CCD-world: LED with very stable light fux

[B.Nagaraja Naidu]

The following was posted to CCD-world:

Hello, Dorn,

Roger Smith of CTIO, has described a compact stabilized pulsed LED source
in his paper presented at a workshop on "Optical Detectors for Astronomy"
at ESO, Garching in 1996. You may refer to the paper "How linear are
typical CCDs" by Roger M Smith in the proceedings of this workshop.

Regards

naidu

On Wed, 19 Apr 2000, Reinhold Dorn wrote:

> 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
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