DE-R 218 Diffractive Optical Element
• Element Number: DE-R 218
• Current Product Revision: B
• Description: Cross – 15 @ 640
• Number of Spots on Line: 605
• Substrate Material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design Wavelengths: 640 nm
• Recommended Wavelength Range: 500-640 nm
• Minimum Recommended Beam Diameter: 2-3 mm
Within the recommended wavelength range, the zeroth order is not brighter than the rest of the cross. 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. Diffraction efficiencies given on this datasheet have been measured using elements of product revision B.
Pattern Geometry and Diffraction Angles
Wavelength
Patttern Size @ 100 mm Distance
Pattern Angle
a
α
450 nm
17 mm
10.5°
515 nm
21 mm
12.0°
532 nm
22 mm
12.4°
594 nm
24 mm
13.9°
635 nm
26 mm
14.9°
650 nm
27 mm
15.2°
730 nm
30 mm
17.1°
780 nm
32 mm
18.3°
808 nm
33 mm
19.0°
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 isattenuated.
Diffraction Zero Order Intensity:
Wavelength
0-Order Intensity
448
31%
532
7.3%
594
1.2%
638
1.0%
654
1.4%
687
3.1%
801
11.5%
MOUNTED VERSION
For testing or setups under laboratory conditions we offer a version mounted in 12.7 mm stainless steel frame for use with standard laboratory holders.
COLLIMATED / CONVERGI NG LASER
The laser can be collimated for long range use or converging for a fixed working distance. Please note that the size/thickness of each spot or line depends on the focusing of the laser.
描述 [描述] Design Wavelengths: 640 nm