CLEO/Europe-EQEC 2017 Shodai Honda

2017-01-18 2022-09-24 miyahara

Research

CLEO/Europe-EQEC 2017 Participation Report

Master1Year: Shota Shota

Outline

CLEO/Europe-EQEC was held at the International Congress Center Munich (ICM) in Munich, Germany, from June 25 to 29. The conference was very lively, with beer, hamburgers and pretzels being served at the end of each day's presentations, and there was also a conference dinner. An exhibition called Laser World of Photonics was held at the same venue as the conference. The scale of the exhibition was very large, and the exhibiting companies were divided by field and by country, and there were quite a few exhibitors. There was also a contest in which each team had to make an electronic device (?) within a time limit. It looked like a fun event. I was surprised at the volume of meat and beer, but I was most surprised at how quickly the traffic lights change (considerably faster than in Japan; if I were walking, I would not make it in time...).

2. regarding his/her own presentation

I had a presentation at CLEO/Europe and a presentation at KEIO-TUM Joint Seminar held at Technical University of Munich. I was very nervous because I was the first presenter in the session "Brillouin lasers and scattering", but I felt that there were not many people in the audience because of the early morning time. Since the session was specialized on Brillouin lases, I was asked an important question about the temperature characteristics, whether the difference in the amount of Brillouin shift between two resonators at different temperatures would be a problem. Although I could not answer the question and answer well, it was a good opportunity to review my own research. I was also glad that he mentioned a little about Brillouin lasers with coupled resonators in his presentation immediately after his own. After listening to the session, I felt that the stage of confirming the operation of Brillouin lasers using micro optical resonators with various resonators and methods is over and we are now in the stage of stabilization and performance enhancement of Brillouin lasers and applications (slow light, etc.) using these lasers.

3. related announcements

Brillouin lasing in a hybrid silicon chip [cd-5-2].

A study presented by CUDOS, in which a Brillouin laser was experimentally demonstrated by fabricating an As2S3 ring resonator on a silicon chip. This research group has been working on SBS for a long time, and recently there is a study on SBS of nanowire on Si. The motivation of this research was to solve the problem of the Brillouin lasers of other micro optical resonators that use tapered fibers or prism couplings, which are not suitable for integration into chips or for mass production. The chalcogenide material was selected for SBS excitation because its Brillouin gain is about 20 times higher than that of silica. The As2S3 ring resonator was fabricated on an Si substrate and spiraled to 85 um × 4 mm square. The Q-value was reported to be about 4 × 105. Compared to other studies, the Q-value was low and the input power was large (about 80 mW) due to the low Q-value. However, because it can be fabricated on a silicon substrate, we felt that it has an advantage in optical coupling. This research will be published in Optica.

Phase-Variance reduction of high order Stokes lines in Brillouin fiber lasers [cd-5-5]Reduction of Brillouin scattering for the optimization of liquid-core Raman wavelength converters [cd-5-6].

Both of these presentations are about the Brillouin fiber laser. In the former, higher-order Stokes beams are generated in a cascade as the pump power is increased, and it was experimentally demonstrated that the higher-order Stokes beams have smaller phase noise. In the latter part of the presentation, the SRS and SBS were measured at different fiber lengths as the pump power was increased, and the optimal fiber length existed to suppress the SRS and SBS. Since the Brillouin laser in fibers is a field that has been studied for quite some time, I felt that neither of the two presentations had that much of an impact.