著者

山中 龍彦

出版者

The Laser Society of Japan

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.24, no.5, pp.533-540, 1996-05-31 (Released:2010-02-26)

参考文献数

16

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Control of lightning is a dramatic challenge to nature. The lightning attacks to the electric power line make a lot of economical loss in the sophisticated modern society since electric power failure induces a lot of trouble in the computerized systems even if it is very short time. If the lightning could be controlled one will be free from such a trouble and save the cost expensed for electric power failure guard system. The scenarios and issues of laser triggered lightning are reviewed presenting some experimental results as well as the mechanisms and types of lightning, characteristics of the long gap electric discharge and some results of triggered lightning by rockets.

著者

竹内 延夫 杉本 伸夫 桜井 捷海 馬場 浩司 上野 敏行

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.11, no.10, pp.763-771, 1983

被引用文献数

1

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Pseudo-random-modulation CW lider (RM-CW lider) is a new lider technique, which is essentially an optical version of the pseudo-noise (PN) radar. However, the crossover function is introduced to the RMCW lider in order to suppress the near-, distance strong-echo contribution. In his paper, RM-CW lidar is theoretically treated both in Mie-scattering lidar and differential absorption lidar (DIAL) cases. The fundamental performance of the former is experimentally demonstrated and the ability ofthe latter is discussed in a detailed case using an Ar laser as a transmitting laser.

著者

竹内 延夫 桜井 捷海

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.17, no.4, pp.320-328, 1989

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A diode-laser random-modulation cw lidar (DL-RM-CW lidar) has an advantage of portability and versatility in handling. This paper reports examples of the npasurements of visibility and road dust dispersion by using the DL-RM-CW lidar.

著者

竹内 延夫 馬場 浩司 桜井 捷海 上野 敏行 井戸田 健 新井 敏弘 常見 真人 石河 直樹

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.13, no.4, pp.353-364, 1985

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Random-modulation cw (RM-CW) lidar has characteristics that make it possible to use a small-power cw laser as the light source. Development of laser diodes (LD) has been very rapid recently. The laser diode is compact in size and can be driven with little energy compared with traditional lasers, so that it is the most promising candidate for use in a portable, compact and practical lidar system. In this paper, a prototype portable RM-CW lidar system with an LD light source is reported. This is the first report of a practical LD system, to the authors' knowledge. Measurements of the spatial aerosol profile up to several hundred meters, as well as cloud ceiling-height up to several kilometers, were detected, at night time with this system and are shown in this paper.

著者

折井 靖光 宮本 勇 丸尾 大 樫浦 英秋 大越 昌幸 村原 正隆 御代川 孝彦 豊田 浩一 大迫 寛樹 佐藤 博保 篠原 久典 小林 誠 堀木 保宏 土井 章裕 小海 文夫 島本 幸次郎 古賀 義紀 福田 健三 新納 弘之 井村 達哉 大花 継頼 大内 秋比古 永井 千秋 矢部 明 井本 吉信 中山 斌義 久保 宇市 西井 正信 杉本 俊一 清水 雄一 鈴木 伸武 河西 俊一 長瀬 智洋 遠藤 正雄 江口 洋介 津 田裕 佐藤 宏一 山根 啓嗣 森下 正浩 松本 明 千賀 洋之 仲前 一男 大同 雅人 甲藤 正人 黒澤 宏 奥田 昌宏 佐々木 亘 野澤 繁典 五十嵐 龍志 星野 聡 常見 明良 杉岡 幸次 緑川 克美 田代 英夫 北村 一典 市川 義博 菅野 晃 窪田 貴晴 水原 貴之 小林 正樹 辻原 清人 英 貢 古野志 健男 井口 哲 松吉 達郎 大家 利彦 山口 滋 森 実紀夫 関根 和雄 剣持 庸一 辻本 博 土居 功年 藤林 肇次 吉田 典生 中溝 佳幸 松原 真人 竹中 裕司 西前 順一 葛本 昌樹 趙 同栄 空閑 良寿 大山 俊之 武内 一夫 永田 伍雄 川崎 暢之 飯村 康紘 石井 忠浩 Zhao T. R.

出版者

The Laser Society of Japan

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.21, pp.129-134,143, 1993

著者

武内 一夫 井上 一郎

出版者

The Laser Society of Japan

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.12, no.6, pp.306-312, 1984-06-30 (Released:2010-02-26)

参考文献数

20

被引用文献数

1 1

著者

阪井 清美 谷 正彦 松浦 周二

出版者

The Laser Society of Japan

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.26, no.7, pp.515-521, 1998-07-15 (Released:2010-08-25)

参考文献数

18

被引用文献数

2 1

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This paper describes the terahertz electromagnetic pulses emitted when femtosecond laser pulses irradiate quantum wells, bulk semiconductors, and photoconductive antennas fabricated on low-temperature-grown GaAs substrates. The continuous-wave (CW) terahertz electromagnetic radiation emitted when these photoconductive antennas are excited by two single-frequency CW semiconductor lasers is also described, as are the applications of the resultant terahertz wave in fields such as imaging and spectroscopy.

著者

小野 崇人 ミンゴ ファン 李 東原 江刺 正喜

出版者

The Laser Society of Japan

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.29, pp.S11-S12, 2001

著者

石井 勝巳

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.40, no.12, pp.963, 2012 (Released:2020-08-26)

参考文献数

3

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Recently, lasers are remarkably in use under various circumstances. The measurement of laser power and energy is the most fundamental one, and to know it quantitatively is very important for laser optimization by alignment, daily check as well as the min-max setting and the feedback system control in laser processing application, which leads to better quality control. So the interest in laser measurement is increasing more and more. In this paper I will pick up power meter and explain the principle, how to use and things to remember.

著者

平野 達

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.35, no.8, pp.486-492, 2007

被引用文献数

1

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PDT is based on the generation of singlet oxygen (<SUP>1</SUP>O<SUB>2</SUB>) in a photochemical reaction among a tumor-accumulated photosensitizer, irradiation light, and oxygen in a tumor, and the detection of <SUP>1</SUP>O<SUB>2</SUB> is very important for understanding the mechanism of PDT. We used a near-infrared detection system to detect a 1270nm emission that was derived from the <SUP>1</SUP>O<SUB>2</SUB>. Utilizing this system, we detected the generation of <SUP>1</SUP>O<SUB>2</SUB> from Photofrin dissolved in water or injected in a HeLa tumor-bearing mouse. We showed the irradiation power dependence of the generation of <SUP>1</SUP>O<SUB>2</SUB> in 5-ALA-mediated PDT with 9L cells and 9L tumor-bearing rats. High-power irradiation reduced the generation of <SUP>1</SUP>O<SUB>2</SUB> more than that with low power, and an MTT assay revealed that more 9L cells were killed by low-powered irradiation. In tumors, low-powered irradiation resulted in efficient tumor necrosis. Generations of <SUP>1</SUP>O<SUB>2</SUB> in ICG and TiO<SUB>2</SUB> irradiation are also described.

著者

苗代 弘 和田 孝次郎 魚住 洋一 小林 弘明 竹内 誠 長谷 公洋 川内 聡子 佐藤 俊一

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.40, no.4, pp.265, 2012 (Released:2020-07-16)

参考文献数

17

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Positive behavioral improvement has been observed following transcranial near-infrared light therapy in humans with chronic traumatic brain injury and acute stroke. We first examined the effect of 808 nm laser diode irradiation on regional cerebral blood flow (rCBF) in mice. An 808 nm CW diode laser was applied to the hemisphere transcranially. Transcranial near-infrared laser irradiation increased rCBF by 30% compared to control value in mice. Near-infrared laser irradiation also provoked a significant increase in cerebral nitric oxide concentration. In the clinical setting, transcranial near-infrared lightemitting diode irradiation to the forehead in a patient with persistent vegetative state following head injury was done. rCBF showed focal increase of 20%, compared to the pre-treatment value. The patient showed some improvement in his neurological condition after light-emitting diode therapy. Transcranial near-infrared irradiation might increase rCBF with some improvement of neurological condition in patients. Further study is warranted.

著者

ミラボー レイク

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.34, no.6, pp.423-428, 2006-06-15 (Released:2014-03-26)

参考文献数

24

被引用文献数

1 1

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On 2 October 2000, a 12.2-cm diameter, 50.6-gram laser-boosted rocket Lightcraft flew to a new altitude record of 71-meters (233-ft) at White Sands Missile Range (WSMR) in New Mexico. The PLVTS 10-kW pulsed carbon dioxide laser, located on the High Energy Laser Systems Test Facility (HELSTF) powered the record flight, as well as six others-two of which reached 48.4-m (159-ft) and 56-m (184-ft). These were the first outdoor vertical, spin-stabilized flights of laser Lightcraft. Besides nearly doubling the previous altitude record of 39 meters (128-ft) set on 9 July '99, the Model #200 Lightcraft simultaneously demonstrated the longest laser-powered free-flight, and the greatest ‘air time’ (i.e., launch-to-landing/recovery). With a modest investment of under a million dollars, a string of ever-increasing Lightcraft altitude records have been set over the past four years-since the first flight on 23 April 1997. This embryonic, propulsion concept embodies “disruptive technology” that promises to radically transform our ideas about global flight transportation and space launch systems, over the next 15 to 25 years.

著者

宅間 宏

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.17, no.2, pp.69-70, 1989-02-28 (Released:2010-03-17)

著者

小松 光昭 村田 雅人 木暮 信一

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.40, no.4, pp.285, 2012 (Released:2020-07-16)

参考文献数

17

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This study clarifies the effect of low-power laser irradiation (LLI) on the muscle contraction of frog gastrocnemius and provides further insights into the possibility of clinical applications at the mammal level. When we used continuous wave LLI on the muscle contraction of frog gastrocnemius, the retardation of tension attenuation was obtained by near-infrared LLI (808 nm, 100 mW). However, we could not determine whether such retardation was based on the thermal or the photochemical effect of LLI. Since a pulsed laser has the potential to discriminate such effects, we conducted the present experiments. As a result, the pulsed LLI induced neither temperature increments nor retarded muscle fatigue. Although a thermal effect on the retardation of muscle fatigue cannot be excluded, we conclude that the photochemical action is dominant if the optical absorption and the temperature change of living tissue are considered.

著者

田村 公一 吉田 英二 中沢 正隆

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.27, pp.145-146, 1999

著者

角屋 豊 山西 正道

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.23, no.11, pp.1008-1012, 1995

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We have demonstrated that the exciton-polariton mode splitting in semiconductor microcavities can be continuously altered in a wide range, from its maximum to zero, through the change in the exciton oscillator strength. This has been achieved by making use of a quantum confined Stark effect together with angle tuning of the cavity mode. On the basis of the ex-perimental results, we point out a possibility of THz electromagnetic wave radiation from the oscillating dipole associated with the cavity-polariton in biased semiconductor microcavities.

著者

高本 将男

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.39, no.11, pp.825-830, 2011-11-15 (Released:2015-09-03)

参考文献数

27

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In recent years, with such rapid progress in laser technology as optical frequency combs, stable laser

著者

中川 賢一

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.39, no.12, pp.904-909, 2011-12-15 (Released:2015-09-03)

参考文献数

15

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When atoms are excited to Rydberg states by lasers, the excitations of nearby atoms to Rydberg states

著者

岡 久雄

出版者

The Laser Society of Japan

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.29, no.1, pp.3, 2001-01-15 (Released:2010-03-17)

被引用文献数

1

著者

宗宮 健太郎

出版者

一般社団法人 レーザー学会

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.37, no.2, pp.108-112, 2009-02-15 (Released:2015-08-04)

参考文献数

14

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gravitational-wave detectors. The use of squeezing techniques is expected to contribute to the