業績リスト
黒：産総研入所後、茶：入所前
【原著論文】
- 24. Magneto-optical trap with a hollow grating and an additional retroreflected laser beam
- Akifumi Takamizawa, Ryohei Hokari, Sota Kagami, Thu H. H. Le, Kenta Matsumoto, Ryohei Takei, Ken Hagimoto, and Shinya Yanagimachi
- Applied Physics Letters 126(24), 244006 (2025).
https://doi.org/10.1063/5.0250597
- 23. Continuous frequency tuning of an external cavity diode laser significantly beyond the free spectral range by sweeping the injection current
- Akifumi Takamizawa
- Optics Express 32(1), 774-784 (2024).
https://doi.org/10.1364/OE.506528
- 22. Search for ultralight dark matter from long-term frequency comparisons of optical and microwave atomic clocks
- Takumi Kobayashi,Akifumi Takamizawa, Daisuke Akamatsu, Akio Kawasaki, Akiko Nishiyama, Kazumoto Hosaka, Yusuke Hisai, Masato Wada, Hajime Inaba, Takehiko Tanabe, and Masami Yasuda
- Physical Review Letters 129, 241301 (2022).
https://doi.org/10.1103/PhysRevLett.129.241301
- 21. First uncertainty evaluation of the cesium fountain primary frequency standard NMIJ-F2
- Akifumi Takamizawa, Shinya Yanagimachi, and Ken Hagimoto
- Metrologia, 59, 035004 (2022).
https://doi.org/10.1088/1681-7575/ac5e7b
- 20. Surface activated room-temperature bonding in Ar gas ambient for MEMS
- Hideki Takagi, Yuichi Kurashima, Akifumi Takamizawa, Takeshi Ikegami, and Shinya Yanagimachi
- Japanese Journal of Applied Physics 57(2S1), 02BA04 (2018).
https://doi.org/10.7567/JJAP.57.02BA04
- 18. External cavity diode laser with very-low frequency drift
- Akifumi Takamizawa, Shinya Yanagimachi, and Takeshi Ikegami
- Applied Physics Express 9, 032704 (2016). http://dx.doi.org/10.7567/APEX.9.032704
- 17. Improved frequency measurement of the 1S0-3P0 clock transition in 87Sr using a Cs fountain clock as a transfer oscillator
- Takehiko Tanabe, Daisuke Akamatsu, Takumi Kobayashi, Akifumi Takamizawa, Shinya Yanagimachi, Takeshi Ikegami,
- Tomoya Suzuyama, Hajime Inaba, Sho Okubo, Masami Yasuda, Feng-Lei Hong, Atsushi Onae, and Kazumoto Hosaka
- Journal of the Physical Society of Japan, 84, 115002 (2015).
http://dx.doi.org/10.7566/JPSJ.84.115002
- 16. Preliminary evaluation of the cesium fountain primary frequency standard NMIJ-F2
- Akifumi Takamizawa, Shinya Yanagimachi, Takehiko Tanabe, Ken Hagimoto, Iku Hirano, Ken-ichi Watabe, Takeshi Ikegami, John G. Hartnett
- IEEE Transactions on Instrumentation and Measurement, 64 (9), 2504-2512 (2015).
http://dx.doi.org/10.1109/TIM.2015.2415015
- 15. External cavity diode laser with frequency drift following natural variation in air pressure
- Akifumi Takamizawa, Shinya Yanagimachi, Takeshi Ikegami, and Ryuzo Kawabata
- Applied Optics, 54 (18), 5777-5781 (2015). https://doi.org/10.1364/AO.54.005777
- 14. Atomic fountain clock with very high frequency stability employing a pulse-tube-cryocooled sapphire oscillator
- Akifumi Takamizawa, Shinya Yanagimachi, Takehiko Tanabe, Ken Hagimoto, Iku Hirano, Ken-ichi Watabe, Takeshi Ikegami, and John G. Hartnett
- IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 61 (9), 1463-1469 (2014).
https://doi.org/10.1109/TUFFC.2014.3060
- 13. Generation of incoherent light from a laser diode subject to external optical injection from a superluminescent diode
- Akifumi Takamizawa, Shinya Yanagimachi, and Takeshi Ikegami
- Applied Optics, 53 (3), 435-440 (2014). https://doi.org/10.1364/AO.53.000435
- 12. Spin polarization in a freely evolving sample of cold atoms
- Krzysztof Szymaniec, Heung-Ryoul Noh, Sang Eon Park, Akifumi Takamizawa
- Applied Physics B, 111 (3), 527-535 (2013). https://doi.org/10.1007/s00340-013-5368-7
- 11. Proposal of a truncated atomic beam fountain for reduction of collisional frequency shift
- Akifumi Takamizawa, Y. Shirakawa, S. Yanagimachi, T. Ikegami
- Physical Review A, 82, 013632 (2010). https://doi.org/10.1103/PhysRevA.82.013632
- 10. Measuring the frequency of a Sr optical lattice clock using a 120-km coherent optical Transfer
- F.-L. Hong, M. Musha, M. Takamoto, H. Inaba, S. Yanagimachi, Akifumi Takamizawa, K. Watabe, T. Ikegami,
- M. Imae, Y. Fujii, M. Amemiya, K. Nakagawa, K. Ueda, H. Katori
- Optics Letters, Vol. 34 Issue 5, 692-694 (2009). https://doi.org/10.1364/OL.34.000692
- 9. High-contrast dark resonances with linearly polarized light on the D1 line of alkali atoms with large nuclear spin
- K. Watabe, T. Ikegami, Akifumi Takamizawa, S. Yanagimachi, S. Ohshima, S. Knappe
- Applied Optics，48-6, 1098-1103 (2009). https://doi.org/10.1364/AO.48.001098
- 8. Cryogenic-Sapphire-Oscillator-Based Reference Signal at 1 GHz with 10^-15 Level Instability
- K. Watabe, S. Yanagimachi, Akifumi Takamizawa, T. Ikegami, S. Ohshima, G. Santarelli, C. R. Locke, J. G. Hartnett
- Japanese Journal of Applied Physics, 47, 7390-7392 (2008). http://dx.doi.org/10.1143/JJAP.47.7390
- 7. Miniature fluorescence detector for single atom observation on a microchip
- Akifumi Takamizawa, T. Steinmetz, R. Delhuille, T. W. Hansch, J. Reichel
- Optics Express, 14, 10976-10983 (2006). https://doi.org/10.1364/OE.14.010976
- 6. Littrow-type external-cavity diode laser with a triangular prism for suppression of the lateral shift of output beam
- Akifumi Takamizawa, G. Yonezawa, H. Kosaka, K. Edamatsu
- Review of Scientific Instruments, 77, 046102 (2006). http://dx.doi.org/10.1063/1.2190287
- 5. Deflecting, focusing, and funneling atoms by near-field light
- H. Ito, K. Yamamoto, Akifumi Takamizawa, H. Kashiwagi, T. Yatsui
- Journal of Optics A: Pure and Applied Optics, 8, S153-S160 (2006).
http://dx.doi.org/10.1088/1464-4258/8/4/S16
- 4. Observation of cold atom output from an evanescent-light funnel
- Akifumi Takamizawa, H. Ito, S. Yamada, M. Ohtsu
- Applied Physics Letters, 85, 1790-1792 (2004). http://dx.doi.org/10.1063/1.1786362
- 3. Accumulative Atom Detection by Magneto-Optical Trap for Near-Field Optical Funnel
- Akifumi Takamizawa, H. Ito, S. Yamada, M. Ohtsu,
- Japanese Journal of Applied Physics, Part 1, 42, 3658-3661 (2003).
http://dx.doi.org/10.1143/JJAP.42.3658
- 2. Multireflection of Cold Atoms in a Near-Field Optical Funnel
- Akifumi Takamizawa, H. Ito, M. Ohtsu,
- Japanese Journal of Applied Physics, Part 1, 41, 6215-6218 (2002).
http://dx.doi.org/10.1143/JJAP.41.6215
- 1. High Efficiency Excitation of Cylindrical Optical Near Fields for Atom Guidance
- Akifumi Takamizawa, H. Ito, M. Ohtsu,
- Japanese Journal of Applied Physics, Part 1, 39 (2000) 6737-6742.
http://dx.doi.org/10.1143/JJAP.39.6737
【特許】
- 3. ガスセル、原子時計および原子センサ
- 特許第6685565号
- 出願番号：特願2018-543834、公開番号：WO2018/066377
- 出願日：2017年9月21日、公開日：2019年4月18日
- 柳町真也、池上健、高木秀樹、高見澤昭文、倉島優一
- 出願人：国立研究開発法人産業技術総合研究所
- 2. 高パワーインコヒーレント光発生装置
- 特許第6090780号
- 出願番号：特願2013-011378、公開番号：特開2014-143320
- 出願日：2013年1月24日、公開日：2014年8月7日
- 発明者：高見澤昭文、柳町真也、池上健
- 出願人：（独）産業技術総合研究所
- 1. リトロー型外部共振器半導体レーザーにおける光軸のずれの補正方法および装置
- 特許第3795500号
- 出願番号：特許出願2004-140503、公開番号：特許公開2005-322813
- 出願日：2004年5月11日、公開日：2005年11月17日
- 発明者：高見澤昭文、枝松 圭一
- 出願人：科学技術振興機構
【国際会議プロシーディング（主なもの）】
- 9. Cesium fountain primary frequency standard NMIJ-F2 with uncertainty evaluated
- Akifumi Takamizawa, Shinya Yanagimachi, Ken Hagimoto
- Proceeding of Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS), Toyama, May 2023, paper number 7263.
- 8. Recent Progress of Development of Cesium Fountain Primary Frequency Standard NMIJ-F2
- Akifumi Takamizawa, Shinya Yanagimachi, Ken Hagimoto, Iku Hirano, Takeshi Ikegami
- Proceeding of European Frequency and Time Forum, Turin, April 2018, pp. 94-97.
- 7. Autonomous cryogenic sapphire oscillators employing low vibration pulse-tube cryocoolers at NMIJ
- Takeshi Ikegami, Ken-ichi Watabe, Shinya Yanagimachi, Akifumi Takamizawa, John G. Hartnett
- Symposium on Frequency Standards and Metrology, October 2015, Potsdam
- Journal of Physics: Conference Series, 723, 012032 (2016).
- 6. Development of the Cesium Fountain Frequency Standard, NMIJ-F2
- Akifumi Takamizawa, Shinya Yanagimachi, Takehiko Tanabe, Ken Hagimoto, Iku Hirano, Ken-ichi Watabe, Takeshi Ikegami, John G. Hartnett
- Proceeding of European Frequency and Time Forum, Neuchatel, June 2014, pp. 394-397.
- 5. Dual-Mixer Time-Difference Measurement system using Dis-crete Fourier Transformation
- Shinya Yanagimachi, Akifumi Takamizawa, Takehiko Tanabe, Ken Hagimoto, Takeshi Ikegami
- Proceeding of European Frequency and Time Forum, Prague, July 2013, pp. 310-313.
- 4. Cesium Atomic Fountain Clocks at NMIJ
- Akifumi Takamizawa, Shinya Yanagimachi, Ken-ichi Watabe, Ken Hagimoto, Takeshi Ikegami
- Proceeding of Precise Time and Time Interval, Reston, November 2010, vol. 42, pp.321-328.
- 3. Recent Development of the Fountain Frequency Standard at NMIJ
- Akifumi Takamizawa, S. Yanagimachi, A. Yanagimachi, Y. Yoshida, K. Watabe, K. Hagimoto, T. Ikegami
- Proceeding of European Frequency and Time Forum, Toulouse, April 2008, paper number EPB17-0129.
- 2. Cold-atom output from a near-field optical funnel
- Akifumi Takamizawa, Haruhiko Ito, Shungo Yamada, Motoichi Ohtsu
- IEEE-NANO 2003, San Francisco, August 2003, paper number WD5.
- 1. Precise control of atoms with optical near fields: deflection and trap
- Haruhiko Ito, Akifumi Takamizawa, Hideaki Tanioka, Motoichi Ohtsu
- Proceeding of SPIE, Colorado, July 1999, vol. 3791, pp. 2-9 (1999).
【プレプリント】
- 2. Spatial intensity distribution of light under coherent interaction with single atoms
- Akifumi Takamizawa, K. Shimoda
- arXiv:1204.4973 (2012). https://arxiv.org/abs/1204.4973
【紀要等】