Documentation
![[Rainbowline]](../rainbowline.gif)
F/N Conversion System
System #1
Basic Data
| Manufacturer | Sill Optics(D) |
| Date | July 1997 |
| Wavefront (collimated) | < lambda/2 p-V, < lambda/12 rms |
| Efficiency | 94% average (350-900nm) |
Wavefront aberrations
The interferogram (recollimated, double pass) gives a wavefront
aberation less lambda/2 p-V and lambda/12 @ 633 nm. The
system improves for finite magnification for which it is designed.
The optically active region is indicated by the inner circle.
![[FN1 Interferogram]](fn1IF.jpg)
System #2
Basic Data
| Manufacturer | Sill Optics(D) |
| Date | July 1997 |
| Wavefront (collimated) | < lambda/2 p-V, < lambda/12 rms |
| Efficiency | 94% average |
Wavefront aberrations
The interferogram (recollimated, double pass) gives a wavefront
aberation less lambda/2 p-V and lambda/12 @ 633 nm. The
system improves for finite magnification for which it is designed.
The optically active region is indicated by the inner circle.
![[FN1 Interferogram]](fn2IF.jpg)
Efficiency
The AR coatings used by Tafelmaier (D) are a single-layer MgF2 coating
for the FK54 and multilayer coatings for all other surfaces. The
multilayer coatings are optimized to compensate for the run of
the MgF2 which results in a very smooth total transmission with a
slight enhancement towards the blue.
The total efficiency curve below is computed for both systems from the
measured AR coating curves and the catalogue glass data. The average
transmission from 350-900 nm is 94%.
![[FN Efficiency]](FNSilltrans.gif)
![[INDEX]](/lsw/icons/latex2html/index_motif.gif)
If you have any comments on the FEROS project, please send me a
mail .
FEROS homepage / A.Kaufer@lsw.uni-heidelberg.de
Last modified: Fri Jan 26 12:20:32 MET 2001