DE-R 257 Diffractive Optical Element
• Element Number: DE-R 257
• Current Product Revision: B
• Description: Matrix 51 x 51 Dots
• Number of Dots: 2601 Dots
• Substrate material: Polycarbonate (PC)
• Size (Ø x Thickness): 8 x 1.2 mm
• Design wavelengths: 660 nm
• Recommended wavelength range: 560-720 nm
• Minimum recommended beam diameter: 3.5-4 mm
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. 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. Within the recommended wavelength range, the zeroth order has a similar power than the off-axis beams of the dot matrix. 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
38 mm
27 mm
0.54 mm
27 mm
22°
15.5°
0.31°
15.5°
515 nm
44 mm
31 mm
0.62 mm
31 mm
25°
17.7°
0.35°
17.7°
532 nm
45 mm
32 mm
0.64 mm
32 mm
25°
18.3°
0.37°
18.3°
635 nm
55 mm
39 mm
0.77 mm
39 mm
31°
22°
0.44°
22°
650 nm
56 mm
40 mm
0.79 mm
40 mm
31°
22°
0.45°
22°
730 nm
64 mm
45 mm
0.89 mm
45 mm
35°
25°
0.50°
25°
780 nm
68 mm
48 mm
0.96 mm
48 mm
38°
27°
0.54°
27°
808 nm
71 mm
50 mm
1.00 mm
50 mm
39°
28°
0.56°
28°
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
33.2%
515
11.3%
532
7.8%
594
0.8%
638
0.1%
654
0.3%
687
1.6%
751
5.8%
描述 [描述] Design wavelengths: 660 nm