We are very pleased to invite you to this year's VCSEL Day, which will take place in Łódź on 19 September 2025. As always, we hope it will be an opportunity to present the latest findings, exchange ideas and experiences.

This year we are planning a one-day meeting to be held at the Institute of Physics at the Lodz University of Technology.

Additionally, we would like to let you know that the NUSOD conference will also be held in Łódź from 14 to 19 September. So those of you who are interested in numerical computing can combine participation in these two conferences.

The VCSEL Day is an annual meeting of scientists and researchers from across Europe and beyond working with vertical-cavity surface-emitting lasers (VCSELs). The conference is attended by representatives from leading research institutions and universities and companies involved in VCSELs implementations.

The conference will cover a range of topics from theoretical foundations to the most exciting applications of VCSELs. In particular, we will focus on:

• properties of VCSELs and their experimental characterisation and numerical computations

• new designs of VCSELs including blue and mid-infrared emitting lasers

• new technologies and approches in the fabrication of VCSELs

• use of VCSELs in various areas including communications and neuromorphic optical networks

See you soon in Łódź!