reviewed. The present status and future prospect of the ceramic lasers technologies were discussed.View full abstractDownload PDF (1546K)
Laser Originals
-
Hiroyuki FURUKAWA, Masahiro NAKATSUKA, Chiyoe YAMANAKA2003 Volume 31 Issue 7 Pages 471-476
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSTo analyze 2 dimensional effects on long-distance propagation of laser pulses, we have developed a 2 dimensional analysis code LAPCEA (LAser Propagation with Coherent Excitation of Atoms). For the case with small transition dipole moment, the 2 dimensional effects on ionization rate of resonant atom appear clearly.View full abstractDownload PDF (779K) -
Toshihiko MORI, Kenji TOYODA, Masayoshi WATANABE, Shinji URABE2003 Volume 31 Issue 7 Pages 477-481
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSThe anharmonicity of the trap potential influences the motion of trapped and laser-cooled ions. The magnitudes of higher-order components of the trap potential depend on the electrode geometry. In this paper we provide a numerical study of the anharmonicity of linear Paul trap potentials with different electorode geometies. We have also experimentally observed nonlinear resonances of laser-cooled ions, and have studied the effect of anharmonicity in three types of liner Paul trap that have different distances between electrodes.View full abstractDownload PDF (965K) -
Osamu WAKABAYASHI, Hideomi OCHI, Hakaru MIZOGUCHI, Kiichiro UCHINO2003 Volume 31 Issue 7 Pages 482-488
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSA measuring method to evaluate the spectral profile of a KrF excimer laser used in lithography has been developed. In this method, the parameter of the spectral purity is defined by the spectral width of the laser (Δλ95%E), which contains 95 % of its total energy. During the measurements, the instrumental function of a high-resolution spectrometer was precisely estimated with a single-mode laser. The deconvolution technique was applied to evaluate the spectral width of the laser from the observed spectrum by using the instrumental function and the influence on the deconvolved profiles, due to noises included in the observed spectra, was examined quantitatively. In order to keep the required measurement accuracy within ± 5 % of the value Δλ95%E, the necessary product value of the maximum signal count-number and the signal averaging number was found to be more than 3.65×106 in the present system.View full abstractDownload PDF (696K)
- |<
- <
- 1
- >
- >|