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.

VA
VA
λ [nm]0° → 45°; T= method 
157 70% → 2% on CaF2 EBE  
  10% → 70% on CaF2 EBE inversely (IVA)
193 80% → 10%   EBE  
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
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