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Volume 22, Issue 8
Displaying 1-10 of 10 articles from this issue
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Yoshio CHO1994 Volume 22 Issue 8 Pages 609
Published: August 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (130K) -
Highly Efficient Phase Modulation and Nonlinear Frequency ConversionMotoichi OHTSU1994 Volume 22 Issue 8 Pages 610-616
Published: August 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSPerformances of anoptical frequency comb generator and nonlinear optical frequency conversionof semiconductor lasers were reviewed. They are studied for realizing frequency referencegrids for an accurate and wideband optical frequency sweep. Semiconductor lasers wereused as light sources by improving their frequency stability to 2.1×10-12 and by reducing theirfield spectral linewidth to 7 Hz. A precise and continuous frequency sweep for 64GHz wasrealized by heterodyne-type optical phase locking. Frequency refrence grids with aspan of 0.1THz was realized by the optical frequency comb generator. Second harmonics, sum-frequencyand difference frequency signals were generated by using nonlinear optical crystals for the 180-577 THzrange, i. e., the wavelength range of 0.52-1.67μm.View full abstractDownload PDF (940K) -
Chikara KONAGAI, Toshio SATOH1994 Volume 22 Issue 8 Pages 617-626
Published: August 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSCopper vapor laser pumped dye laser systems are being developed for Atomic Vapor LaserIsotope Separation (AVLIS). Function of dye oscillator is tuning its wavelength to absorptionline of Uranium. Precise tunability, high accuracy and also high efficiency are required for theoscillator, in order to separate trace Uranium 235 isotope from Uranium 238. To fulfill suchconditions, single axial mode dye oscillator with frequency-chirp is developed. This paper reviewsthe present status of wavelength control system in pulsed dye laser for AVLIS process.View full abstractDownload PDF (1278K) -
Yoh OGAWA, Shin ARAHIRA1994 Volume 22 Issue 8 Pages 627-634
Published: August 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSPassively mode-locked distributed-Bragg-reflector (DBR) lasers with an intracavity saturableabsorber were monolithically fabricated. A transform-limited pulse train with a durationof 3.5 ps has was successfully generated at a high repetition rate over 40 GHz. While maintainingthe transform-limited conditions, a wide lasing-wavelength tuning of 4 nm was achieved byinjecting a tuning current into the DBR section. When an active region current was increasedup to a few times the threshold, harmonic passive mode-locking was also observed. Terahertzratepulse generation has been successfully achieved, to our knowledge for the first time, froma one-chip optoelectric device. The DBR section was found to play significant role in generatingstable pulses without substructure, by providing frequency filtering that selects longitudinalmodes.View full abstractDownload PDF (897K) -
Noriaki MIYANAGA1994 Volume 22 Issue 8 Pages 635-654
Published: August 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSeveral techniques have been developed for the beam smoothing of high power glass laserfor the inertial confinement fusion research. A principal concept of beam smoothing includesthe random phasing of beam and the speckle suppression. Techniques of coherence control arequite important in order to smooth out the speckle. Techniques reviewed here are the polarizationdistribution across the beam, the introduction of incoherence, the angular dispersion of spectral component, and the frequency modulated light with temporal and spatial color cycles.View full abstractDownload PDF (2650K) -
Akihiro Morimoto, Tetsuro Kobayashi1994 Volume 22 Issue 8 Pages 655-663
Published: August 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSGeneration and application of chirp optical pulses is described. Chirp optical pulses are thelight of which instantaneous frequency are widely swept in several terahertz range within thedurations of picosecond to subpicosecond pulses. Chirp pulses are generated by using groupdelay dispersion with femtosecond pulses, nonlinear spectral broadning in an optical fiber, electrooptic modulation, and so on. With the use of the chirp optical pulses, it is possible notonly to generate ultrashort pulses but also to shape the otical pulses in femtosecond resolution. Electrooptic methods are emphasized to generate and to control the chirp pulses in this paper.View full abstractDownload PDF (1146K) -
Shuntaro WATANABE1994 Volume 22 Issue 8 Pages 664-671
Published: August 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe present status of high peak power lasers is overviewed. The princeple of chirped pulseamplification is briefly introduced. The high power lasers including glass, Ti: sapphire and Cr: LiSAF lasers are summarized. The frequency conversion of ultrashort pulses is described. Finally the possible application of chirped pulse amplification to the non-storage lasers like excimerand dye lasers is proposed to extract a full available energy.View full abstractDownload PDF (778K) -
Kenji WADA, Yoshio CHO1994 Volume 22 Issue 8 Pages 672-680
Published: August 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSChirp occurring within optical pulses from gain-switched semiconductor lasers causes significantproblems in their applications. However, a common expression giving the chirp estimationmay not be fully applicable in actual experiments. Simple and precise methods for carryingout the chirp estimation are required in such a field.
In this paper, problems and their solutions about chirp estimations from gain-switchingoptical pulses are reviewed laying stress on our results obtained from related studies.View full abstractDownload PDF (1040K) -
Yasuharu MINE, Hideaki SAITO1994 Volume 22 Issue 8 Pages 681-688
Published: August 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSWe review the progress of the adaptive optics to correct the distorted wavefront by using deformablemirrors. In this article, we place our particular emphasize on its applications foratmospheric compensation and laser beam control.View full abstractDownload PDF (1280K) -
Hidetsugu YOSHIDA, Kunio YOSHIDA1994 Volume 22 Issue 8 Pages 689-704
Published: August 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSPhase conjugation via stimulated Brillouin scattering (SBS) is useful to compensate thewavefront distortion due to the thermally induced aberrations and depolarization of solid statelaser medium. Principle of phase conjugation by SBS, reflectivities and fidelities of SBS forliquid and gaseous medium are discussed and several applications to compensate aberations inlaser oscillator and MOPA system are described.View full abstractDownload PDF (1643K)
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