 Shares of Coherent Inc. rose 1.5 in premarket trading Friday, after the laser technology company said it informed Lumentum Holdings Inc. that a revised unsolicited buyout bid from II-VI Inc. it received Thursday was superior to the recently increased and agreed on bid from Lumentum. Coherent said II-VIs bid was 195 in cash and 1.0 II-VI shares for each Coherent share Based on Thursdays closing prices, that represents a 271.51 price for Coherent shares, a 9.4 premium, that values Coherent at about 6.64 billion. 