Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies
if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the
same subfield and year (this is the minimum needed to enter the top 1%, not the average
within it), or reaches the top citation threshold in at least one of its specific research
topics.
Surface emitting semiconductor lasers
1988459 citationsKenichi Iga, Fumio Koyama et al.profile →
Peers — A (Enhanced Table)
Peers by citation overlap · career bar shows stage (early→late)
cites ·
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This map shows the geographic impact of Fumio Koyama'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 Fumio Koyama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Fumio Koyama more than expected).
This network shows the impact of papers produced by Fumio Koyama. 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 Fumio Koyama. The network helps show where Fumio Koyama may publish in the future.
Co-authorship network of co-authors of Fumio Koyama
This figure shows the co-authorship network connecting the top 25 collaborators of Fumio Koyama.
A scholar is included among the top collaborators of Fumio Koyama based on the total number of
citations received by their joint publications. Widths of edges
represent the number of papers authors have co-authored together.
Node borders
signify the number of papers an author published with Fumio Koyama. Fumio Koyama is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Gu, Xiaodong, et al.. (2016). VCSEL-integrated Bragg reflector waveguide amplifier with single-mode output power over 10 mW. International Conference on Photonics in Switching. 1–3.3 indexed citations
Imamura, Akihiro, et al.. (2011). Transverse mode control of vcsels using highly angular dependent high contrast sub-wavelength grating. 1–2.1 indexed citations
8.
Koyama, Fumio, et al.. (2011). Lateral integration of VCSEL and slow light amplifier. 271–272.
9.
Koyama, Fumio. (2009). VCSEL photonics -advances and new challenges-:—advances and new challenges—. IEICE Electronics Express. 6(11). 651–672.3 indexed citations
10.
Arai, M., et al.. (2002). Single High-Order Transverse Mode Surface Emitting Laser with Micromachined Surface Relief. IEICE Transactions on Electronics. 85(4). 995–1000.3 indexed citations
11.
Nishiyama, Nobuhiko, et al.. (2001). GalnAs/GaAs Single Mode Veritical Cavity Surface Emitting Laser (VCSEL) Array on GaAs (311)B. IEICE Transactions on Electronics. 84(3). 331–338.1 indexed citations
Hatori, Nobuaki, et al.. (1996). N-type modulation-doped strained InGaAs/AlGaAs quantum well lasers grown by metal organic chemical vapor deposition. Conference on Lasers and Electro-Optics. 184–185.1 indexed citations
Hatori, Nobuaki, et al.. (1995). 0.33-mA-threshold InGaAs/GaAs vertical-cavity surface-emitting lasers grown by MOCVD. Tokyo Tech Research Repository (Tokyo Institute of Technology).2 indexed citations
Shimizu, Mitsuaki, Fumio Koyama, & Kenichi Iga. (1991). Transverse Mode Analysis for Surface Emitting Laser Using Beam Propagation Method. IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences. 74(10). 3334–3341.15 indexed citations
20.
Shimizu, Mitsuaki, Fumio Koyama, & Kenichi Iga. (1989). Estimation of Diffraction Loss in Surface Emitting Laser Cavity by Beam Propagation Method. IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences. 72(10). 1050–1051.2 indexed citations
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.