2007 Fiscal Year Final Research Report Summary
Studies on Nonlinear Physics and Application Technology of Thin-Slice Solid-State Lasers with Coated End Mirrors
| Project/Area Number |
18560038
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Tokai University |
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Principal Investigator |
OTSUKA Kenju Tokai University, School of Information Science and Technology, Professor (60266369)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Thin-slice solid-state lasers / Laser-diode pumping / Lasing pattern formation / Local transverse modes / Micro-grained ceramic lasers / Ince-Gaussian modes / tical vortex / Self-mixing laser metrology |
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| Research Abstract |
The following main results have been obtained through studies on nonlinear physics and application technology using laserdiode (LD) pumped thin-slice solid-state lasers.
1. Pattern formations in LD-pumped thin-slice solid-state lasers
(1) Effects of surface roughness of reflective ends and pump-beam spot size on lasing pattern formations were studied systematically in wide-aperture thin-slim solid-state lasers with LD pumping. Such curious lasing patterns as quantum billiard-like modes, composite lattice modes and speckle modes were found experimentally.
(2) Segregations into local transverse modes' and associated high-speed intensity modulations inclnding chaos were found in conventional Nd. : YAG ceramic lasers whose average grain size is several tens of microns. These phenomena were well reproduced theoretically.
(3)The inherent problem in ceramic lasers was solved in the following way (i) The selective excitation of Ince-Gaussian lasing modes with learn diameters sufficiently larger th
… More
an grain sizes ; (ii) The use of micro-grained ceramic lasers with average grain size of few microns. In both cases, stable oscillations without segregations into local modes were realized.
(4)The Lapumping method for controlled generations of higher order Ince-Gaussian modes in microchip solid-state lasers was developed and formation of various types of novel optical vortices was realized toward manipulating motions of small paricles.
2.LD-pumecl self-mixing thin-slice solid-state laser metrology
(1) We increased the optical sensitivity by two-orders of magnitude by improving devices in the frequency-shift feedback scheme.
(2) We realized real-time vibrometry of 1-nm amplitude and quick sizing of small particles in water whose concentration is below 1 ppm in the particle diameter range of 80-500mn. The three-dimensional real-time vibrometry of 1-nm-amplitude was realized by usinghe carrierfrequency multiplexing method which we developed. The overall dynamics of Brownian particles was captured for the fa-A time by the FM demodulation circuit.
(3) We applied our self-mixing laser metrology to flow measurements and quick measurements of flow velocity and dynamic viscosity were successfully demonstrated. Also, the detection of small particles in the flow was done under the concentration limit of 0.01ppm for 262-nmpolystyrene latex spheres. Less
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[Journal Article] Experimental Observations of Dual-Polarization Oscillations in Laser-Diode-Pumped Wide-Aperture Thin-Slice Nd : GdVOA Lasers2007
Author(s)
J.-Y, Ko, C.-C., Lin, K., Otsuka, Y., Miyasaka, K., Kamikariya, K., Nemoto, M.-C., Ho, I.-M., Jiang
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Journal Title
Optics Express 15
Pages: 945-954
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Chaos Synchronization Among Orthogonally Polarized Emissions in a Dual-Polarization Laser2007
Author(s)
K, . Otsuka, K., Nemoto, K., Kamikariya, Y., Miyasaka, C.-C., Lin, J.-Y., Ko
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Journal Title
Physical Review E 76
Pages: 026204
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Nonlinear Dynamics in Thin-Slice Nd : YAG Ceramic Lasers : Coupled Local-Mode Laser Model2006
Author(s)
K., Otsuka, T., Narita, Y., Miyasaka, C.-C. Lin, J.-Y., Ko, S.-C., Chu
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Journal Title
Applied Physics Letters 89
Pages: 081117
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Composite Lattice Pattern Formation in a Wide-Aperture Thin-Slice Solid-State laser with Imperfect Reflective Ends2006
Author(s)
K., Otsuka, Y., Miyasaka, T., Narita, S.-C., Chu, C.-C., Lin, J.-Y., Ko
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Journal Title
Physical Review Letters 97
Pages: 213901
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Detection of Small Particles in Fluid Flow with a Self-Mixing Laser2007
Author(s)
K., Kamikariya, S., Sudo, Y., Miyasaka, K., Nemoto, K., Otsuka
Organizer
Conference on Laser and Electro-Optics(CLEO) Pacific Rim, Seoul
Year and Date
2007-08-31
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Accurate Sizing of an Extremely Small Quantity of Brownian Particles in Water with a Laser-Diode-Pumped Self-Mixing Thin-Slice Nd : GdVO_4 Laser2007
Author(s)
K., Nemoto, Y., Miyasaka, K., Kamikariya, S., Sudo, K., Otsuka
Organizer
CLEO Pacific Rim, Seoul
Year and Date
2007-08-31
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 「半導体レーザー励起自己混合薄片固体レーザーによる精密ナノ計測2007
Author(s)
須藤, 誠一, 宮坂, 善彦, 上仮屋, 考二, 根本, 佳奈, 山口, 滋, 大塚, 建樹
Organizer
レーザー学会学術講演会27回年次大会宮崎シーガイア・リゾート
Year and Date
2007-01-17
Description
「研究成果報告書概要(欧文)」より
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