AXT (AXTI) shares surged more than 17% on Monday after the company disclosed it signed a three-year supply deal with Coherent (COHR). AXT's subsidiary, known as AXT-Tongmei, will develop and supply 6-inch indium phosphide water substrates to Coherent. Coherent is making a prepayment of about $22.29M for the deal, and AXT will expand production capa...