A coalition of venture capital groups has made a $2.5 million investment in Nufern, a fiber optic laser manufacturer based in East Granby. The investment includes a $151,000 investment by Connecticut Innovations, the state’s quasi-public tech investment group headquartered in Rocky Hill. Other partners in the venture financing round are Lightspeed Venture Partners, Lake Street Capital, Axiom Venture Partners, HRLD Venture Partners, Storm Ventures and and Jolimont Ventures. A second, larger equity financing round is expected later this year.