DE-R 392 Diffractive Optical Element
- Element Number: DE-R 392
- Current Product Revision: A
- Description: 3 Lines (Rectangular)
-Substrate Material: Polycarbonate (PC)
-Size (Ø x Thickness): 8 x 1.2 mm
- Design Wavelengths: 650 nm
- Recommended Wavelength Range: 600-700 nm
- Minimum Recommended Beam Diameter: 1.5-2 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 (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
wc [mm]
hc [mm]
wE [mm]
hE [mm]
Width
Height
θH [°]
θv [°]
532 nm
8.7
42.7
8.6
42.6
98.8%
99.9%
5.0
24.1
592 nm
9.7
47.7
9.6
47.7
99.3%
100.0%
5.6
26.8
635 nm
10.4
51.4
10.4
51.4
99.7%
100.0%
6.0
28.8
650 nm
10.7
52.7
10.6
52.7
99.9%
100.0%
6.1
29.5
660 nm
10.8
53.6
10.8
53.6
100.0%
100.0%
6.2
30.0
685 nm
11.2
55.8
11.3
55.8
100.3%
100.0%
6.4
31.2
690 nm
11.3
56.2
11.4
56.2
100.3%
100.0%
6.5
31.4
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 (min.)
0-Order Intensity (typ.)
0-Order Intensity (max.)
447
24.0%
25.5%
27.7%
516
5.7%
6.6%
7.6%
532
3.7%
4.4%
5.3%
638
0.7%
1.0%
1.4%
652
1.2%
1.6%
2.0%
689
3.2%
3.8%
4.5%
750
7.8%
8.7%
9.5%
801
12.1%
13.2%
14.2%
描述 [描述] Design Wavelengths: 650 nm