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Volume 30, Issue 6
Displaying 1-7 of 7 articles from this issue
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Special Issue on Advanced Optical Materials for Lasers
Special Issue
Laser Reviews
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Kou KUROSAWA2002 Volume 30 Issue 6 Pages 280
Published: June 15, 2002
Released on J-STAGE: October 21, 2009
JOURNAL FREE ACCESSDownload PDF (131K) -
Ken-ichi UEDA2002 Volume 30 Issue 6 Pages 281-286
Published: June 15, 2002
Released on J-STAGE: October 21, 2009
JOURNAL FREE ACCESSThe various aspects of optical fibers are investigated in relation to the advanced laser technology. The optical fiber is one of the lowest material in the optical materials. Low loss nature is attractive for the laser material because the laser performance is determined by the gain-to-loss ratio. The optical fiber has a unique nature of which optical parameter like refractive index and waveguide performance is strongly controlled by the anti-guiding or dispersion controlled structure. Fiber disk lasers are developed for the kW output and demonstrated 1020 W in cw mode. This is a typical result of a free-shape laser. The wide variety of expansion of this concept is discussed.View full abstractDownload PDF (599K) -
Shingo ONO, Toshimasa KOZEKI, Zhenlin LIU, Nobuhiko SARUKURA, Amina BE ...2002 Volume 30 Issue 6 Pages 287-289
Published: June 15, 2002
Released on J-STAGE: October 21, 2009
JOURNAL FREE ACCESSWe have developed degradation-free tunable ultraviolet laser. A growth of 7-cm diameter Ce3+:LiCaAlF6 (Ce:LiCAF) boule succeeded in CF4 atmosphere by the Czochralski method. Chirped-pulse amplification (CPA) in the ultraviolet region is demonstrated by use of a large-sized, broadband Ce:LiCAF laser medium. A coaxially pumped, large-aperture ultraviolet power-amplifier is also demonstrated for a terawatt-class ultraviolet CPA laser system. Future scaling of this Ce:LiCAF laser system will make available a new category of high-peak-power lasers in the ultraviolet region.View full abstractDownload PDF (506K) -
Akio IKESUE2002 Volume 30 Issue 6 Pages 290-296
Published: June 15, 2002
Released on J-STAGE: October 21, 2009
JOURNAL FREE ACCESSRecently, various transparent ceramics with excellent optical properties have been synthesized by a new processing method. For example in 1993, we successfully fabricated polycrystalline Nd:YAG ceramics with the same optical properties as high-quality Nd:YAG single crystal by the Czochralski method. The ceramics produced had extremely low porosity (ca. < 1 vol. ppm) and homogeneous structure. Furthermore, high-quality YIG single crystals with low dislocation densities could also be fabricated by a modified sintering method. The optical quality of some ceramic materials is improved dramatically to level the same as that of high quality single crystals. In this paper, I will discuss these new fabrication techniques and the application of optical ceramics as luminous tubes, new laser materials, scintillators, and optical communication components.View full abstractDownload PDF (1351K) -
- Transmittance and Refractive Index in VUV Region -Kenji MORINAGA, Shigeru FUJINO2002 Volume 30 Issue 6 Pages 297-302
Published: June 15, 2002
Released on J-STAGE: October 21, 2009
JOURNAL FREE ACCESSOptical transmission and refractive indexes in vacuum ultraviolet (VUV) region are very important and provide basic data for lens systems in micro lithography equipments and substrate materials using F2 excimer laser as a lightsource. High purity multi-component fluoroberyllate glasses are promising candidates for the deep UV transmitting optical materials due to their exceptionally large optical band gaps compared to those of the other fluoride glass systems. The optimum glass composition for VUV glass material were introduced in terms of glass forming ability and VUV absorption of impurities in the glasses. We also measured refractive indexes of the glasses in VUV region. In order to predict the refractive index, we presented compositional parameter for fluoride glass based on our measured data.View full abstractDownload PDF (626K) -
Shizuo TOKITO2002 Volume 30 Issue 6 Pages 303-307
Published: June 15, 2002
Released on J-STAGE: October 21, 2009
JOURNAL FREE ACCESSThis article reviews light-emitting devices such as light-emitting diodes and laser diodes based on organic materials. Ways of controlling spontaneous emission in organic light-emitting diodes (OLEDs) have been studied using interference effects or the microcavity effect, and spectral narrowing and intensity enhancement have been observed. Optical excitation of organic thin films, which are commonly used for OLEDs, has been studied to clarify the laser action, and low lasing thresholds have been achieved. More recently, an organic single crystal with field-effect electrodes for current injection has exhibited spontaneous amplified emission (ASE) and laser action at higher current injection values. The high-quality single crystal and unique device configuration produced an electrically pumped laser.View full abstractDownload PDF (531K) -
Hideki HIRAYAMA, Yoshinobu AOYAGI2002 Volume 30 Issue 6 Pages 308-314
Published: June 15, 2002
Released on J-STAGE: October 21, 2009
JOURNAL FREE ACCESSWe report on the growth and optical properties of (In)AlGaN compound semiconductors for the application of 300-350 nm-band bright ultraviolet (UV) light-emitting diodes (LEDs) or laser diodes (LDs). We demonstrated 230-280-nm UV intense emission from Al(Ga)N/AlGaN multi-quantum wells (MQWs) at 77K. Then we revealed that the 300-nm-band UV emission is considerably enhanced by the In-segregation effect upon introducing approximately 1-5% of In into AlGaN. We fabricated Inx1Aly1Ga1-x1-y1N/Inx2Aly2Ga1-x2-y2N MQWs with various compositions, and obtained room temperature (R.T.) intense emission in the wavelength of 280-400-nm. The UV emission of the InAlGaN-based MQWs was as strong as that of blue emission from InGaN-based QWs. We also fabricated UV-LEDs using a quaternary InAlGaN active region and achieved high-intensity 345 nm emission under R.T. CW operation.View full abstractDownload PDF (679K)
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