Under the leadership of Professor Sazdo Ivanov an agreement has signed for establishment of the International Laboratory of Strong magnetic fields and low temperatures in Wroclaw, Poland since 1968. Environmental Physics Laboratory Laboratory of Environmental Physics has modest and actual new subject of research. Liquid Crystals Laboratory Laboratory of liquid crystals is created by Professor D.Sc. Alexander Derzhanski, member of BAS since 1968. Biomolecular Layers Laboratory Laboratory of Biomolecular Layers exists under the guidance of Alexander G. Petrov since 1991. Optics and Spectroscopy The beginning of the Laboratory of optics and spectroscopy is placed by Professor Paraskeva Simova in the Physics Institute of the Bulgarian Academy of Sciences since 1951. Atomic Spectroscopy Laboratory Laboratory of Atomic Spectroscopy was established under the leadership of Professor Yordanka Pacheva in the early 1960s. Metal Vapour Lasers Laboratory Laboratory of metal vapor lasers was established at the Institute for Solid State Physics, Bulgarian Academy of Sciences in 1987. Studies of metal vapor lasers began in 1970 with the creation of the first helium-cadmium laser. Next stage in the laboratory was placed on the creation of the first pulse laser with copper vapour in 1972. Remarkable development was made in 1974 by placing first in the world copper bromide laser, which is low-temperature version of the copper vapor laser. The laser is a Bulgarian invention that has many applications in the practical world. References External links Bulgarian Academy of Sciences Institute of Solid State Physics Museum Institutes of the Bulgarian Academy of Sciences