Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Topi Uusitalo"'
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
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
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, and silicon photonics. To this e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f869db459fea1985f87020632aa3bef
https://trepo.tuni.fi/handle/10024/145671
https://trepo.tuni.fi/handle/10024/145671
Publikováno v:
2020 European Conference on Optical Communications (ECOC).
A double-section passive mode-locked GaSb-based laser emitting more than 10mW average power is presented. The device emits optical pulses at 18.76 GHz repetition rate and estimated pulse width of 1.3 ps. An optical spectrum as wide as 3.2 nm is recor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f64b313c4faac19dfc4321c7cb7b68c5
https://doi.org/10.1109/ecoc48923.2020.9333333
https://doi.org/10.1109/ecoc48923.2020.9333333
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:
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:
Ville-Markus Korpijärvi, Mervi Koskinen, Heikki Virtanen, Mihail Dumitrescu, Topi Uusitalo, Antti T. Aho, Jukka Viheriälä, Mircea Guina
Publikováno v:
IEEE Photonics Technology Letters. 29:114-117
We report narrow-linewidth 1180-nm GaInNAs/GaAs distributed Bragg reflector lasers reaching up to ~500-mW continuous-wave output power at room temperature. The lasers employ surface gratings, which avoided the problematic regrowth and enabled a high
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::584aa4897a736e873c3ec020ddb3f3aa
https://doi.org/10.1109/lpt.2016.2629512
https://doi.org/10.1109/lpt.2016.2629512
Autor:
Lauri Hallman, Juha Kostamovaara, Jukka Viheriälä, Antti T. Aho, Mircea Guina, Eugene A. Avrutin, Boris S. Ryvkin, Jari Lyytikäinen, Topi Uusitalo
Publikováno v:
2019 IEEE High Power Diode Lasers and Systems Conference (HPD).
We report on the development of high peak power laser diodes emitting in the $1.5 mu mathrm m$ wavelength band for eye-safe LIDAR applications. Different techniques for wavelength locking to and operation with a narrow emission spectrum are discussed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9db1de97ad2822f2a48326e9bd3626d4
https://doi.org/10.1109/hpd48113.2019.8938669
https://doi.org/10.1109/hpd48113.2019.8938669
Publikováno v:
IEEE Photonics Technology Letters
Wavelength stabilization against temperature variation of high-power broad area 1.5 μm InGaAsP/InP laser diodes is demonstrated by employing surface gratings. The development targets application in eye-safe automotive LIDAR systems, which would bene
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::050fb59299d94cce2627e70dc0329ef5