Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Masahiro Uemukai"'
Autor:
Tomoaki Nambu, Masashi Yoshimura, Yusuke Mori, Yasufumi Fujiwara, Ryota Ishii, Yoichi Kawakami, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama
Publikováno v:
Applied Physics Express, Vol 17, Iss 8, p 082004 (2024)
We have proposed highly efficient microcavity wavelength conversion devices that do not utilize the birefringence or ferroelectricity of crystals. In this study, we utilized a low-birefringence paraelectric SrB _4 O _7 crystal with significant potent
Externí odkaz:
https://doaj.org/article/eae524b613e247fe85a90b115c2016cd
Autor:
Toshihiko Fukamachi, Junichi Nishinaka, Koichi Naniwae, Shuichi Usuda, Haruki Fukai, Akihiko Sugitani, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama
Publikováno v:
Applied Physics Express, Vol 17, Iss 5, p 052004 (2024)
We have developed a GaN-based distributed feedback laser diode (DFB-LD) with the detuning of +5 nm to obtain a smaller temperature dependence of the threshold current. We found that the current-light characteristics almost overlapped up to 300 mW bet
Externí odkaz:
https://doaj.org/article/2ae0e891c5564c379567699d14687ffa
Autor:
Taisei Kusui, Takumi Wada, Naritoshi Matsushita, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama
Publikováno v:
Applied Physics Express, Vol 17, Iss 8, p 082003 (2024)
By introducing wavelength tunability, InGaN single longitudinal mode lasers can be used for pumping wavelength conversion devices with a small pump wavelength tolerance. A 405 nm InGaN tunable slotted laser was designed and fabricated by a simple pro
Externí odkaz:
https://doaj.org/article/26ec5a37f7984b5ea593b34f6a5019c3
Autor:
Hiroto Honda, Soshi Umeda, Kanako Shojiki, Hideto MIYAKE, Shuhei Ichikawa, Jun Tatebayashi, Yasufumi FUJIWARA, Kazunori Serita, Hironaru Murakami, Masayoshi Tonouchi, Masahiro Uemukai, Tomoyuki TANIKAWA, Ryuji KATAYAMA
Publikováno v:
Applied Physics Express.
Far-ultraviolet (UV) light sources have attracted much attention for human safe viral inactivation and bacterial disinfection. Due to large optical nonlinearity and transparency to this wavelength region, second harmonic generation (SHG) device made
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::280357ebf85ef0cd7f50ce72d1fa3775
https://doi.org/10.35848/1882-0786/acda79
https://doi.org/10.35848/1882-0786/acda79
Autor:
Yuto Minami, 'Kenichi Fushimi\\', 'Akihiro Hashimoto\\', 'Ryuta Hazama\\', 'Tasuku Hiraiwa\\', 'Takashi Iida\\', 'Yumiko Kishida\\', 'Tadafumi Kishimoto\\', 'Pantiwa Kumsut\\', 'Kenji Matsuoka\\', 'Noriaki Miyanaga\\', 'Go Miyoshi\\', 'Yoshiki Muramatsu\\', 'Kyohei Nakajima\\', 'Jun'ya Nakajima\\', 'Hideaki Niki\\', 'Yudai Niwa\\', 'Izumi Ogawa\\', 'Hironori Okuda\\', 'Anawat Rittirong\\', 'Toshiki Sakai\\', 'Akitoshi Sakaue\\', 'Kohtaku Suzuki\\', 'Yukichi Takihira\\', 'Yoichi Tamagawa\\', 'Shigeki Tokita\\', 'Masashi Tozawa\\', 'Masahiro Uemukai\\', 'Sei Yoshida\\', 'Atsushi Yoshioka\\', 'Ren Yuhaku\\'
Publikováno v:
Proceedings of 41st International Conference on High Energy physics — PoS(ICHEP2022).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8101e08f4085b857b45d26577ee34dcf
https://doi.org/10.22323/1.414.1142
https://doi.org/10.22323/1.414.1142
Autor:
Tomoaki Nambu, Taketo Yano, Soshi Umeda, Naoki Yokoyama, Hiroto Honda, Yasunori Tanaka, Yutaka Maegaki, Yusuke Mori, Masashi Yoshimura, Shuhei Kobayashi, Shuhei Ichikawa, Yasufumi Fujiwara, Ryota Ishii, Yoichi Kawakami, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama
Publikováno v:
Optics express. 30(11)
A unique design of our ultracompact microcavity wavelength conversion device exploits the simple principle that the wavelength conversion efficiency is proportional to the square of the electric field amplitude of enhanced pump light in the microcavi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b6ea802af33ae932483ac92784a31ff
https://pubmed.ncbi.nlm.nih.gov/36221660
https://pubmed.ncbi.nlm.nih.gov/36221660
Autor:
Tomoka Nishikawa, Ken Goto, Hisashi Murakami, Yoshinao Kumagai, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama
Publikováno v:
Japanese Journal of Applied Physics. 62:SF1015
β-Ga2O3 substrates and homoepitaxial films were characterized using the multiphoton excitation photoluminescence (MPPL) method. MPPL emission peaks at 3.2 and 3.36 eV were obtained with broad shoulders on the low energy side. MPPL images showed the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::df5a11243bcb19bbbeb70a69b0cf215e
https://doi.org/10.35848/1347-4065/acc18e
https://doi.org/10.35848/1347-4065/acc18e
Autor:
Tomotaka Murata, Kazuhisa Ikeda, Jun Yamasaki, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama
Publikováno v:
physica status solidi (b). :2200583
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4e50df0747d3d2116a78a86991cf67de
https://doi.org/10.1002/pssb.202200583
https://doi.org/10.1002/pssb.202200583
Autor:
Naoki Yokoyama, Yoshiki Morioka, Tomotaka Murata, Hiroto Honda, Kazunori Serita, Hironaru Murakami, Masayoshi Tonouchi, Shigeki Tokita, Shuhei Ichikawa, Yasufumi Fujiwara, Toshiki Hikosaka, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama
Publikováno v:
Applied Physics Express. 15:112002
A wavelength conversion device with an input grating coupler that enables easy alignment was fabricated using a vertically polarity inverted GaN layer. The device was excited with a femtosecond laser, and a second harmonic wave with a peak wavelength
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f13c98461536aa25fca63cf82de0daad
https://doi.org/10.35848/1882-0786/ac9511
https://doi.org/10.35848/1882-0786/ac9511
Autor:
Ryosuke Noro, Masahide Okazaki, Ikuo Mizobata, Masahiro Uemukai, Tomoyuki Tanikawa, Ryuji Katayama
Publikováno v:
Japanese Journal of Applied Physics. 61:072006
Watt-class wavelength conversion is expected by enlarging the mode size of the channel waveguides to dozens of micrometers to avoid optical damage with high-power pump lasers. In this work, uniform periodically-poled (PP) structures in MgO doped stoi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15002c9a4a6271f7f0cd4db5bfaada56
https://doi.org/10.35848/1347-4065/ac7837
https://doi.org/10.35848/1347-4065/ac7837