Lumentum Holdings Inc. (NasdaqGS:LITE) is in advanced talks to buy laser maker Coherent, Inc. (NasdaqGS:COHR)., according to people familiar with the matter, in a deal that would combine two companies whose products are used in everything from laser eye surgery to semiconductor manufacturing. A cash-and-stock deal could come together as soon as this week, assuming the talks don't fall apart, the people said. Exact terms couldn't be learned.