Patent ID: 7085302
Filing Date: 2006-08-01
Classification: H01S

Abstract:
1. A laser apparatus that emits a laser beam comprising: a discharge chamber adapted to receive a laser gas from a gas supply unit; at least two electrodes disposed in the discharge chamber and connected to a power supply unit for exciting the laser gas by applying a voltage to the at least two electrodes; a gas characteristic detecting unit that detects a characteristic of the laser gas in the discharge chamber; a calculation unit that calculates an oscillation wavelength and a wavelength spectral bandwidth of the laser beam based on a detected result by the gas characteristic detecting unit; and a control unit that monitors whether each of the oscillation wavelength and the wavelength spectral bandwidth of the laser beam is within a predetermined range and initiates an adjusting process when at least one of the oscillation wavelength and the wavelength spectral bandwidth of the laser beam is out of the predetermined range.