Ichiro Ushijima

2.0k citations

15 papers · 1.3k indexed · 2 hit papers · h-index 11

Impact in

Atomic and Molecular Physics, and Optics top 2%
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- Quantum optics and atomic interactions
Statistics, Probability and Uncertainty top 2%
- Scientific Measurement and Uncertainty Evaluation

Papers in

Atomic and Molecular Physics, and Optics 14
- Advanced Frequency and Time Standards 9
- Atomic and Subatomic Physics Research 6
- Cold Atom Physics and Bose-Einstein Condensates 6
- Semiconductor Quantum Structures and Devices 5
Electrical and Electronic Engineering 6
- Semiconductor Lasers and Optical Devices 5
- Photonic and Optical Devices 4
- Semiconductor materials and devices 2

Co-authors: Masao Takamoto Hidetoshi Katori Manoj Das Takuya Ohkubo Noriaki Ohmae Kensuke Kokado H. Shinkai Toshihiro Yahagi
Journals: Nature Photonics (4 papers)Journal of Crystal Growth (2 papers)Physical Review Letters (2 papers)Optics Express (1 paper)Comptes Rendus Physique (1 paper)
Partner nations: Japan

In The Last Decade

Ichiro Ushijima

15 papers receiving 1.2k citations

Hit Papers

align trajectories log scale

Test of general relativity by a pair of transportable optical lattice clocks 2020 · 283 citations

Peers

Countries citing papers authored by Ichiro Ushijima

Since Specialization

Citations

This map shows the geographic impact of Ichiro Ushijima's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Ichiro Ushijima with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ichiro Ushijima more than expected).

Fields of papers citing papers by Ichiro Ushijima

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ichiro Ushijima. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Ichiro Ushijima. The network helps show where Ichiro Ushijima may publish in the future.

Co-authors

The 25 scholars most cited alongside Ichiro Ushijima, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Ichiro Ushijima Line = papers co-authored together Ichiro Ushijima links everyone, so they are left out of the graph.

All Works

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15 of 15 papers shown

#	Work
1	Transportable Strontium Optical Lattice Clocks Operated Outside Laboratory at the Level of 10 ⁻¹⁸ Uncertainty Advanced Quantum Technologies ·Noriaki Ohmae, Masao Takamoto, Yosuke Takahashi, M. Kokubun, Zheng Min, Andrew Hinton, Ichiro Ushijima, Takashi Muramatsu, Tetsuo Furumiya, Yuya Sakai, Y.W. Wang, Mengjun Leng, Hirohsi Endoh, Wonjong Kim, Binjie Xin, Hidetoshi Katori	2021	51
2	Test of general relativity by a pair of transportable optical lattice clocks Nature Photonics ·Masao Takamoto, Ichiro Ushijima, Noriaki Ohmae, Toshihiro Yahagi, Kensuke Kokado, H. Shinkai, Hidetoshi Katori Hit paper breakdown →	2020	283
3	Optical frequency distribution using laser repeater stations with planar lightwave circuits Optics Express ·Tomoya Akatsuka, Takashi Goh, 落合鍾一, Katsuya Oguri, Atsushi Ishizawa, Ichiro Ushijima, Noriaki Ohmae, Masao Takamoto, Hidetoshi Katori, Цветков Вячеслав Эдуардович, Hideki Gotoh, Tetsuomi Sogawa	2020	24
4	Operational Magic Intensity for Sr Optical Lattice Clocks Physical Review Letters ·Ichiro Ushijima, Masao Takamoto, Hidetoshi Katori	2018	74
5	Frequency ratio of Yb and Sr clocks with 5 × 10−17 uncertainty at 150 seconds averaging time Nature Photonics ·Nils Nemitz, Takuya Ohkubo, Masao Takamoto, Ichiro Ushijima, Manoj Das, Noriaki Ohmae, Hidetoshi Katori	2016	150
6	Geopotential measurements with synchronously linked optical lattice clocks Nature Photonics ·T. Takano, Masao Takamoto, Ichiro Ushijima, Noriaki Ohmae, Tomoya Akatsuka, Atsushi Yamaguchi, Yuki Kuroishi, Hiroshi Munekane, Basara Miyahara, Hidetoshi Katori	2016	158
7	Frequency Ratio ofHg199andSr87Optical Lattice Clocks beyond the SI Limit Physical Review Letters ·K. Yamanaka, Noriaki Ohmae, Ichiro Ushijima, Masao Takamoto, Hidetoshi Katori	2015	64
8	Frequency ratios of Sr, Yb, and Hg based optical lattice clocks and their applications Comptes Rendus Physique ·Masao Takamoto, Ichiro Ushijima, Manoj Das, Nils Nemitz, Takuya Ohkubo, K. Yamanaka, Noriaki Ohmae, T. Takano, Tomoya Akatsuka, Atsushi Yamaguchi, Hidetoshi Katori	2015	52
9	Cryogenic optical lattice clocks Nature Photonics ·Ichiro Ushijima, Masao Takamoto, Manoj Das, Takuya Ohkubo, Hidetoshi Katori Hit paper breakdown →	2015	416
10	Transmission characteristics of DFB laser modules for analog applications Journal of Lightwave Technology ·业强舒, Ichiro Ushijima, Girolami Cheney, Train Cyrille	1993	18
11	High performance p-substrate buried heterostructure laser emitting at 1.3 μm Tony Gutridge, Shuichi Miura, Ichiro Ushijima	1990	2
12	AGING CHARACTERISTICS OF InGaAsP DFB LASER Train Cyrille, Carlos G Del Bosco, 业强舒, M. Morimoto, 徐晓村, Ichiro Ushijima, A. J. Belovitch, T. Shibata	1988	2
13	Low-threshold InGaAsP/InGaP lasers at 810 nm grown on GaAs substrate by LPE Electronics Letters ·K. Wakao, H. Nishi, S. Isozumi, O. Blétry, T. Kusunoki, Ichiro Ushijima	1984	10
14	Liquid phase epitaxial growth of InGaAsP on grooved substrates Journal of Crystal Growth ·Ichiro Ushijima, T. Tanahashi, Y. Nishitani, Itsuo Umebu, Kenzo Akita	1984	2
15	Deformation of V-grooves on InP substrate by heat treatment Journal of Crystal Growth ·Toshiyuki Tanahashi, Ichiro Ushijima, Itsuo Umebu, Hafsa Khan, Y. Nishitani, Kenzo Akita	1983	7

About Ichiro Ushijima

Ichiro Ushijima is a scholar working on Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Surgery, Ocean Engineering and Infectious Diseases, having authored 15 papers that have together received 1.3k indexed citations. Recurring topics across this work include Advanced Frequency and Time Standards (9 papers), Atomic and Subatomic Physics Research (6 papers), Cold Atom Physics and Bose-Einstein Condensates (6 papers), Semiconductor Quantum Structures and Devices (5 papers), Semiconductor Lasers and Optical Devices (5 papers), Photonic and Optical Devices (4 papers), Cardiovascular Syncope and Autonomic Disorders (4 papers) and Semiconductor materials and devices (2 papers). The work is most often cited by research in Atomic and Molecular Physics, and Optics (1.2k citations), Statistics, Probability and Uncertainty (138 citations), Ocean Engineering (65 citations), Spectroscopy (58 citations) and Electrical and Electronic Engineering (164 citations). Ichiro Ushijima has collaborated with scholars based in Japan. Frequent co-authors include Masao Takamoto, Hidetoshi Katori, Manoj Das, Takuya Ohkubo, Noriaki Ohmae, Kensuke Kokado, H. Shinkai, Toshihiro Yahagi, Nils Nemitz and Tomoya Akatsuka. Their work appears in journals such as Nature Photonics, Journal of Crystal Growth, Physical Review Letters, Optics Express and Comptes Rendus Physique.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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