DE-R 262 Diffractive Optical Element
• Element Number: DE-R 262
• Current Product Revision: A
• Description: Viewfinder (Dot Square)
• Number of Dots: 37 Dots
• Substrate material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design wavelengths: 532 nm
• Recommended wavelength range: 480-670 nm
• Minimum recommended beam diameter: 0.5-1 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. Within the recommended wavelength range, the element shows the lowest intensity in the central spot. Outside the recommended wavelength range the pattern will be distorted. 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
c
d
α
β
γ
δ
450 nm
14.7 mm
10.4 mm
0.45 mm
10.4 mm
8.4°
6.0°
0.26°
6.0°
515 nm
16.9 mm
11.9 mm
0.51 mm
11.9 mm
9.6°
6.8°
0.29°
6.8°
532 nm
17.4 mm
12.3 mm
0.53 mm
12.3 mm
10.0°
7.0°
0.30°
7.0°
635 nm
21 mm
14.7 mm
0.63 mm
14.7 mm
11.9°
8.4°
0.36°
8.4°
650 nm
21 mm
15.1 mm
0.65 mm
15.1 mm
12.2°
8.6°
0.37°
8.6°
730 nm
24 mm
16.9 mm
0.72 mm
16.9 mm
13.7°
9.7°
0.41°
9.7°
780 nm
26 mm
18.1 mm
0.77 mm
18.1 mm
14.6°
10.3°
0.44°
10.3°
808 nm
27 mm
18.7 mm
0.80 mm
18.7 mm
15.2°
10.7°
0.46°
10.7°
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
12.1%
488
4.1%
520
3.0%
594
2.2%
638
5.7%
654
7.1%
669
6.8%
687
11.4%
描述 [描述] Design wavelengths: 532 nm