ALPS2019 Tsunaya Tanaka

A poster presentation was given on the changes in Q-values and dispersion of magnesium fluoride crystal resonators fabricated by precision machining before and after polishing. I had already experienced the presentation format at the Spring Meeting of Japan Society of Applied Physics, but I had a hard time because the presentation was given in English. I focused on conveying the contents of the presentation and the audience seemed to be able to understand most of my presentation. The most frequently asked question was "To what extent are you aiming to improve the Q-value toward solitonization? This made me keenly aware of the necessity of estimating specific numerical targets, rather than simply showing that Q-values have improved. Finally, one of the audience members advised us to apply chemical surface treatment using annealing or high-power lasers, since hand polishing alone may eventually reach its limits in terms of accuracy and reproducibility. In fact, there are previous studies that have improved the Q-value by several times by making full use of such techniques, and it would be important to consider more advanced processing methods in addition to hand polishing by referring to them. The audience included Dr. Kannari, Dr. Minoshima, Mr. Nakajima of the Minoshima Laboratory, and the award judges. In particular, the opportunity to have close discussions with Dr. Minoshima was a great source of food for us. In addition, thanks to the help of many people, we received the student award at this conference, which was a great motivation for the presenter in his future research activities.