Seventh Aluminizing of 2.34 M VBT Primary mirror
Seventh Aluminizing of 2.34M primary mirror of VBT was successfully completed during 4th to 6th of November this year. The complete operation requires an extraordinary technical skills and surgical operation kind of care. The Aluminizing is done using a 2.8 M Vacuum coating plant especially designed and built for this purpose. The monolithic primary mirror which was indigenously built at IIA has an optical surface close to λ/20 rms profile and micro roughness better than 25 A requires extraordinary care during complete Aluminizing process. This Primary mirror weighs 3.5 tons. Attached Pictures show different stages of the operation.