Dear colleagues, dear guests from foreign lands, from all over Russia, from Novosibirsk! Let me express my warmest greetings to you on behalf of the Organizing and Program Committees of the Conference. Vavilov Conferences were set up by Academician R. V. Khokhlov in 1969 and over the previous 10 Conferences some traditions have been started and established which have won recognition and respect of the world scientific community. Each Conference was devoted to a limited set of four or five topical problems. At the same time, the treated subjects changed drastically from Conference to Conference and the previous 10 Conferences had covered practically all aspects of the wonderfully variable world of non-linear optics from parity violation in spectroscopy to the optical informational technologies. Summarizing discussions were held on the newly emerging trends and fields. The reports were mostly surveys and had been "ordered" by the Program Committee. The site and time of the Conference have been traditional, i.e. the second half of June, Novosibirsk research center (Akademgorodok). The Organizing and Program Committees of the present Conference were, naturally, willing to maintain these traditions.