DE-R 239 Diffractive Optical Element
• Element Number: DE-R 239
• Current Product Revision: A
• Description: Cross – 5 @520
• Number of Spots on Line: 217
• Substrate Material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design Wavelengths: 520 nm
• Recommended Wavelength Range: 488-600 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
405 nm
6.8 mm
3.9 °
450 nm
7.5 mm
4.3 °
515 nm
8.6 mm
4.9 °
532 nm
8.9 mm
5.1 °
635 nm
10.6 mm
6.1 °
650 nm
10.8 mm
6.2 °
730 nm
12.2 mm
7.0 °
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
402
24 %
447
8.9 %
488
2.7 %
515
1.4 %
532
1.3 %
594
4.5 %
638
8.9 %
654
9.8 %
687
13%
描述 [描述] Design Wavelengths: 520 nm