The laboratory follows the tradition of the Department of Quantum light generators of the ISI. The first gas laser in Czechoslovakia was put into operation and commercially successful ineterferometric systems were developed here. At present the group deals predominantly with stabilized lasers for etalons of optical frequencies, interferometric techniques with high resolution and direct methods of measurement of index of refraction of air. Traditional links of the group are to the Technical University of Brno, especially to the faculties of electrical and mechanical engieering and to institutes of metrology in the Czech Republic and abroad.