HORIBA
MKS Instruments(Newport Corporation)
Edmund Optics
Shimadzu Corporation
Kaiser Optical Systems
Lightsmyth (Finisar)
Plymouth Grating Lab
Zeiss
Optometrics (Dynasil)
Headwall Photonics
Spectrogon AB
Jenoptik
Spectrum Scientific
Photop Technologies
Wasatch Photonics
GratingWorks
Shenyang Yibeite Optics