DE-R 259 Diffractive Optical Element
• Element Number: DE-R 259
• Current Product Revision: B
• Description: 5 Rings
• Substrate material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design wavelengths: 645 nm
• Recommended wavelength range: 530-700 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 element shows the lowest intensity in the central spot. Diffraction efficiencies given on this datasheet have been measured using elements of product revision B.
Geometry and Diffraction Angles
Wavelength
Pattern Size @ 100 mm Distance
Pattern Angles
a
b
α
β
450 nm
35 mm
3.5 mm
20°
2.0°
515 nm
41 mm
4.1 mm
23°
2.3°
594 nm
42 mm
4.2 mm
24°
2.4°
635 nm
50 mm
5.0 mm
28°
2.8°
650 nm
52 mm
5.2 mm
29°
2.9°
730 nm
59 mm
5.9 mm
33°
3.3°
780 nm
63 mm
6.3 mm
35°
3.5°
808 nm
66 mm
6.6 mm
36°
3.6°
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
16.4%
515
9.8%
594
0.8%
638
0.7%
654
1.2%
669
2.1%
687
3.0%
780
10.6%