Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Itaru Yokohama"'
Autor:
Masaya Notomi, Koji Yamada, Takahashi Junichi, Itaru Yokohama, Akihiko Shinya, Chiharu Takahashi
Publikováno v:
IEEE Journal of Quantum Electronics. 38:736-742
We experimentally demonstrate the structural tuning of the waveguiding modes of line defects in photonic crystal (PC) slabs. By tuning the defect widths, we realized efficient single-mode waveguides that operate within photonic band gap frequencies i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b26b16dbe11d16bb26f74061576fda4c
https://doi.org/10.1109/jqe.2002.1017583
https://doi.org/10.1109/jqe.2002.1017583
Autor:
Akihiko Shinya, Masaya Notomi, Chiharu Takahashi, Jun-ichi Takahashi, Itaru Yokohama, Toshiaki Tamamura
Publikováno v:
Optical and Quantum Electronics. 34:113-121
Two-dimensional photonic crystals (2D-PhCs) on oxide can be easily incorporated into photonic integrated circuits. Although an asymmetrical structure (air/PhC/oxide) is advantageous in terms of ease of fabrication, it has been pointed out that such a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38ab1bebdde9ba15d93dc7b3133d33a1
https://doi.org/10.1023/a:1013396524703
https://doi.org/10.1023/a:1013396524703
Autor:
Eiichi Kuramochi, Akihiko Shinya, Shojiro Kawakami, Jun-ichi Takahashi, Takayuki Kawashima, Koji Yamada, Itaru Yokohama, Masaya Notomi, Chiharu Takahashi
Publikováno v:
The Review of Laser Engineering. 30:65-69
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::66278c3e176df93a45ac5d2f34baec29
https://doi.org/10.2184/lsj.30.65
https://doi.org/10.2184/lsj.30.65
Publikováno v:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals. 316:7-14
We have devised an indirect laser-heated pedestal growth method to obtain organic nonlinear optical (NLO) devices with high wavelength conversion efficiency through the second-order NLO effect of materials. Using the method, the growth direction of o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3fd65c136801282a2cde4b8c6ab9715
https://doi.org/10.1080/10587259808044448
https://doi.org/10.1080/10587259808044448
Publikováno v:
Journal of Crystal Growth. 183:614-621
Laser heated pedestal growth method was used to grow Cr, Ca : Y 3 Al 5 O 12 (YAG) laser crystals. In order to dope both Cr and Ca ions, an undoped YAG rod on which both CaO and Cr 2 O 3 were deposited was used as source material. Incorporation of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::784b74c5cb4cc52b52646683eb77a461
https://doi.org/10.1016/s0022-0248(97)00482-x
https://doi.org/10.1016/s0022-0248(97)00482-x
Autor:
Yoshito Shuto, Michiyuki Amano, Toshio Watanabe, Itaru Yokohama, Makoto Hikita, Satoru Tomaru
Publikováno v:
IEEE Journal of Quantum Electronics. 33:349-357
First-order quasi-phase-matched (QPM) second-harmonic generation (SHG) is demonstrated in a poled diazo-dye-substituted polymer channel waveguide. The channel waveguide with a nonlinear grating was fabricated by the serial grafting technique using co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b8d9175c2f76188b57af991ecd842a25
https://doi.org/10.1109/3.556003
https://doi.org/10.1109/3.556003
Publikováno v:
Journal of Crystal Growth. 156:279-284
A novel crystal growth technique called indirect laser-heated pedestal growth (ILHPG) is proposed for growth of organic crystal. The main advantage of the ILHPG method is that a long rod-like organic crystal can be grown in any crystal direction. Thi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d447482bdceb2ad18fab84b8ce997488
https://doi.org/10.1016/0022-0248(95)00260-x
https://doi.org/10.1016/0022-0248(95)00260-x
Publikováno v:
Journal of Crystal Growth. 134:255-265
We introduced a novel afterheater which surrounds the optical focal components in the laser heated pedestal growth (LHPG) apparatus and enclosed the growth assemblies including the focal components in a chamber, in order to control both the temperatu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c8300d0cb5f0129420deb875300964e
https://doi.org/10.1016/0022-0248(93)90134-i
https://doi.org/10.1016/0022-0248(93)90134-i
Autor:
Itaru Yokohama
Publikováno v:
Applied optics. 28(19)
To achieve low excess loss fiber couplers, analysis on mode coupling behavior in fused fiber couplers has been carried out using a combination of a scalar wave finite element method and a step approximation method, with an emphasis on clarifying the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fa8297ef843dbee20dacc82164d57799
https://pubmed.ncbi.nlm.nih.gov/20555850
https://pubmed.ncbi.nlm.nih.gov/20555850
Publikováno v:
Applied optics. 27(23)
Loss characteristics and field intensity distributions of fused polarization-maintaining fiber couplers are measured. From the results, it is shown that excess loss spectra have a sinusoidal response. Further, the loss peaks of the usual polarization
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb1e36e558da420c5c30d796c8bfe77f
https://pubmed.ncbi.nlm.nih.gov/20539658
https://pubmed.ncbi.nlm.nih.gov/20539658