Sharma was found dead in the institute on March 15.
"Request for CBI probe has been sent yesterday," Arun Kumar Mishra, Secretary (Home) told reporters here.
Police have filed a charge sheet against two persons, Uday Swaroop (21), a BSc student of the institute, and his friend, 35-year-old Yashveer Singh Sandhu, a laboratory technician. They were arrested on April 24.
The body of 27-year-old Neha was found in laboratory with 12 deep cuts inflected with a paper cutter and a surgical blade.
