The invention relates to an optical generator for providing different combustion modes during combusting different fuels in different combustion chambers. The optical generator is characterized in that an elongated cylinder (302), an elongated cylinder sleeve (303), an elongated piston (203) and a circular gasket (101) are additionally mounted between an original cylinder (305) and a cylinder cover (301), a valve timing mechanism (308) is assembled on the cylinder cover (301), a circular aluminum alloy briquetting (201) and a transparent combustion chamber window (202) are mounted at the upper part of the elongated piston (203), a reflector (304) at 45 degrees with the axis of the piston is obliquely arranged at the lower part of the elongated piston (203), an angle scaler (5) is arrangedon a generator crankshaft (307), an air cylinder pressure quartz sensor (7) is assembled on the cylinder cover (301), and a valve lift-range inductor sensor (9) is mounted on the valve timing mechanism (308).