DE-R 234 Diffractive Optical Element
• Element Number: DE-R 234
• Current Product Revision: B
• Description: Viewfinder (Square)
• Substrate material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design wavelengths: 633 nm
• Recommended wavelength range: 590-730 nm
• Minimum recommended beam diameter: 2-3 mm
Geometry and Diffraction Angles
Within the recommended wavelength range, the zeroth order central spot is not visible on the line. This Largeangle pattern is subject to geometrical distortion due to its symmetry properties, if the DOE is used at laser wavelengths significantly different (∆λ > 50nm) from the design wavelength. 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.
Wavelength
Pattern Size @ 100 mm Distance
Pattern Angles
a
b
α
β
488 nm
64 mm
46 mm
35°
26°
543 nm
72 mm
51 mm
40°
29°
594 nm
80 mm
57 mm
43°
32°
635 nm
86 mm
61 mm
47°
34°
650 nm
89 mm
63 mm
48°
35°
730 nm
102 mm
71 mm
54°
39°
780 nm
111 mm
77 mm
58°
42°
808 nm
116 mm
80 mm
60°
44°
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
20.3%
515
14.3%
594
2.4%
638
0.3%
654
0.1%
673
0.3%
687
0.7%
778
5.9%
描述 [描述] Design wavelengths: 633 nm