Partial Reflectors

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partial reflectorThe most common uses of partial reflectors are as output couplers or beam attenuators. In these applications, they are intended for use at (or close to) normal incidence. The standard coatings described here will perform to specification if used within 10° to 15° of normal incidence, depending upon the reflectivity.

Specifications:

1. Material: CVD-ZnSe
2. Diameter tolerance, mm: +0.0 / -0.1
3. Thickness tolerance, mm: +0.1 / -0.2
4. Thickness (radiused) tolerance, mm: +/- 0.25
5. Parallelism, arc min:  
  plano: <= 3
  radiused, diameter < 1": <= 10
  radiused, diameter >= 1": <= 5
6. Surface figure (power-irregularity) @ 633 nm:  
  plano, fringe: 1 - 1/2
  rudiused: depends on radius
7. Surface quality, scr/dig: 40/20
8. Side 1: Reflectivity tolerance
@ 10.6 µm:                    1% - 5%
+/- 0.5% x R
  6% - 85%                +/- 5%
  86% - 95%                +/- 2%
  96% - 98%                +/- 1%
  99% - 99.5%                +/- 0.2%
9. Side 2: AR Coating reflectivity per surface
@ 10.6 µm:
<= 0.5%

 Maximal diameter – 50.8 mm.

Standard sizes:

Diameter Thickness
inches mm inches mm
0.250 6.35 0.080 2.0
0.375 9.52 0.080  2.0
0.50 12.7 0.080  2.0
0.75 19.1 0.080  2.0
1.00 25.4 0.120  3.0
1.00 25.4 0.236  6.0
1.10 27.9 0.120  3.0
1.10 27.9 0.236  6.0
1.50 38.1 0.120  3.0
2.00 50.8 0.200  5.1
2.00 50.8 0.300  7.6

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