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31 巻, 2 号
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「有機材料・化学プロセスにおけるレーザー応用」特集号
特集号
レーザー解説
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矢部 明原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 96-97
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーPDF形式でダウンロード (124K) -
－生体高分子とゲルの加工から－角田 勝則, 矢島 博文, 石井 忠浩原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 98-102
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーThe ArF excimer laser ablates the cornea and other tissue with micrometer-size precision and minimal residual thermal damage. However, there is still no clear picture regarding the mechanisms for the excimer laser ablation (ELA) giving rise to this favorable and characteristic removal of hydrated tissue. In order to gain obvious insight into the role of water in the ELA mechanism of the cornea, we have macroscopically investigated the ablation behavior of gels in the swelled states. The ELA of the hydrated collagen and polyacrylamide gel using ArF laser were scrutinized using time-resolved photography, atomic force microscopy (AFM), and FT-IR attenuated total reflectance spectroscopy (FTIR-ATR). The observed results led us to the conclusion that the control of the water content in and/or on the gel matrix during ELA would reduce any thermal and mechanical damage to the soft tissue.抄録全体を表示PDF形式でダウンロード (1002K) -
森田 浩原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 103-108
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーA new photochemical method to synthesize ultrafine particles from gaseous molecules is presented. The method was applied to gaseous mixtures of acrolein and some organosilicon compounds. From the chemical analysis of deposited ultrafine particles, it was found that two-photon excitation of organosilicon compounds produced novel chemical species. Surface characters of polyacrolein particles were successfully modified with gaseous cyclotetrasiloxane and with gaseous organic azide. Applicability of these particles to nanotechnology is briefly discussed.抄録全体を表示PDF形式でダウンロード (817K) -
渡邉 博佐原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 109-115
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーThe application of excimer laser to polyethylene-terephthalate fiber (PET) and aramid fiber is investigated, from a viewpoint of “ablation”. First, the ablation mechanism of these fibers were revealed, and then the adhesion performance of these fibers with rubber matrix were developed. The obtained knowledge will serve for the development of novel surface modification techniques for fibers of which the surface are relatively inert.抄録全体を表示PDF形式でダウンロード (1721K) -
深澤 憲正原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 116-121
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーLaser etching is a promising technique for the creation of high-resolution patterns on polymer surfaces by a non-contact mode. In the case of near-IR (NIR) laser patterning, however, it has been believed that laser etching mostly results in substantially disordered profiles due to thermal effects. In this article, we tried to show how clear-cut etching patterns can be obtained upon NIR laser irradiation. One example of creating clear-cut etched surface was achieved upon polystyrene films. In the system, it is considered that a mechanical fracture is a main mechanism of laser etching, not a fragmentation (thermal degradation) process. On the other hand, some polyimide films also gave clear-cut images, even if the films were fragmented. It is concluded that the thermo-mechanical properties of polymer materials play an important role for determining the quality of NIR laser etched surfaces.抄録全体を表示PDF形式でダウンロード (1309K) -
丸尾 昭二原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 122-128
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーIn recent years, microstereolithography techniques have been used to fabricate various types of three-dimensional micro/nano devices such as microelectromechanical systems, micro total analysis systems and photonic crystals. Two-photon microstereolithography is one of the most promising methods in microstereolithography. This paper describes the fabrication principle, a fabrication system and the latest experimental results of two-photon microstereolithography. In addition, several applications of two-photon microstereolithography, including optically driven micromachines and photonic crystals, are introduced. Two-photon microstereolithography is useful for not only micro/nano technologies but also biotechnologies.抄録全体を表示PDF形式でダウンロード (1703K) -
市川 結, 小山 俊樹, 谷口 彬雄原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 129-134
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーBased on our research, we comment on recent progress in organic semiconductor lasers. Styryl benzene derivatives having good gain-narrowing performance are one of promising materials for organic semiconductor lasers. Distributed feedback lasers made of styryl benzene derivatives exhibit low-threshold lasing by optical excitation. Organic semiconductor lasers activated through electric excitation may be achieved in the near future.抄録全体を表示PDF形式でダウンロード (938K)
レーザーオリジナル
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坪井 泰之原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 135-140
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーTo form thin films of organic functional polymers, we proposed a modified technique of pulsed laser deposition (PLD), photosensitized PLD. The feature of the technique is that ablation is brought about by excitation not of target materials themselves but of a small amount of photosensitizer doped in the polymer targets. Because of the efficient photosensitized thermal reaction, we can induce ablation at longer laser wavelength and lower fluence. Thus photochemical decomposition is avoided in the PLD process. By employing the technique, we succeeded in the deposition of thin films of various polymers. In this report, we focused our attention onto PTFE that has high potential of application in industrial electronics. Choosing graphite as a photosensitizer, we succeeded in the deposition of PTFE with a near-infrared (1064 nm) Nd3+: YAG laser of giant-pulse-type (80 μs), which is a versatile, economical, and widely spread light source in industry.抄録全体を表示PDF形式でダウンロード (1118K) -
西尾 悟原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 141-145
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーExcimer laser ablation (ELA) of 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA) targets enables us to obtain organic thin films with various electronic/electric properties with minute control by changing the ablation conditions. In particular, polyperinaphthelenic organic semiconductor (PPNOS) thin films are prepared by ELA of PTCDA with XeCl excimer laser beams. Enhancement of elimination reaction of side groups of PTCDA is observed by ELA of mixted targets of PTCDA with Co powder. Heterojunctions between the PPNOS films and n-Si wafers are formed and show obvious rectifier properties. I-V curves of the junction in the dark and under illumination show the possibility for the junction to be used as a photovoltaic cell. Furthermore, doping of PPNOS films with Li ions is carried out. The 950 mAh/g maximum capacitance at the first cycle, which is much higher than that of conventional graphite anodes indicates that the films are useful for anode electrodes for ultra thin rechargeable Li ion batteries.抄録全体を表示PDF形式でダウンロード (922K)
一般論文
レーザーオリジナル
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坂元 宏規, 岩瀬 孝邦, 柴田 公博原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 146-150
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーThe energy coupling rate during welding of Al-Mg-Si alloys with a CO2 laser and a Nd:YAG laser was measured calorimetrically. The coupling rate obtained with the Nd:YAG laser was higher than that with the CO2 laser for both heat conduction welding and keyhole welding. The coupling rate for CO2 laser welding changed steeply at the transition from a heat conduction welding state to a keyhole welding state. Coupling rates under the keyhole welding state match the Gouffe-Dausinger model that determines the coupling rate based on the weld depth and focal spot size. This model includes a constant figure that is dependent on laser beam absorptivity to molten metals and plasma in the keyhole. It is thought that the coupling rate in the heat conduction state depends on the absorptivity of the laser beam to molten metals. Absorptivity to plasma in the keyhole also affects the coupling rate in the keyhole welding state.抄録全体を表示PDF形式でダウンロード (793K) -
Hiroaki ASHIZAWA, Shigeru YAMAGUCHI, Masamori ENDO, Shinobu OHARA, Mas ...原稿種別: Others
専門分野: Others
2003 年 31 巻 2 号 p. 151-155
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーWe demonstrated a mid-IR optical NO2 monitor based on a frequency-stabilized, Yb-fiber laser pumped difference frequency generation (DFG) in a periodically poled lithium niobate (PPLN) crystal. A high power Yb-fiber laser with a fiber Bragg grating (FBG) and a distributed feedback (DFB) laser diode were used as DFG pump and signal sources, respectively. The spectral characteristics of NO2 were evaluated using a multipass absorption cell with an optical path length of 10 m. Continuous absorption spectra of NO2 from 2886.5 cm-1 (3.464 μm) to 2896.5 cm-1 (3.452 μm) were demonstrated over 10 cm-1 with a spectral resolution of approximately 60 MHz. We also demonstrate reproducibility and stability of NO2 detection system with the mid-IR light sources were investigated, in addition to long-term monitoring of NO2 concentrations over a three-day period.抄録全体を表示PDF形式でダウンロード (612K) -
仁木 秀明, 時田 茂樹, 井澤 靖和原稿種別: その他
専門分野: その他
2003 年 31 巻 2 号 p. 156-160
発行日: 2003年
公開日: 2006/02/03
ジャーナル フリーThis paper discusses spectroscopic data of Gd for laser isotope separation (isotope shifts, hyperfine structures and lifetimes) for 560-600 nm wavelength transitions. The possibility of selective excitation of 157Gd, using 533 cm-1→17974 cm-1, was discussed. Based on the polarization selection rules, selective photoionization of 155Gd and 157Gd was demonstrated. External magnetic field effect on isotopic selectivity was investigated experimentally and numerically. They verified that a magnetic field of 2 Gauss, for lsers with 50 ns durations, would completely destroy the selectivity.抄録全体を表示PDF形式でダウンロード (434K)
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