DE-R 288 Diffractive Optical Element
• Element Number: DE-R 288
• Current Product Revision: A
• Description: Viewfinder
• Substrate material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design wavelengths: 650 nm
• Recommended wavelength range: 590-730 nm
• Minimum recommended beam diameter: 2-3 mm
Within the recommended wavelength range, the zeroth order central spot is not visible on the line. 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 A.
Geometry and Diffraction Angles
Wavelength
Pattern Size @ 100 mm Distance
Pattern Angles
a
b
c
α
β
γ
450 nm
64 mm
54 mm
35 mm
36°
30°
19°
515 nm
75 mm
63 mm
41 mm
41°
34°
22°
532 nm
78 mm
65 mm
42 mm
43°
35°
23°
635 nm
96 mm
81 mm
52 mm
51°
43°
27°
650 nm
99 mm
83 mm
54 mm
53°
44°
28°
730 nm
115 mm
96 mm
62 mm
60°
49°
31°
780 nm
126 mm
105 mm
68 mm
64°
53°
34°
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
594
2.0%
638
0.8%
654
0.7%
673
1.1%
687
1.6%
778
7.4%
描述 [描述] Design wavelengths: 650 nm