DE-R 240 Diffractive Optical Element
• Element Number: DE-R 240
• Current Product Revision: A
• Description: 1 : 16 Dot Circle
• Number of Dots: 16 + 1 Dots
• Substrate material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design wavelengths: 635 nm
• Recommended wavelength range: 530-700 nm
• Minimum recommended beam diameter: 0.5-1.0 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
488 nm
14.5 mm
2.9 mm
8.3°
1.63°
543 nm
16.2 mm
3.2 mm
9.2°
1.82°
594 nm
17.7 mm
3.5 mm
10.1°
1.99°
635 nm
18.9 mm
3.7 mm
10.8°
2.1°
650 nm
19.4 mm
3.8 mm
11.1°
2.2°
730 nm
22 mm
4.3 mm
12.4°
2.5°
780 nm
23 mm
4.6 mm
13.3°
2.6°
808 nm
24 mm
4.7 mm
13.8°
2.7°
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 (ZO) Intensity VS Off-Axis Intensity (OA):
Wavelength
0-Order Intensity
OA Intensity
488
11.8%
515
7.6%
594
0.2%
3.5%
638
0.6%
3.7%
654
1.3%
3.6%
669
1.9%
687
3.4%
3.6%
780
10.8%
描述 [描述] Design wavelengths: 635 nm