2021-12-01 OPD2021 – Optics and Photonics Days OPD2021 – Optics and Photonics Days 1 December, 2021 - 3 December, 2021 OPD2021 – Optics and Photonics Days Optics & Photonics Days is an annual central event in the area of Optics and Photonics in Finland. […]