DE-R 221 Diffractive Optical Element
• Element Number: DE-R 221
• Current Product Revision: A
• Description: 1 : 72 Dot Circle
• Number of Dots: 72 + 1 Dots
• Substrate material: Polymethyl Methacrylate (PMMA)
• Size (Ø x Thickness): 8 x 1 mm
• Design wavelengths: 532 nm
• Recommended wavelength range: 400-570 nm
• Minimum recommended beam diameter: 1.5-2.0 mm
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. At the optimum wavelength given on this datasheet, the element shows the lowest intensity in the central spot.
Diffraction efficiencies given on this datasheet have been measured using elements of product revision A.
Geometry and Diffraction Angles
Wavelength
Pattern Size @ 100 mm Distance
Pattern Angles
a
b
α
β
450 nm
31 mm
1.4 mm
17.7°
0.78°
515 nm
36 mm
1.6 mm
20°
0.89°
532 nm
37 mm
1.6 mm
21°
0.92°
635 nm
44 mm
1.9 mm
25°
1.11°
650 nm
45 mm
2.0 mm
26°
1.14°
730 nm
51 mm
2.2 mm
29°
1.29°
780 nm
55 mm
2.4 mm
31°
1.38°
808 nm
57 mm
2.5 mm
32°
1.43°
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
450
9.4%
488
3.4%
520
1.0%
594
1.4%
638
4.8%
654
6.7%
669
8.2%
687
10.0%
描述 [描述] Design wavelengths: 532 nm