Patent ID: 7436872
Filing Date: 2008-10-14
Classification: H01S

Abstract:
1. A radio frequency (RF) discharge excited gas laser oscillator receiving power from a laser power supply controlled by a pulse command, the laser power supply having a DC power unit and a RF power unit positioned at a downstream side of said DC power unit, said RF discharge excited gas laser oscillator comprising: a power detecting section for detecting supply power supplied from said DC power unit to said RF power unit; and a pulse command control section positioned at an upstream side of said DC power unit, the pulse command control section comparing an upper limit value of supply power determined from a relationship between a discharge tube temperature and supply power and an actual supply power detected by said power detecting section, stopping the pulse command value to said discharge tube when said supply power is higher than said determined upper limit value, and setting a pulse command value based on said determined upper limit value.