DE-R 270 Diffractive Optical Element
• Element Number: DE-R 270
• Current Product Revision: A
• Description: Cross – 30 @ 640
• Number of Spots on Line: 1101
• Substrate Material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design Wavelengths: 640 nm
• Recommended Wavelength Range: 590-660 nm
• Minimum Recommended Beam Diameter:2-3 mm
Within the recommended wavelength range, the zeroth order is not brighter than the rest of the cross. Pattern size and pattern angles and the intensity in the undiffracted central spot ('zero order intensity', see reverse page) will vary most with the wavelength. Diffraction efficiencies given on this datasheet have been measured using elements of product revision A.
Pattern Geometry and Diffraction Angles
Wavelength
Patttern Size @ 100 mm Distance
Pattern Angle
a
α
450 nm
37 mm
18.9°
515 nm
43 mm
24°
532 nm
44 mm
25°
635 nm
53 mm
30°
650 nm
54 mm
30°
730 nm
62 mm
34°
780 nm
66 mm
37°
808 nm
69 mm
38°
Setup
Laser diodes are the most common light source to be used with diffractive optical elements, but other laser light sources may also be used. The DOEs are best used with collimated or convergent laser sources. The microstructure surface should be oriented towards the laser. The 0-order spot is equivalent in size and shape to the original beam, but its power is attenuated.
Diffraction Zero Order Intensity:
Wavelength
0-Order Intensity
448
34%
515
10.9%
532
7.5%
594
0.9%
638
0.5%
654
0.9%
687
2.6%
751
7.7%
描述 [描述] Design Wavelengths: 640 nm