Jason Lee was appointed director of technology partnerships at Elgar Electronics Corp., a San Diego, Calif., manufacturer of programmable AC and DC power supplies. Lee has more than 17 years of product marketing and engineering experience working for companies such as KLA-Tencor, Applied Materials and NCR.   . . .   Madison, Wisc.-based high-power diode manufacturer Alfalight Inc. has appointed sales partners in Europe, Israel and Japan to expand the support of its high-power diode lasers in those regions. The new partners include Laser 2000 GmbH in Germany, Austria and Switzerland; Laser 2000 AB in Denmark, Finland, Sweden and Norway; AlfaPhotonics in France and Italy; Lahat Technologies in Israel; and Indeco Inc. in Japan.   . . .    Robert Winkler was named system sales engineer at Janos Technology Inc., a Townshend, Vt., maker of infrared optical components and assemblies. Winkler was previously a business development specialist and account manager for aerospace and defense customers at Corning's Diamond Turning Division in Keene, N.H. He has also worked with Lockheed Martin's Infrared Imaging Systems, Raytheon Company's Missile Systems Laboratories and Kollmorgen Corp.'s Electro-optics Division.