Topic: Polarization Switching in Semiconductor Lasers. New Approach
Lecturer：Leonid I. Burov.（Belarus State university）
Time：14:00 pm, December 3th, 2018
Location: Room 322, East wing of main building
Polarization switching (PS) – sharp change of an initial linear output polarization on the orthogonal one under small changes of working parameters (current, temperature, stress). This effect in VCSELs (vertical cavity surface emitting lasers) attracts a lot of attention during more than 25 years and up to now there is no clear explanation of the whole amount of experimental data.
The report is devoted to the short description of new approach, based on a very simple idea of lasing – partially polarized or nonpolarized spontaneous radiation amplifies step by step inside a laser cavity with polarize anisotropic gain and/or loss. As a result, PS is a determined transition from one polarization state to another through a set of intermediate partially polarized states. This approach provides the possibility to get a very simple physical interpretation of PS as a physical phenomenon and to explain some data that have no explanation before.
The new approach provides to make a new sight to the problem of polarization bistability and multystability in general
Brief Introduction of Lecturer:
Docent (academic rank) 1983 BSU
Ph.D. (Physics and Mathematics major) 1977 BSU
Specialist (Master) degree (Physics major) 1970 BSU
Research fields: laser physics and technique, nonlinear optics and spectroscopy, devices and facilities for the laboratory of high learning education;
- More than 160 published works;
- Scientific leader of research group;
- Scientific Manager of Student Research Laboratory;
- Scientific Manager of 5 PhD Post-graduate students who have successfully defended their PhD dissertations.
Honors and Awards (the most remarkable from 2010):
1. The First Prize of the Belarusian Special Presidential Foundation for Social Support of the Talented Pupils and Students (2010);
2. The Honorable Sign of the Ministry of Education " Excellence in Education" (2016)