A an apparatus for locking a bending mechanism that bends a reflex type wavelength selection element for a bending mechanism that bends a reflex type wavelength selection element comprises a locking assembly. The locking assembly locks the bending mechanism. This allows maintaining the configuration of the reflex type wavelength selection element with the element being bent by the bending mechanism according to curvature of wavefront of an incident laser beam. Therefore, it is possible to stabilize the performance of wavelength selection in the reflex type wavelength selection element, even though the laser device receives vibration and shock.

 
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> Absolute wavelength calibration of lithography laser using multiple element or tandem see through hollow cathode lamp
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