Browsing USN Open Archive by Author "Fordell, Thomas"
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Bipolar photodiode module operated at 4 K
Bardalen, Eivind; Nissilä, Jaani; Fordell, Thomas; Karlsen, Bjørnar; Kieler, Oliver; Øhlckers, Per (Chapter, 2020)An optoelectronic module for generating high frequency bipolar current pulses at 4 K was developed. Bipolar signals are generated by connecting a pair of photodiodes in series to coplanar waveguides on silicon. The ... -
Driving a low critical current Josephson junction array with a mode-locked laser
Nissilä, J.; Fordell, Thomas; Kohopää, K.; Mykkänen, E.; Immonen, P.; Jabdaraghi, R. N.; Bardalen, Eivind; Kieler, Oliver; Karlsen, Bjørnar; Øhlckers, Per; Behr, Ralf; Manninen, A. J.; Govenius, J.; Kemppinen, A. (Peer reviewed; Journal article, 2021)We report proof-of-concept experiments on an optically driven Josephson voltage standard based on a mode-locked laser (MLL), a time-division multiplexer, and a cryogenic ultrafast photodiode driving an overdamped Josephson ... -
High-Speed Pulsation of a Cryogenically Operable Bipolar Photodiode Module for the Josephson Arbitrary Waveform Synthesizer
Karlsen, Bjørnar; Bardalen, Eivind; Nissilä, Jaani; Fordell, Thomas; Kieler, Oliver; Palafox, Luis; Behr, Ralf; Malmbekk, Helge; Akram, Muhammad Nadeem; Øhlckers, Per (Peer reviewed; Journal article, 2020)This paper describes the development and testing of a prototype of a cryogenically operable bipolar photodiode module. Optical pulsation systems based on both a Mach-Zehnder modulator and a mode-locked laser have been used ...