 Shares of Coherent Inc. rallied 5.1 in premarket trading Thursday, after the laser technology company received yet another higher buyout bid from II-VI Inc. , which Coherent determined is superior to the agreed upon bid from Lumentum Holdings Inc. . Under terms of the new II-VI bid, Coherent shareholders would receive 220 in cash and 0.91 II-VI shares for each Coherent share they own. 