Yushi Kaneda

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• Chen, Q. u., Yoshimura, M., Tsunoda, J., Kaneda, Y., Imade, M., Sasaki, T., & Mori, Y. (2014). Sub-180 nm generation with borate crystal. Optical Materials.
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  Abstract: We demonstrated a new scheme for the generation of 179 nm vacuum-ultraviolet (VUV) light with an all-solid-state laser system. It was achieved by mixing the deep-ultraviolet (DUV) of 198.8 nm and the infrared (IR) of 1799.9 nm. While CsB3O5 (CBO) did not satisfy the phase-matching at around 180 nm, 179 nm output was generated with LiB3O5 (LBO) for the first time. The phase-matching property of LBO at around 180 nm was also investigated. There was small deviation from theoretical curve in the measurement, which is still considered reasonable. © 2014 Elsevier B.V. All rights reserved.
• Chen, Q. u., Yoshimura, M., Tsunoda, J., Kaneda, Y., Imade, M., Sasaki, T., & Mori, Y. (2013). 179 nm Generation with borate crystal. Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest.
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  Abstract: We demonstrated the generation of 179 nm vacuum-ultraviolet (VUV) lights with a solid-state laser system. It was realized in LiB3O5 crystal by mixing the deepultraviolet of 198.8 nm and the infrared of 1799.9 nm. © 2013 IEEE.
• Chen, C., Sasaki, T., Rukang, L. i., Yincheng, W. u., Lin, Z., Mori, Y., Zhanggui, H. u., Wang, J., Uda, S., Yoshimura, M., & Kaneda, Y. (2012). Nonlinear Optical Borate Crystals, Principles and Applications. Nonlinear Optical Borate Crystals, Principles and Applications.
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  Abstract: This clear and self-contained review of the last four decades of research highlights in the hot field of nonlinear optical (NLO) crystals, particularly of borate-based ultraviolet and deep-ultraviolet NLO crystals, covers three major subjects: the structure-property relationship in borate crystals, the structural and optical characteristics of various promising borate crystals, and their fruitful applications in a wide range of scientific and technological fields. Edited by the discoverers and users of these optical borate crystals, this is a readily accessible reading for semiconductor, applied and solid state physicists, materials scientists, solid state chemists, manufacturers of optoelectronic devices, and those working in the optical industry. © 2012 Wiley-VCH Verlag GmbH & Co. KGaA.
• Chen, Q. u., Yoshimura, M., Tsunoda, J., Zhang, K., Kaneda, Y., Imade, M., Sasaki, T., & Mori, Y. (2012). Phase-matching properties at around 190nm of various borate crystals. Applied Physics Express, 5(6).
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  Abstract: We report on the phase-matching properties of borate crystals of LiB 3O 5 (LBO), CsB 3O 5 (CBO), and CsLiB 6O 10 (CLBO) in vacuum-ultraviolet (VUV) light generation at around 190 nm. A new phase-matching property in the VUV spectral range for CBO grown from a self-flux solution was found to have better agreement with new Sellmeier's equations developed in our laboratory. A 189nm output of 11.4mW was produced in a CLBO with a conversion efficiency of 7.3% from 213nm input. CLBO is suitable for VUV light generation around 190nm with the present laser system. © 2012 The Japan Society of Applied Physics.
• Qu, C., Yoshimura, M., Tsunoda, J., Kaneda, Y., Imade, M., Sasaki, T., & Mori, Y. (2012). 189-nm wavelength generation with borate crystals. 2012 Conference on Lasers and Electro-Optics, CLEO 2012.
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  Abstract: The phase-matching properties of borate crystals were investigated for vacuum ultraviolet light generation. A 189-nm output of 8.2 mW was observed with CLBO while new phase-matching property of CBO was found. © 2012 OSA.
• Qu, C., Yoshimura, M., Tsunoda, J., Kaneda, Y., Imade, M., Sasaki, T., & Mori, Y. (2012). 189-nm wavelength generation with borate crystals. CLEO: Science and Innovations, CLEO_SI 2012, CF3A.4.
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  Abstract: The phase-matching properties of borate crystals were investigated for vacuum ultraviolet light generation. A 189-nm output of 8.2 mW was observed with CLBO while new phase-matching property of CBO was found. © OSA 2012.
• Kawamura, T., Shimizu, Y., Yoshimura, M., Fukushima, Y., Nishioka, M., Kaneda, Y., Kitaoka, Y., Mori, Y., & Sasaki, T. (2010). Characterization of CsLiB₆O₁₀ crystal grown in a dry atmosphere. Japanese Journal of Applied Physics, 49(6 PART 1), 0655021-0655024.
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  Abstract: We grew CsLiB6O10 (CLBO) crystals in a dry atmosphere to obtain high-quality crystals that include less water as an impurity. We estimated the level of water impurity in the crystals using a nonpolarized Fourier transform infrared spectrometer and also measured bulk laser damage resistance using a 266nm high-repetition-rate ultraviolet pulse laser. We found that the CLBO crystals grown in a dry atmosphere had an approximately 80% less water impurity and 1.2- to 1.5-fold greater resistance to laser damage than the CLBO crystals grown in an ambient atmosphere. © 2010 The Japan Society of Applied Physics.
• Kawamura, T., Yoshimura, M., Shimizu, Y., Nishioka, M., Fukushima, Y., Kaneda, Y., Kitaoka, Y., Mori, Y., & Sasaki, T. (2010). Crystal growth of CsLiB₆ O₁₀ in a dry atmosphere and from a stoichiometric melt composition. Journal of Crystal Growth, 312(8), 1118-1121.
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  Abstract: We investigated CsLiB6 O10 (CLBO) crystal growth in a dry atmosphere and from a stoichiometric melt composition with the aim of obtaining CLBO crystals containing low levels of water as an impurity. We qualitatively compared the amounts of water incorporated into CLBO crystals using a FT-IR spectrometer. It was found that CLBO crystals grown under the above conditions included a lower level of water than those grown in an ambient atmosphere from B2 O3 - poor solution. © 2009 Elsevier B.V. All rights reserved.
• Yoshimura, M., Shimizu, Y., Kawamura, T., Matsuki, K., Iida, S., Imai, S., Kaneda, Y., Hirohashi, J., Miyamoto, A., Furukawa, Y., Kitaoka, Y., Mori, Y., & Sasaki, T. (2010). Characterization of CsLiB₆O₁₀ Crystals grown in dry atmosphere. Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010.
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  Abstract: We attempted the growth of CsLiB6O10 in dry atmosphere. Devices fabricated from dry-grown crystal had demonstrated 1 week of continuous operation without shining the crystal at the output power of 100 mW at 199 nm. © 2010 Optical Society of America.
• Urata, Y., Shinozaki, T., Wada, Y., Kaneda, Y., Wada, S., & Imai, S. (2009). Deep UV light generation by a fiber/bulk hybrid amplifier at 199nm. Applied Optics, 48(9), 1668-1674.
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  PMID: 19305464;Abstract: A high-pulse-repetition-frequency (PRF) pulsed light source in the deep ultraviolet region has been realized by a multiple wavelength conversion technique using a hybrid fiber/bulk amplifier system. Output of 199 nm with a power of 50 mW was achieved at 2.4 MHz PRF. The 1μm amplifier consisted of a Yb-doped fiber amplifier and a Nd-doped YVO4 amplifier. A 1.5 μm fiber master-oscillator power amplifier was employed as the other fundamental source. The amplifiers exhibited good amplification properties in pulse energy, polarization extinction ratio, and spectrum for nonlinear wavelength conversion. © 2009 Optical Society of America.
• Du, S., Kaneda, Y., & Yarborough, M. (2008). Absorption measurement of a 50-mm-Long periodically poled lithium niobate optical parametric oscillator pumped at 1064 nm by a Nd: YAG laser. Laser Physics, 18(8), 968-971.
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  Abstract: We measured the absorption of different periodically poled lithium niobate crystals when different wavelength beams come through them. The choice of a periodically poled lithium niobate crystal is utilized by a singly resonant oscillator to efficiently generate 3800-nm light when it is pumped by a 1064-nm laser and to generate the 2600-nm signal, and, then, injection seeded at 1550 nm. The temperature-tuning curve and idler output power of the chosen crystal are measured. © 2008 Pleiades Publishing, Ltd.
• Shisen, O. u., Kaneda, Y., & Yarborough, M. (2008). 488 NM ultraviolet light generated by vecsel and V-cavity second-harmonic generation using lithium triborate. Microwave and Optical Technology Letters, 50(11), 2892-2894.
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  Abstract: We report an optically pumped vertical external cavity surface-emitting laser based on InGaAs/GaAs single wavelength continuous-wave output beam at 977 nm. V-Cavity second-harmonic generation was achieved in lithium triborate to produce 480 mW at 488 nm in output beams. There is no significance decrease in second harmonic output power up to 3 h test. © 2008 Wiley Periodicals, Inc.
• Shinozaki, T., Kaneda, Y., Urata, Y., & Wada, S. (2006). Continuous-wave visible laser by intracavity-doubled fiber laser. Proceedings of SPIE - The International Society for Optical Engineering, 6100.
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  Abstract: A novel continuous-wave blue-green laser was developed by the second-harmonic generation of the emission from Yb-doped gain fiber. The laser cavity consists of a fiber Bragg grating (FBG), a gain fiber, an aspheric lens, a dichroic mirror for output coupling of second harmonic, a periodically-poled LiNbO3 (PPLN), and a high reflector. The intracavity-doubled fiber laser was pumped by a 580-mW, fiber pigtailed laser diode at 974nm through the FBG. The Yb laser emission from the fiber end was focused onto the high reflector, providing optical feedback and forming the resonator. The PPLN was placed near the flat end mirror, where the waist is formed, in order to increase the fundamental intensity. The emission wavelength can be selected by changing the FBG within the bandwidth of the gain fiber. An FBGs for 1017.6 nm was selected for the experiment. Circulating power of the fundamental wave in the cavity was measured to be approximately 1500 mW when a 5% output coupler was placed instead of high-reflecting mirror. Stable output in excess of 30 mW at 508.8 nm was obtained. The optical-optical efficiency from the pump power to the visible output was about 5%. The fluctuation of the laser output power was less than 0.5% for more than 2 hours without a power feedback loop. The M 2 value was measured to be 1.2. Wavelength-selectable lasers will be useful for applications including fluorescent microscopy, biological imaging, flow cytometry and spectroscopic analysis.
• Kaneda, Y., Yongdan, H. u., Spiegelberg, C., Geng, J., & Jiang, S. (2004). Single-frequency, all-fiber Q-switched laser at 1550 nm. OSA Trends in Optics and Photonics Series, 94, 126-130.
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  Abstract: We present a novel actively Q-switched single frequency, linear, all-fiber laser using fast stress-induced birefringence modulation. We demonstrate 25-W peak power in 12-ns, 0.3-μJ pulses at a repetition rate of 80 kHz with 370 mW of pump power, without using an amplifier. Very effective Q-switching was also observed at 325 kHz, near the resonance frequency of the piezoelectric actuator. Using a higher pump power of 780 mW, an average output power of 85 mW and pulsewidth of 16 ns at 325 kHz PRF was observed.
• Kaneda, Y., Zong, J., Romero, O., Deng, Z., Case, B., Chavez-Pirson, A., Paysnoe, G., Whitwham, J., Moran, P., Rohan, P., Wang, Z., Jiang, S., Eaton, W., Brutsch, M., Ping, L. i., & Song, I. (2003). Novel total-internal-reflection pump-signal coupler with >90% pump coupling efficiency from a broad-area diode laser into a double-clad fiber. Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, 2, 798-799.
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  Abstract: A novel technique for coupling multi-mode pump light from a broad-area laser into a double-clad fiber (DCF) that enables efficient, robust and compact devices is presented. This configuration, called the total internal reflection (TIR) coupler, allows coupling into DCFs with small inner-clad diameters with higher pump brightness than presently obtainable. This paper demonstrates a coupling efficiency exceeding 90% with negligible effect on the single-mode signal.
• Spiegelberg, C., Geng, J., Hu, Y., Luo, T., Kaneda, Y., Wang, J., Li, W., Brutsch, M., Hocde, S., Chen, M., Babico, J., Barry, K., Eaton, W., Blake, M., Eigen, D., Song, I., & Jiang, S. (2003). Compact 100 mW fiber laser with 2 kHz linewidth. Conference on Optical Fiber Communication, Technical Digest Series, 86, 935-937.
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  Abstract: A novel single frequency fiber laser with more than 100 mW output is presented. Low noise and a coherence length of >75 km make this laser extremely useful in sensing, LIDAR, and coherent communication applications. © 2003 Optical Society of America.
• Kaneda, Y., Oka, M., & Kubota, S. (1999). Injection locking of intracavity SHG lasers. Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, 2, 854-855.
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  Abstract: To obtain an efficient and stable single-frequency green laser source, up to 100% output from the incident fundamental power to the second harmonic output is proposed by placing a booster within an extremely resonant doubler. A 0.5 W Nd-YAG NPRO was used as the master laser. The simulation assumed three parameters, namely, that the coupling efficiency of the pump is 65%, that the transmission efficiency at SHG is 75%, and that the passive loss of the resonator is 0.2%. It was found that the threshold of parasitic oscillation can be increased by introducing a directional loss within the resonator.
• Kaneda, Y., Kubota, S., Yamatsu, H., Furuki, M., Kurokawa, K., & Kashiwagi, T. (1998). Disk mastering process with an all-solid-state ultraviolet laser. Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 37(4 SUPPL. B), 2124-2129.
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  Abstract: The mastering process of the optical disk is demonstrated using an all-solid-state ultraviolet laser for the first time. A 355-nm emission is obtained by the nonlinear frequency mixing between 1064nm and 532nm using β-BaB2O4 crystal in an external resonator. The laser head is efficient hence it does not require water cooling. A 30% improvement over the argon ion gas lasers is obtained in the track pitch variation with the 0.74μm-pitch-tracks. The absence of the water flow for the cooling is the reason for the improvement. The optics designed at 351 nm turned out to be compatible with the 355-nm laser source.
• Kaneda, Y., & Kubota, S. (1997). CW solid-state ultraviolet laser for optical disk mastering application. IEEE Journal on Selected Topics in Quantum Electronics, 3(1), 35-39.
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  Abstract: We have built a prototype laser head that emits 355-iun ultraviolet light in CW mode. The system is based on nonlinear sum-frequency mixing using a β-BaB 2O 4 (BBO) crystal in an external resonator in which two input emissions at 1064 and 532 nm are resonantly enhanced simultaneously. The output exhibits promising characteristics as the master recording laser source, in terms of beam shape and intensity stability. The result of reliability testing of the system in 1000-h real-time operation is also discussed.
• Kaneda, Y., & Kubota, S. (1997). Theoretical treatment, simulation, and experiments of doubly resonant sum-frequency mixing in an external resonator. Applied Optics, 36(30), 7766-7775.
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  PMID: 18264298;Abstract: We describe the theoretical treatment of the doubly resonant sum-frequency mixing in an external resonator. The nonlinear conversion efficiency is increased by the resonantly enhanced circulating powers at both wavelengths. The model predicts the circulating powers in the resonator at two input wavelengths: the powers that are reflected off the input coupler and the output power at the sum frequency. Numerical simulation gives the design optimization of the system. The result of the simulation is compared with the result of a continuous-wave 355-nm generation experiment, where 0.66-W of output power was obtained. © 1997 Optical Society of America.
• Kaneda, Y., & Kubota, S. (1996). Continuous wave 355-nm all solid-state laser. Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, 236-.
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  Abstract: This paper reports on generation of 410 mW of 355-nm output by doubly-resonant sum-frequency mixing. In order to simultaneously enhance both inputs, two independent single-frequency lasers as well as two independent servo loops are used. The first servo loop locks the mixing cavity to the first laser, while the second loop locks the frequency of the second laser to the external cavity. Double-resonance is achieved when both of the servo loops are closed. Under the double-resonance, enhanced fields are built up in the cavity at both input wavelengths, hence increasing the nonlinear conversion efficiency.
• Oka, M., Masuda, H., Kaneda, Y., & Kubota, S. (1992). Laser-diode-pumped phase-locked Nd:YAG laser arrays. IEEE Journal of Quantum Electronics, 28(4), 1142-1147.
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  Abstract: Scaling of an efficient and compact diode-end-pumped Nd:YAG laser was demonstrated by two-dimensional phase-locked arrays. The arrays of stable resonators were formed by multiple thermal lenses induced by the simultaneous end-pumping of laser-diode-coupled fibers. Because of partial overlap of each transverse mode, the output was phase locked. Various configurations of pumping fibers were tested to study phase locking. It was found that minimization of the coherently coupled intensity between adjacent array elements have good prediction for phase difference between modes. When the plane parallel cavity as long as 30 mm was pumped by 2 × 2 laser diode coupled fibers, phase-locked 1.8-W continuous wave 1.06-μm output was obtained with 55% slope efficiency. 1.2-W single longitudinal mode output with single-lobe beam profile was obtained by using a spatial phase filter and the twisted mode method.
• Kubota, S., Oka, M., Kaneda, Y., & Masuda, H. (1990). Thermal aberration analysis of a laser-diode-pumped Nd. YAG laser. Proceedings of SPIE - The International Society for Optical Engineering, 1354, 572-580.
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  Abstract: A recently developed powerful GaAlAs laser diode (LD) has excellent spectral match to absorption band of Nd:YAG crystal (808nm) and can be focused into a spot which well coincides with the fundamental laser resonator mode. These properties of the LD allow to build an efficient diode-pumped Nd:YAG laser. We have stabilized an intra-cavity frequency-doubled Nd:YAG laser with a KTiOPO4 (KTP) doubler using a quarter wave plate (QWP) to decouple the polarization mode interaction inside the cavity. With this technique, relative intensity noise (RIN) of -160 dB/Hz was obtained at 0 dBm input. The shot noise-limited green laser can be used in read out of a tripled density optical disk in NTSC format and in MUSE format.
• Morita, R., Ito, R., Kondo, T., Kaneda, Y., Sugihashi, A., & Umegaki, S. (1988). Multiple-reflection effects in optical second-harmonic generation. Japanese Journal of Applied Physics, Part 2: Letters, 27 pt 2(6), L1134-L1136.
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  Abstract: We report the first observation of multiple-reflection effects in optical second-harmonic generation. The observation has been made possible by the use of a single-mode laser diode as a light source. The experimental results agree excellently with a theoetical analysis which takes account of the multiple reflections of both the fundamental and harmonic waves.
• Morita, R., Kondo, T., Kaneda, Y., Sugihashi, A., Ogasawara, N., Umegaki, S., & Ito, R. (1988). Dispersion of second-order nonlinear optical coefficient d₁₁ of 2-methyl-4-nitroaniline (MNA). Japanese Journal of Applied Physics, Part 2: Letters, 27 pt 2(6), L1131-L1133.
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  Abstract: Results of measurement of the dispersion of the second-order nonlinear optical coefficient d11 of 2-methyl-4-nitroaniline (MNA) are presented over a wavelength range of 1.20 to 1.54 μm. Laser diodes are used as light sources. The nonlinear coefficient strongly depends on wavelength, exhibiting a resonance enhancement.