VOLUME PHASE HOLOGRAPHIC TRANSMISSION GRATINGS 600 l/mm at 1550 nm These high-efficiency gratings work well in the C-band NIR spectrum around 1550 nm. They are created by using coherent laser light and recording the interference pattern in dichromated gelatin. After processing, the grating is capped with a protective glass cover and then AR coated. The resulting grating has low scatter, high diffraction efficiency, and low wavefront distortion. The grating is durable and can be cleaned by the same methods used to clean other AR coated optics. These gratings are available in 25 mm and 50 mm diameter un-mounted or mounted in a black anodized aluminum ring. SPECIFICATIONS 1 inch gratings Substrate and Cover Glass Wavefront Spatial Frequency Clear Aperture Mounting Ring AR Coating 2 inch gratings 1 mm water white 2 mm total thickness < λ/5 rms @ 632.8 nm 600 lpmm +/- 0.5 lpmm 20.4 mm 25.4 mm x 2.5 mm < 0.5% Reflection 1400nm-1700nm Transmission Grating Geometry 1400 1500 1600 Wavelength (nm) AR Coating 3 mm B270 6 mm total thickness < λ/5 rms @ 632.8 nm 600 lpmm +/- 0.5 lpmm 42.8 mm 50.8 mm x 6.6 mm < 0.5% Reflection 1400nm-1700nm Short Wavelength Light Center Wavelength Light Long Wavelength Light Incident Light Es Ep Eavg Dispersion of Grating 600 lpmm CWL = 1550 nm 35 Angle of diffraction (deg.) Efficiency versus Wavelength 600 lpmm 1500 nm 1.00 0.80 0.60 0.40 0.20 0.00 Substrate and Cover Glass Wavefront Spatial Frequency Clear Aperture Mounting Ring 30 25 20 1700 1400 1500 1600 Wavelength (nm) 1700
© Copyright 2024 ExpyDoc
