DE-R 389 Diffractive Optical Element
- Element Number: DE-R 389
- Current Product Revision: A
- Description: Matrix 21 x 21 Dots
- Number of Dots: 441 Dots
- Substrate Material: Polycarbonate (PC)
- Size (Ø x Thickness): 8 x 0.63 mm
- Design Wavelengths: 520 nm
- Recommended Wavelength Range: 480-600 nm
- Minimum Recommended Beam Diameter: 2-3 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 zeroth order has a similar power than the off-axis beams of the dot matrix.
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
405 nm
36.1 mm
25.5 mm
1.3 mm
25.5 mm
20.5°
14.5°
0.7°
14.5°
450 nm
40.3 mm
28.5 mm
1.4 mm
28.5 mm
22.8°
16.2°
0.8°
16.2°
515 nm
46.8 mm
33.1 mm
1.7 mm
33.1 mm
26.4°
18.8°
0.9°
18.8°
532 nm
48.0 mm
33.9 mm
1.7 mm
33.9 mm
27.0°
19.3°
1.0°
19.3°
594 nm
54.0 mm
38.2 mm
1.9 mm
38.2 mm
30.2°
21.6°
1.1°
21.6°
640 nm
58.5 mm
41.4 mm
2.1 mm
41.4 mm
32.6°
23.4°
1.2°
23.4°
684 nm
62.9 mm
44.5 mm
2.2 mm
44.5 mm
34.9°
25.1°
1.3°
25.1°
750 nm
69.6 mm
49.2 mm
2.5 mm
49.2 mm
38.4°
27.7°
1.4°
27.7°
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
402 nm
26.0%
447 nm
9.7%
515 nm
0.3%
531 nm
0.1%
640 nm
7.0%
658 nm
8.9%
684 nm
11.8%
749 nm
19.3%
描述 [描述] Design Wavelengths: 520 nm