DE-R 236 Diffractive Optical Element
• Element Number: DE-R 236
• Current Product Revision: A
• Description: Viewfinder (Square)
• Substrate material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design wavelengths: 633 nm
• Recommended wavelength range: 530-650 nm
• Minimum recommended beam diameter: 2-3 mm
Within the recommended wavelength range, the zeroth order central spot is not visible on the line. This Largeangle pattern is subject to geometrical distortion due to its symmetry properties, if the DOE is used at laser wavelengths significantly different (∆λ > 50nm) from the design wavelength. 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.
Geometry and Diffraction Angles
Wavelength
Pattern Size @ 100 mm Distance
Pattern Angles
a
b
α
β
450 nm
58 mm
42 mm
32°
24°
515 nm
67 mm
48 mm
37°
27°
532 nm
70 mm
50 mm
38°
28°
635 nm
85 mm
60 mm
46°
34°
650 nm
88 mm
62 mm
47°
35°
730 nm
101 mm
71 mm
54°
39°
780 nm
110 mm
79 mm
58°
42°
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
20 %
515
4.6 %
532
2.7 %
594
0.11 %
638
1.5 %
654
2.3 %
687
4.8 %
751
11 %
801
15 %
描述 [描述] Design wavelengths: 633 nm