Zobrazeno 1 - 10
of 122
pro vyhledávání: '"Heikki Virtanen"'
Publikováno v:
IEEE Photonics Journal, Vol 16, Iss 4, Pp 1-9 (2024)
The use of vertical-cavity-surface-emitting lasers with ability to operate at cryogenic temperatures (Cryo-VCSELs) is a promising path to implement optical data links between superconducting processors maintained in cryogenic environments (4 K range)
Externí odkaz:
https://doaj.org/article/322f34ebd4cf4162b285df87e60ab605
Publikováno v:
IEEE Photonics Journal, Vol 15, Iss 5, Pp 1-10 (2023)
Current development trends concerning miniaturizing of electronics and photonics systems are aiming at assembly and 3D co-integration of a broad range of technologies including MEMS, microfluidics, wafer level optics, multilayered structures with thr
Externí odkaz:
https://doaj.org/article/d706ab263b9a4610950dffd7f4e95bc6
Publikováno v:
Cellular and Molecular Gastroenterology and Hepatology, Vol 14, Iss 1, Pp 27-34 (2022)
Background & Aims: The enteric nervous system (ENS) is the largest part of the peripheral nervous system; moreover, abnormal ENS development and function are associated with multiple human pathologies. Data from several groups suggest that under norm
Externí odkaz:
https://doaj.org/article/cf2eed0ccc3d4a9582c4f5d95d4c94af
Publikováno v:
Cellular and molecular gastroenterology and hepatology. 14(4)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ed4905c41c10f69ee9b9686502d1f8f
https://pubmed.ncbi.nlm.nih.gov/35940207
https://pubmed.ncbi.nlm.nih.gov/35940207
Autor:
Topi Uusitalo, Jukka Viheriälä, Heikki Virtanen, Santeri Hanhinen, Roosa Hytönen, Jari Lyytikäinen, Mircea Guina
High peak power and brightness eye-safe lasers are desired in automotive LIDAR, for example. We address this need by developing tapered ridge waveguide lasers with highly asymmetric InGaAsP/InP epilayer emitting at around 1.5 μm wavelength. The stru
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1c0a936ca2a20deaf532d89e984eefe7
https://trepo.tuni.fi/handle/10024/141419
https://trepo.tuni.fi/handle/10024/141419
Autor:
Topi Uusitalo, Heikki Virtanen, Jukka Viheriälä, Jarno Reuna, Antti T. Aho, Mircea Guina, Mervi Koskinen
Publikováno v:
High-Power Diode Laser Technology XVIII.
We report on the development of high peak-power laser diodes emitting in the 1.5 µm wavelength band. Two design approaches, broad-area laser diodes and tapered laser diodes, are described, both with integrated wavelength locking using distributed Br
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::23e11f6a60982ece47e94269b1f646f7
https://doi.org/10.1117/12.2542095
https://doi.org/10.1117/12.2542095
Autor:
Riku-Heikki Virtanen
Publikováno v:
Baltic Journal of Law & Politics, Vol 11, Iss 1, Pp 158-186 (2018)
The Convention on the Rights of Persons with Disabilities (UN CRPD) stipulates an obligation for states to consult persons with disabilities in the development and implementation of legislation and policies with respect of implementing this Conventio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e1564496581172ec99c981dc1208332
https://doi.org/10.2478/bjlp-2018-0007
https://doi.org/10.2478/bjlp-2018-0007
Autor:
Maija Karjalainen, Heikki Virtanen, Sanna Ranta, Topi Uusitalo, Jukka Viheriälä, Mihail Dumitrescu
Publikováno v:
IEEE Photonics Technology Letters. 30:51-54
This letter presents narrow-linewidth 780-nm edge-emitting semiconductor DFB lasers fabricated without re-growth using UV-nanoimprinted surface gratings. The third-order laterally coupled ridge-waveguide surface gratings enable single mode operation,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8b169f2ebc28219999e527ceeb278a07
https://doi.org/10.1109/lpt.2017.2772337
https://doi.org/10.1109/lpt.2017.2772337
Autor:
Arttu Raja-Halli, Heikki Virtanen
Publikováno v:
Pure and Applied Geophysics. 175:1669-1681
The new dual-sphere superconducting gravimeter (SG) OSG-073 was installed at Metsahovi Geodetic Fundamental Station in Southern Finland in February 2014. Its two gravity sensors (N6 and N7) are side by side, not one on top of the other as in other ea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9cf243e643ececbe9433230e883ea66c
https://doi.org/10.1007/s00024-017-1719-3
https://doi.org/10.1007/s00024-017-1719-3