Morozov Yuri A. RussiaSaratovSaratov Branch of Kotel’nikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, 38, Zelenaya Str., Saratov 410019, Russiayuri.mor@rambler.ru Author's articles Difference-Frequency Generator and Optical Parametric Oscillator Pumped by a Semiconductor Disk Laser: Comparative Study with a Time Delay Model