Abstract: A wavelength converter system capable of replacing a nonlinear crystal in a wavelength converter in a short time with ease is provided. The wavelength converter system includes the wavelength converter for converting a wavelength by passing light through the nonlinear crystal and a crystal storage apparatus for storing a nonlinear crystal for replacement used by the wavelength converter, wherein the wavelength converter has a first crystal holder for fixing the nonlinear crystal and a first heater for heating the nonlinear crystal and the crystal storage apparatus has a container, a second crystal holder that is in the container to fix the nonlinear crystal for replacement and interchangeable with the first crystal holder, and a second heater for heating the nonlinear crystal for replacement.

Abstract: A vending machine which measures the weights of a retaining vessel, having commodities, so as to determine the difference in weight before and after the removal of commodities as an electrical signal. An in-line system includes a locking access door for taking out commodities from the machine by inserting a lock-releasing medium into the automatic vending machine. An off-line system includes a system for storing nomenclature, quantity, price and the like of commodities to be purchased by inserting a storing medium into the automatic vending machine.