T-1500-930-28x18-94 Laser Accessories High Efficiency Transmission Grating: Center Wavelength 930 nm, Groove Density 1500.38 lines/mm, Angle of Incidence 44.2 deg, Diffraction efficiency 94% min, Polarization S and P. Size =28 x 18 x 0.95 mm (groove length 18 mm), Clear aperture =27 x 17
