1. Centre for Plasma and Laser Engineering; The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences; 14 Fiszera St. 80-231 Gdansk Poland), Fax: (+48) 58-341-61-44
2. Department of Metrology and Optoelectronics; Faculty of Electronics, Telecommunications and Informatics; Gdansk University of Technology; 11/12 G. Narutowicza St. 80-233 Gdansk Poland