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Volume 17, Issue 11
Displaying 1-13 of 13 articles from this issue
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Takashi KUSHIDA1989 Volume 17 Issue 11 Pages 743
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDownload PDF (106K) -
Mitsuo MAEDA1989 Volume 17 Issue 11 Pages 744-748
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSThis preface to the special issue on 'Tunalbe lasers' briefly reviews the present status of tunable coherent sources covering a wide spectral region from vacuum ultraviolet to far infrared, and mentions a guideline for the selection of these sources. The tunable sources are classified into three groups: tunable lasers, nonlinear wavelength-conversion devices, and free electron lasers.View full abstractDownload PDF (527K) -
Koji MIZUNO, Kunioki MIMA, Shoichi ONO1989 Volume 17 Issue 11 Pages 749-758
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSA survey of electron beam devices as tunable coherent sources has been made. This survey consists of four parts. In the first section, physics of the interaction between free electron and free photon is studied. According to the condition to obtain energy- and momentum-conservations in the interaction, electron beam devices are classified into four groups. In the following three sections, fundamental operational principles and the present states of the arts of undulator type free electron devices, grating type devices (ledatron), and spiraling electron type devices will be presented.View full abstractDownload PDF (930K) -
Mitsuo MAEDA1989 Volume 17 Issue 11 Pages 759-771
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDye lasers are the most popular and useful tunable sources. They can be continuously tuned over a wide and important spectral region from near ultraviolet to infrared, and sophisticated tuning techniques have already been established. This paper reviews the features and the present situation of dye laser development, along with rate-equation analysis, laser dyes, and tuning and excitation techniques. Rescent progress in the generation of ultrashort light pulses is also discussed briefly.View full abstractDownload PDF (1467K) -
Toshio KUROBORI, Nozomu TAKEUCHI1989 Volume 17 Issue 11 Pages 772-781
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSColor centers-electrons trapped by the defects in insulating crystals-can be used for optically pumped lasers, which are broadly tunable over a wide range of ultraviolet, visible, and most importantly, infrared of 0.8-4 μm. Almost all the color center lasers are capable of cw and cw-mode-locked operation. In this paper, the recent progress in the stabilization of laser-active color centers, extension of the tuning range of color center lasers, typical performance of the lasers, and development of new femtosecond sources in the infrared are discussed.View full abstractDownload PDF (1006K) -
1.3-1.5 μm InGaAsP Tunable semiconductor lasersIkuo MITO1989 Volume 17 Issue 11 Pages 782-787
Published: November 28, 1989
Released on J-STAGE: August 04, 2010
JOURNAL FREE ACCESSWavelength tunable semiconductor lasers, operating at 1.3-1.5 μm wavelength region, are reviewed. The structures are classified to hybrid type tunable lasers and monolithic type tunable lasers. More than 1000 Å wavelength tuning was attained in a hybrid type tunable laser with an external grating mirror, and 100 Å tunable range for monolithic type 3-section tunable distributed feedback laser diode.View full abstractDownload PDF (621K) -
Koji SHINOHARA1989 Volume 17 Issue 11 Pages 788-791
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSSemiconductuctor lasers having radiation wavelength of over 2 μm are introduced. There are two types of lasers, which are III-V compounds and IV-VI compounds. Because of the miscibility gap, III-V compound lasers, such as InGaAsSb only emit at around 2 μm. On the other hand, IV-V1 compound lasers based on PbTe or PbSe extend their wavelength region. Nowadays the lasers of rare earth material doped with lead-chalcogenide emit at longer than 3.4 μm and are operable at high temperatures, permitting pulsed operation over 0 °C.View full abstractDownload PDF (425K) -
Kenzo MIYAZAKI1989 Volume 17 Issue 11 Pages 792-803
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSA review of the present status of continuously-tunable coherent vacuum ultraviolet (VUV) radiation sources is presented, focusing on the third-harmonic generation, resonant four-wave sum and difference frequency mixing, and anti-Stockes Raman scattering in gaseous nonlinear media. By using these third-order nonlinear processes in gases, the tunable VUV range of coherent radiation has been successfully extended from 200 nm down to about 70 nm.View full abstractDownload PDF (1287K) -
Takatomo SASAKI1989 Volume 17 Issue 11 Pages 804-814
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSFrequency conversion techniques using nonlinear optical materials are simple and useful to obtain lasers ranging from visible to ultra-violet region. Recently new nonlinear optical crystals have been or being developed for this purpose. Since KDP and LAP can be grown to big size, they are suitable for big laser systems of laser fusion experiments. New crystals KTP, BBO and LBP are promising for high power, high repetition lasers and optical parametric oscillators. For small power lasers such as diode lasers, potassium niobate, lithium niobate and KTP are used. Many new organic materials are being developed in place of these inorganic materials. Laser properties of these inorganic and organic crystals are described.View full abstractDownload PDF (1587K) -
Takahiro KUGA, Masahiro MATSUOKA1989 Volume 17 Issue 11 Pages 815-825
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSWe have developed a high repetition rate tunable uv picosecond light source by a sum frequency generation technique, a light source which eanbles us to observe transient phenomena without high density excitation effects. We have applied this light to the spectroscopy of CuCl and obtained several new resutls: pulsed propagation of polariton luminescence, precise pulse width measurement of the weak uv light, shorter lifetime of biexcitons than that previously reported and ultrafast optical switching by a polarization rotation effect.View full abstractDownload PDF (1176K) -
Selective Photochemical Reaction by Tunable LasersHideo TASHIRO1989 Volume 17 Issue 11 Pages 826-836
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSGeneral aspects and recent progress of laser isotope separation are introduced. From the veiwpoint of tunable laser application, emphasis is placed on the spectroscopic characteristics of isotope-selective photochemical reactions for both atomic (AVLIS) and molecular (MLIS) processes with examples of U, Pd, CHF3, and UF6. Potentials of newly developed lasers such as Ti: Al2O3 and FEL are also discussed.View full abstractDownload PDF (1136K) -
Shigemasa SUGA1989 Volume 17 Issue 11 Pages 837-844
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSSynchrotron radiation (SR) from the bending magnet of a circular electron (positron) accelerator is a brilliant source in the vacuum ultraviolet, soft-and hard-x ray regions. First the charcteristics of the bending SR are delete discussed. Though the brilliance of SR was improved dramatically in the last decade, neither bending, wiggler SR nor undulator SR is coherent. Coherent far infrared radiation in the mm wavelength region has recently been observed from a short electron bunch (- 2.5mm long) in a bending magnet connected to a linac at Tohoku University. Coherent radiation due to higher harmonics generation by laser excitation of electron bunches in an undulator is then described.View full abstractDownload PDF (853K) -
1989 Volume 17 Issue 11 Pages plate1-plate2
Published: November 28, 1989
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDownload PDF (4501K)
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