DE-R 285 Diffractive Optical Element
• Element Number: DE-R 285
• Current Product Revision: A
• Description: Hexagon
• Substrate material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design wavelengths: 780 nm
• Recommended wavelength range: 520-800 nm
• Minimum recommended beam diameter: 0.5 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 either the lowest intensity in the central spot (between 600 and 700 nm) or an equal intensity to the off-axis spots (around 570 nm and 770 nm). 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
α
488 nm
8.2 mm
4.7°
543 nm
9.1 mm
5.2°
594 nm
10.0 mm
5.7°
635 nm
10.7 mm
6.1°
650 nm
10.9 mm
6.3°
730 nm
12.3 mm
7.0°
780 nm
13.1 mm
7.5°
808 nm
13.6 mm
7.8°
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
488
26%
515
16.5%
594
2.3%
638
0.3%
654
0.3%
673
0.7%
687
1.2%
778
7.3%
描述 [描述] Design wavelengths: 780 nm