著者

吉田 弘樹 山平 優

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.32, no.5, pp.343-347, 2004-05-15 (Released:2008-11-15)

参考文献数

17

被引用文献数

3 3 3

---

Target injector is an essential device to be established for a laser-fusion reactor. This paper describes current status of the injector research and introduces our research results of a coil gun. The drive circuits and trigger timing of the coil gun were optimized to improve injected projectile speed. The maximum speed at the first stage achieved to 8.7 m/s after optimization. The laser shot demonstration was carried out by the coil gun with an optically triggered Nd:YAG laser. The design guideline for a coil gun is discussed with experimental results and numerical simulation.

著者

小関 泰之 伊東 一良

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.887-892, 2011-12-15 (Released:2015-09-03)

参考文献数

38

---

We introduce stimulated Raman scattering (SRS) microscopy, which enables label-free biological

著者

村井 昭

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.14, no.4, pp.288-289, 1986

著者

星宮 務

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.32, no.10, pp.631-635, 2004-10-15 (Released:2009-09-19)

参考文献数

29

被引用文献数

1 1

---

In this article, the basic principle of photoacoustic microscope (PAM) and imaging was introduced paying the special attention to its detection schemes. The experimental apparatus and applications of PAM were reviewed. Depth profiling using PAM in the nondestructive inspection of semiconductor device was discussed. The principle of spectroscopic analysis method by integration over PAM image measured with respect chemical reagent concentraion or pollen number was also discussed. Furthermore, photoacoustic imaging technique including photoacoustic tomography applied to biological imaging was reviewed.

著者

谷内 哲夫 四方 潤一 伊藤 弘昌

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.30, no.7, pp.365-369, 2002-07-15 (Released:2009-10-21)

参考文献数

20

---

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.

著者

佐々木 彰 加藤 公敏 伊藤 卓郎

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.15, no.2, pp.98-105, 1987-02-28 (Released:2010-02-26)

参考文献数

13

---

An internal-mirror He-Ne (λ=633 nm) laser tube is mounted in a duralumin box which is thermally connected to other box attached thermo-elements, via heat pipes. The output power and the frequency of the laser are stabilized by two simple method. First, the total back beam intensity detected with a silicon photodiode is fed to a heater wound around the laser tube. The output stability of±0.15% and the frequency stability of ±1.3×10-8 are obtained over a period of 10 min or longer. Second, the laser tube temperature detected with a thermistor is fed to a heater. The output stability of ×0.3% and the frequency stability of ±4.5×10-8 are obtained over a period of 10 min or longer. This method does not use the laser beam intensity, thus the optical-feedback effect does not affect the laser stabilization.

著者

田中 拓男 河田 聡

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.32, no.1, pp.11-16, 2004 (Released:2006-03-17)

参考文献数

20

---

Three-dimensional multi-layered optical storage is one of the most promising methods that break the limitation of recording density in optical storage. It stores the bit information onto the multilayered recording planes inside the thick recording medium and realizes the tremendous large recording capacity. This paper describes the recording/reading principles, the systems, and the materials suitable for three-dimensional multi-layered memory. We also present the experimental results that using photochromic organic materials and rhodamine-B-doped and Au(III)-doped PMMA for recording medium.

著者

上野 登輝夫

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.2, pp.85-89, 2011-02-15 (Released:2015-09-03)

参考文献数

15

---

Since their invention, lasers have been put to use in a variety of ophthalmic treatment. In addition to

著者

樋口 卓也

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.45, no.4, pp.221, 2017 (Released:2020-12-17)

参考文献数

20

---

When the electric field of light becomes comparable to or larger than the internal fields experienced by electrons in matter, the electron dynamics are then governed by optical-field-driven processes. By combining ultrashort laser pulses and the optical field enhancement at the surface of metallic nanostructures, such high-field strengths can be reached with moderate laser powers and without damaging the structures. Moreover, photoelectrons emitted from the surface under such intense optical fields with ultrashort durations are temporally and spatially well confined. Additionally, these electrons have been shown to be sensitive to the optical field waveform, underscoring the possibilities to control electron on a sub-optical, attosecond timescale. This review provides an overview of these strong-field-driven attosecond electron dynamics at nanostructures, extending its future ramifications as a key ingredient for light-field electronics, whose operation bandwidth may reach the petarahertz frequency range.

著者

山中 千代衛

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.38, no.1, pp.29-34, 2010-01-15 (Released:2015-08-08)

参考文献数

6

---

Nuclear fusion, the origin of solar energy, has been sustained for billions of years in the universe. For 50

著者

原山 卓久 砂田 哲 都築 健

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.7, pp.515-519, 2011-07-15 (Released:2015-09-03)

参考文献数

17

---

Fast generation of non-deterministic random bit sequences is crucially important for secure

著者

武岡 正裕 佐々木 雅英

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.32, no.9, pp.600-603, 2004-09-15 (Released:2010-01-12)

参考文献数

14

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.19, no.6, pp.plate1, 1991-06-29 (Released:2010-02-26)

著者

山本 洋平

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.46, no.1, pp.25, 2018 (Released:2020-12-17)

参考文献数

19

---

We present self-assembled conjugated polymer microspheres that act as whispering gallery mode (WGM) resonators. For the preparation of conjugated polymer microspheres, vapor diffusion and miniemulsion methods are adopted. For the vapor diffusion method to obtain microspheres, amorphous aggregation of the polymers are crucial by introducing sterically bulky moieties that largely twists the polymer main chain. Focused laser irradiation to the perimeter of the microspheres excites WGM, where sharp and periodic lines appear in the PL spectrum. With a benefit of the high light confinement properties, we demonstrate long distance, directional, and efficient light energy transfer and wavelength conversion through bispheres. Furthermore, WGM lasing is achieved from conjugated polymer microspheres upon femtosecond pumping. Conjugated polymer microsphere resonators have advantages of high photoabsorptivity, high refractive index, and inherent conducting properties, as well as the simple fabrication process, which are valuable for applications to optical circuits, electrically-driven lightings, and chemical and biological sensors

著者

湯本 正樹 斎藤 徳人 和田 智之

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.48, no.8, pp.409, 2020 (Released:2022-10-25)

参考文献数

41

---

Cr 2+ doped II-VI chalcogenides (Cr:ZnSe, Cr:ZnS, Cr:CdSe, etc.) are attractive laser media for direct access to the mid-infrared (MIR) region, because they possess a broad fluorescence spectrum and a large stimulated-emission cross section. Using them as laser media allows us to obtain superb tunable laser and femtosecond laser capabilities in the mid-IR region. In this paper, we review the optical properties of Cr 2+ doped II-VI chalcogenides, pump sources, the recent progress of Cr 2+ doped II-VI chalcogenide lasers, and our mid-IR lasers based on Cr:ZnSe and Cr:CdSe.

著者

尾花 明

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.41, no.5, pp.369, 2013 (Released:2020-09-07)

参考文献数

10

被引用文献数

1

著者

高木 康博

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.44, no.7, pp.413, 2016 (Released:2020-12-17)

参考文献数

17

---

Holography is an ideal three-dimensional display technique. However, its electronic implementation requires light modulation by tremendous number of pixels whose pitch should be comparable to the wavelength of light. In this paper, several techniques proposed to overcome the above difficulty are shown; the technique using multiple spatial light modulators, the time-multiplexing technique, the technique using acousto-optic modulators, the resolution redistribution technique, and the horizontally scanning technique. Especially, the horizontally scanning technique is explained in detail; it is realized using the screen scanning system and the viewing-zone scanning system. The 360-degree holographic display is also realized based on the latter system.

著者

菱川 明栄

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.10, pp.745, 2012 (Released:2020-08-26)

参考文献数

33

---

Molecules exposed to few-cycle intense laser fields (> 1014 W/cm2) undergo a rapid bond breaking process called Coulomb explosion. Since the momenta of the resultant fragment ions reflect the geometrical structure of the target molecule, Coulomb explosion provides a direct access to the instantaneous structure of molecules during chemical reaction. Combined with the pump-probe scheme in ultrafast spectroscopy, Coulomb explosion imaging serves as a unique means to probe ultrafast molecular reaction processes in real time. Here we review this novel approach in ultrafast spectroscopy, with the applications to ultrafast isomerization of deuterated acetylene dication (C2D2 2+).

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.38, no.1, pp.13-15, 2010-01-15 (Released:2015-08-08)

参考文献数

10

---

The lasers appeared in the human culture as light sources based on the quantum mechanical properties of

著者

土方 俊樹 滝口 治久

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.12, no.2, pp.63-73, 1984