The second International Conference on Trends in Quantum Electron ics (TQE'85) was held in Bucharest at the National Centre for Physics in September 1985, and brought together more than 350 scientists from 22 countries. In accordance with the objectives established at the first conference, which was held in 1982 in conjunction with the third International Summer School in Coherent Optics, the second conference con centrated upon the central topics and chief directions of development in quantum electronics - which stands out as an area of science and technology that is currently expanding vigorously. On the other hand, it was also apparent that TQE'85 was primarily influenced by the worldwide celebration, in 1985, of the 25th anniversary of the laser - a moment of prime importance in the development of many frontline fields, including communications, chemistry, biology, health care and materials processing. A special session was devoted to this anniversary. In keeping with the dynamic spirit of the conference, the fine quality of the invited lectures and the other contributions set a high scientific standard for the proceedings. Mention should be made of the posters that were presented throughout the conference. These, together with the exhibition of books and journals and a display of specialized scientific equipment, did much to create a framework for effective communication and stimulating interaction, to the benefit of all the participants. Of invaluable help in the preparation of the conference was the collaboration of the International Scientific Advisory Committee.