DE-R 254 Diffractive Optical Element
• Element Number: DE-R 254
• Current Product Revision: B
• Description: 25 Lines (Square)
• Substrate material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design wavelengths: 660 nm
• Recommended wavelength range: 530-670 nm
• Minimum recommended beam diameter: 3.5-4 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 B.
Geometry and Diffraction Angles
Wavelength
Pattern Size @ 100 mm Distance
Pattern Angles
a
b
c
d
α
β
γ
δ
450 nm
45 mm
32 mm
1.35 mm
32 mm
25°
18°
0.77°
18°
515 nm
52 mm
37 mm
1.55 mm
37 mm
29°
21°
0.88°
21°
532 nm
54 mm
39 mm
1.61 mm
39 mm
30°
22°
0.91°
22°
635 nm
66 mm
46 mm
1.93 mm
46 mm
36°
26°
1.09°
26°
650 nm
67 mm
48 mm
1.98 mm
48 mm
37°
27°
1.11°
27°
730 nm
77 mm
54 mm
2.2 mm
54 mm
42°
30°
1.25°
30°
780 nm
83 mm
58 mm
2.4 mm
58 mm
45°
32°
1.34°
32°
808 nm
86 mm
60 mm
2.5 mm
60 mm
47°
33°
1.39°
33°
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
448
31%
515
10%
532
6.9%
594
0.6%
638
0.14%
654
0.5%
687
2.0%
751
6.5%
描述 [描述] Design wavelengths: 660 nm