DE-R 381 Diffractive Optical Element
- Element Number: DE-R 381
- Current Product Revision: A
- Description: 11 Lines (Rectangular)
- Substrate Material: Polycarbonate (PC)
- Size (Ø x Thickness): 8 x 0.63 mm
- Design Wavelengths: 850 nm
- Recommended Wavelength Range: 830-880 nm
- Minimum Recommended Beam Diameter: 2-3 mm
This Large-angle pattern is subject to geometrical distortion due to its symmetry properties, if the DOE is used at laser wavelengths significantly different (Δλ > 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
If the DOE is used at laser wavelengths close to the design wavelength (Δλ < 50nm) the geometrical distortion is usually tolerable (see table below).
Wavelength
Pattern Size @ 100 mm Distance
Ratio corner-to-center
Pattern Angles
λ [nm]
wc [mm]
hc [mm]
wE [mm]
hE [mm]
Width
Height
θH [°]
θv [°]
652
31.6
103.7
28.5
102.9
90.3%
99.3%
17.9
54.8
687
33.3
110.9
30.5
110.2
91.6%
99.4%
18.9
58.0
752
36.5
125.3
34.5
124.8
94.4%
99.6%
20.7
64.1
801
39.0
137.1
37.8
136.8
97.0%
99.8%
22.1
68.9
825
40.2
143.3
39.6
143.1
98.4%
99.9%
22.7
71.2
850
41.5
150.0
41.5
150.0
100.0%
100.0%
23.4
73.7
893
43.7
162.4
45.0
162.8
103.1%
100.2%
24.6
78.2
923
45.2
171.8
47.7
172.5
105.5%
100.4%
25.5
81.3
980
48.2
191.6
53.5
193.3
111.0%
100.9%
27.1
87.5
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 TM
(min)
0-Order Intensity TM
(typ.)
0-Order Intensity TM
(max)
0-Order Intensity TE
(min)
0-Order Intensity TE
(typ.)
0-Order Intensity TE
(max)
684 nm
9.2%
11.7%
14.4%
14.7%
17.2%
19.9%
749 nm
2.4%
3.6%
5.0%
5.7%
7.4%
8.8%
800 nm
0.2%
0.7%
1.3%
2.0%
2.9%
3.7%
845 nm
0.1%
0.2%
0.2%
0.6%
1.0%
1.3%
893 nm
0.5%
1.1%
1.5%
0.1%
0.5%
0.8%
940 nm
2.2%
3.0%
3.9%
0.5%
1.2%
1.9%
980 nm
3.8%
4.8%
6.0%
1.4%
2.2%
3.1%
描述 [描述] Design Wavelengths: 850 nm