Re: [ATM] Bench star test

["Vladimir Galogaza" <vladimir.galogaza1@zg.t-com.hr>]

Jarvis,

>Laser diodes do not make good point sources because the diode emissions
>are generated in a short very thin line.

This is very true. And yet, region from which emission radiate
is very small.  Smaller than traditional point sources as described for 
Foucault
test  usage where holes are punched in a foil. It is difficult to make hole 
of the size
of laser diode face. Is the answer in the fact that holes, although bigger, 
are circular?


 >If the diode is not lasing,
>then the light source is excellent for use in the Foucault  or Ronchi
>test setup.

Why in this case diode should  not lase?


 >The diode must of course be rotated until the light source
>line is parallel to the knife edge or Ronchi screen.

This is analogy to the slit source usage.
Why this can't be done with lasing diode as well.


Regards
Vladimir.

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