DE-R 253 Diffractive Optical Element
• Element Number: DE-R 253
• Current Product Revision: A
• Description: 11 Lines (Square – Thin Lines)
• Substrate material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design wavelengths: 635 nm
• Recommended wavelength range: 530-670 nm
• Minimum recommended beam diameter: 3-4 mm
Within the recommended wavelength range, the zeroth order central spot is not visible on the line. This Large-angle 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 A.
Geometry and Diffraction Angles
Wavelength
Pattern Size @ 100 mm Distance
Pattern Angles
a
b
c
d
α
β
γ
δ
488 nm
57 mm
41 mm
4.1 mm
41 mm
32°
23°
2.3°
23°
543 nm
64 mm
46 mm
4.6 mm
46 mm
36°
26°
2.6°
26°
594 nm
71 mm
50 mm
5.0 mm
50 mm
39°
28°
2.8°
28°
635 nm
76 mm
54 mm
5.4 mm
54 mm
42°
30°
3.0°
30°
650 nm
79 mm
55 mm
5.5 mm
55 mm
43°
31°
3.1°
31°
730 nm
90 mm
63 mm
6.3 mm
63 mm
48°
35°
3.5°
35°
780 nm
98 mm
68 mm
6.8 mm
68 mm
52°
37°
3.7°
37°
808 nm
101 mm
70 mm
7.0 mm
70 mm
54°
39°
3.9°
39°
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
9.8%
520
5.7%
594
0.1%
638
1.2%
654
2.0%
669
3.3%
687
4.6%
780
13.0%
描述 [描述] Design wavelengths: 635 nm