wavelengths
 

Variable Attenuators

Variable Attenuators VA
Change transmission by tilting of edge filters, with highest transmission at AOI 0°, mainly produced to work in the range from AOI 0° to 45°.

Inversely Variable Attenuators IVA
Work in the same way as VA but have lowest transmission at AOI 0°.

Given tolerances show the minimum tuning range in transmission. Beam displacement can be compensated by using a second plate or two filters simultaneously. For low attenuation we recommend an AR-coated second plate.

LASEROPTIK offers AVACS (Automatic Variable Attenuator Control System). The unit is driven by a stepper motor and can be controlled manually or by a computer. The AVACS includes power supply, control display, operation elements, starting routine, limit stop device, computer interface and water cooling.

Additionally a simple housing with manual adjustment can be supplied.

Coating types
VA
VARIABLES
  • VA
  • GOC
  • GP
  • GNF
  • GIF
VA
VA
λ [nm]0° → 45°; T= method 
157 70% → 2% on CaF2 EBE  
  10% → 70% on CaF2 EBE inversely (IVA)
193 80% → 10%   MS  
248 90% → 2% standard EBE  
  95% → 1% high power MS  
  10% → 95% high power MS inversely (IVA)
266 92% → 1% standard EBE  
  95% → 1% high power MS  
355 92% → 1% standard EBE  
  92% → 1% non-shifting IAD  
532 92% → 1% standard EBE  
  90% → 1% non-shifting IAD  
808 95% → 1% non-shifting IAD  
940 95% → 1% non-shifting IAD  
1064 95% → 1%   EBE  
  95% → 1% non-shifting IAD  
1550 95% → 1%   EBE  
2940 90% → 1% on CaF2 EBE  

All values are given for standard coatings. Customized coatings available for all types.

Coating methods available:

EBEIADIPMSIBS

Examples

If not mentioned otherwise, all values and diagrams are given

... for the standard substrate material used in the described wavelength area (mostly Fused Silica or CaF2).

... without consideration of the rear surface.

... with EBE coating technique for a good cost-performance ratio.

Customized coatings are available for all types.

 

–––– dashed lines show the zoomed curve with the stated magnification

VA 1064 nm / 0-45° T 95-1%
[B-00431-01]VA 1064 nm / 0-45° T 95-1%

1064 nm: 0° -> 45°; T = 95% -> 1%

VA 1064 nm / 0-45° T 95-1%
[B-00431-01]VA 1064 nm / 0-45° T 95-1%

Angle resolved transmission at 1064 nm

IVA 248 nm / 15-45° T 10-95%
[B-01991]IVA 248 nm / 15-45° T 10-95%

248 nm: 15° -> 45°; T = 10% -> 95% (MS-coating)

IVA 248 nm / 15-45° T 10-95%
[B-01991]IVA 248 nm / 15-45° T 10-95%

Angle resolved transmission at 248 nm

Compensated Attenuator
Compensated Attenuator

Scheme

AVACS
[M-00013]AVACS

Automatic Variable Attenuator Control System

 
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