CCD-world: LED with very stable light fux

[Reinhold Dorn]

The following was posted to CCD-world:


 Hello CCD-world,

 I am working on a new designed CCD for curvature wavefront
 sensing, which measures the light at a location between the 
 the pupil plane and the image plane. In a real system, there
 is a membrane oscillating at a fixed frequency around 2 kHz and
 the CCD  measures the photons collected during the intrafocal 
 and extrafocal periods. From these signals we than calculate the 
 normalized difference to be able reconstruct the wavefont tilts.

 To simulate the optical setup and to test the performance of
 the CCD independently of the optical bench, I am locking for 
 very stable light source, preferred an LED. This LEDs should have
 stable rise and fall times in the range of 0 to 5 microseconds and 
 a very stable flux for a certain amount of time (i.e. 240 microseconds).
 Note that we try to move just a couple of electrons with the CCD and 
 therefore the LED flux should be extremely stable.
 
 The LED could then be driven by a clock pulse of the CCD controller 
 with and accuracy of 25 ns. 
 

  flux
   |
   |     /----\         /----\
   |----/      \-- ----/      \------ time

 Does anyone know of a manufacturer or any source which is 
 producing an LED with those requirements. Any help is welcome.

  Best wishes from Garching,

                       Reinhold Dorn

 --------------------------------------------------------------------
 Reinhold Dorn                          e-mail: reinhold.dorn at eso.org
 ESO-European Southern Observatory      phone : +49-89-32006-547
 K.Schwarzschildstr.2,D-85748 Garching  fax   : +49-89-3202362
 http://www.eso.org/odt                   http://pc002863.hq.eso.org
 --------------------------------------------------------------------
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