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Volume 31, Issue 8
Displaying 1-10 of 10 articles from this issue
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Special Issue on High-power All-Solid-State Lasers and Their Applications
—Development Results of “Advanced Photon Processing and Measurement Technologies” Project—
—Development Results of “Advanced Photon Processing and Measurement Technologies” Project—
Special Issue
Laser Reviews
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—Development Results of “Advanced Photon Processing and Measurement Technologies” Project—Kenichi MATSUNO2003 Volume 31 Issue 8 Pages 506-507
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSDownload PDF (141K) -
Hiroshi YUASA, Yasuhiro AKIYAMA, Hiroyuki TAKADA, Naoto NISHIDA2003 Volume 31 Issue 8 Pages 508-512
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSBecause of their compactness and possibility of attaining high efficiency, laser-diode-pumped Nd:YAG lasers are expected to be applied to laser-based processes such as welding, cutting, drilling and marking. In the “Advanced Photon Processing and Measurement Technologies” project, we have developed and designed a high-power laser-diode-pumped Nd:YAG laser using simulation techniques such as a ray tracing, thermal analysis, and so on. We have successfully obtained a maximum output power of 12 kW with an efficiency of 23%, which to the best of our knowledge are the highest values for an Nd:YAG laser.View full abstractDownload PDF (1202K) -
Yuji NISHIKAWA2003 Volume 31 Issue 8 Pages 513-518
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSThis paper describes the development of diode-pumped high-power slab Nd:YAG lasers. Employing the laser diode pumping method, we realized a highly -efficient, high-power zigzag-slab laser with a small laser head volume. We found that it is still very important to realize the uniform pumped state and to greatly reduce the thermal lens even when using the slab media. After optimizing the pumping head, we obtained an average output power of 6.1 kW using a single YAG crystal with a laser head volume of 0.01 m3. Employing the polarization coupling method for two beams from two slab YAG lasers, we realized an average output power of 10.2 kW, an efficiency of 20.1 % and a laser head volume of 0.046 m3.View full abstractDownload PDF (1268K) -
Hirofumi KAN, Hirofumi MIYAJIMA, Shinichi FURUTA, Hideki SUZUKI, Takay ...2003 Volume 31 Issue 8 Pages 519-524
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSWe have been developing high-power, high-efficiency laser diodes (LD) for pumping the structural figure fiber laser. Coexisting of a high beam quality and high power is demanded of the excitation of the fiber laser. For this purpose, we developed the laser diodes structure, and high efficiency heat sink and special optics. We achieved to fabricate the LD modules with over 100 W output power, over 50 % efficiency, and beam quality of 15 mm·mrad (fast axis)×640 mm·mrad (slow axis). At HOYA corporation, using these modules CW 1 kW output of the fiber laser was achieved.View full abstractDownload PDF (1987K) -
Hiroshi SEKIGUCHI, Katsuhisa ITO, Akiyoshi TANAKA, Hitoshi YAMAURA, Hi ...2003 Volume 31 Issue 8 Pages 525-529
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSFiber lasers are promising for industrial applications because they excel in beam quality, efficiency, compactness, and ruggedness. However, even in the double-clad geometry, the power scalability is severely limited with the end-pumping technique. Indeed, the end faces of an optical fiber offer only a small area and this makes it difficult to launch the pump light from the many high power diode lasers. To solve this pump source multiplexing problem we researched and developed the fiber laser in original which was called “Fiber structure type fiber laser”. The disk-shaped, fiber-structure type fiber laser that we developed provides an average output of 1 kW (total output at both ends) and a laser efficiency (electric-to-optical) of 15.6 %. As the fiber laser except for the bundled type, the average output 1 kW is the highest value as long as we know.View full abstractDownload PDF (1018K) -
Junichi NISHIMAE2003 Volume 31 Issue 8 Pages 530-534
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSWe have developed an all-solid-state laser with high energy pulses and high brightness. In 2001 fiscal year, we produced the average output power of 1050 W with the beam-quality of about 8 times the diffraction limit at 23% of the electrical-to-optical efficiency by the equivalent coupling of two bi-focusing compensation resonators. We also proved the focusing ability of less than 50 μm of the beam diameter. By demonstrating these results, we successfully achieved the final targets of this project. Using the high-power and high-brightness laser we have succeeded to generate high power UV laser with high efficiency. We kept more than 20-W fourth-harmonic output powers over 50 hours by plural CLBO crystals. We also generated the fourth-harmonic output power up to 41.7 W. By the results shown above, we established high-power UV beam generation technology, and achieved the final target of this project.View full abstractDownload PDF (1160K) -
Kozo YASUDA2003 Volume 31 Issue 8 Pages 535-540
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSHigh performance laser welding process for thick materials was developed under the photon national project. In the heavy industries thick materials were required to weld with high quality without welding defects. Laser welding system by using silica fiber was high potential for heavy industries because of high flexibility. We developed the welding system to weld up to 30 mm of stainless steel and up to 20 mm of aluminum alloy with 1 m/min. The simulation technology of development of grasping of laser processing phenomena, in-situ monitoring method and the development of the composition technique of the laser beam were developed.View full abstractDownload PDF (1534K) -
Yuji KAWAKAMI, Eiichi OZAWA2003 Volume 31 Issue 8 Pages 541-547
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSThe purpose of this research is to develop new fabricating technology for a heat-resistant microcircuit substrate with high quality nanoparticles synthesized using Nd:YAG lasers. The nanoparticles of refractory metals such as tungsten (W) and molybdenum (Mo) could be synthesized using the laser ablation method to increase the source materials for nanoparticles. The geometric standard deviation (σg) value of the nanoparticle diameter should be controlled to less than a 1.2 with a 20 to 50 nm diameter and new nanocomposite materials are synthesized by mixing more than two kinds of nanoparticles. As for micropatterning using nanoparticles films, we produced fine lines with W nanoparticles, micro-coils with W, platinum (Pt), gold (Au), and capacitors using Au/BaTiO3/Au multi-layer thin films by the laser ablation/gas deposition method.View full abstractDownload PDF (1592K)
Laser Original
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Nobuyasu SUZUKI, Yuka YAMADA, Toshiharu MAKINO, Takehito YOSHIDA2003 Volume 31 Issue 8 Pages 548-551
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSWe have developed technologies for fabricating nanoparticles of high purity and homogeneous size, and for synthesizing them into new quantum functional structures, such as fine definition luminous devices. We have established a novel formation process for monodispersed semiconductor nanoparticles, by combining pulsed laser ablation for nanoparticle formation and a differential mobility analyzing system for size classification. Furthermore, we have successfully fabricated fine definition multi-color luminous devices with active materials of the monodispersed silicon nanoparticles.View full abstractDownload PDF (755K)
Regular Paper
Laser Original
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Norio TSUDA, Jun YAMADA2003 Volume 31 Issue 8 Pages 552-556
Published: 2003
Released on J-STAGE: February 03, 2006
JOURNAL FREE ACCESSA safety area sensor for automatic guided vehicles using a semiconductor laser and a CCD camera has been studied. But this detection system, which depends on the light intensity, has the weak point for disturbance light. A new detection method is proposed which is called beam width selection method. This method is able to select a laser light from the beam width difference between a laser light and a disturbance light. The edge component of the video signal is selected by a differentiation circuit, and the pulse signals are produced from the positive differentiation signal and negative one. The laser light signal can be obtained from the product of these pulse signals. The detected distance is 3 m and the detected width is 1 m under the disturbance light of 10000lx. The repetition error for various color obstacles is below 0.2 percent.View full abstractDownload PDF (673K)
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