Patent ID: 8787413

Claim:
A temperature controller for a gas laser which controls temperatures of a plurality of temperature-controlled apparatuses including first temperature-controlled portions each of which requires a high-precision temperature-control and second temperature-controlled portions each of which requires a low-precision temperature-control as compared with the first temperature-controlled portions and allowing a temperature-control with a low or high temperature as compared with the first temperature-controlled portions, the temperature controller for a gas laser comprising: a first piping system configured to connect the first temperature-controlled portions in parallel with each other; a second piping system configured to connect the second temperature-controlled portions in parallel with each other; and a temperature control portion located on the first piping system and configured to cool or heat an existing cooling water provided from an upstream cooling system for adjusting a temperature of the first temperature-controlled portions, the temperature-controlled existing cooling water cooled or heated by the temperature control portion flowing through each first temperature-controlled portion by passing through the first piping system, and the existing cooling water provided from the upstream cooling system being directly provided to the second piping system.