Revenue guidance for current quarter cut by $70M on sudden drop in demand for laser diodes used in 3D sensing applications.

But II-VI stock falls by one-fifth as market questions price of deal valuing Finisar at substantial premium.

Optical networking equipment and photonic integrated circuit manufacturer sheds one-third of its market valuation as investors take fright.

Trade war takes the edge off record-breaking fiscal year, with a 10% dip in sales now pencilled in for 2019.

Fiber laser firm reports 'aggressive' price competition in China; says will move beyond 10 kW in 2019.

Stock leaps 20% as company reports negligible impact from China tariffs, broad-based demand for its photonic components and sub-systems, and an acquisition related to laser weapons development.

Stemmer's record annual revenue up 14% to over €100 million; Cognex has second-best quarter but warns China market is cooling.

Laser micromachining systems firm seen as highly complementary addition to MKS' existing photonics portfolio, including Spectra-Physics laser division.

Fiber laser firm sees opportunities to cement market-leading position amid current market downturn.

Silicon Valley-based Innovusion wins Chinese venture backing to target market for autonomous vehicles with laser sensors.

Spectra-Physics performing well amid generally weaker trading outlook.

Transaction for medical imaging technology assets is expected to be completed by the end of 2018.