Re: optics of choice

"redbelly" <redbelly98@xxxxxxxxx> wrote:

>
>West Coast Engineering wrote:
>
>> Laser beam enters the smaller lens from the flat sides and exits from
>> the concave side (which needs to be a conic to remove spherical)
>>
>> Then diverging beam stikes a convex surface (also a conic) and leaves
>> from the final flat side.
>>
>> Conic constants are determined using an optical design program or
>> through a lot of algebra to determine the conics which work.
>>
>> Jim Klein
>
>Okay, if the O.P. is willing to spend the time and money on aspheric
>lenses matched to his/her beam set-up, you're right.
>
>But for inexpensive off-the-shelf spherical lenses, the lens surface
>orientation is the reverse of what you say.
>
>Mark

Optimal shape factor is a function of N so using a simple design
program to check out the performance of each simpler design (using
plano-c or bi-type lenses is critical.

You can do it for free with the demo version of ODP
www.westcoastengineering.com or OSLO EDU

If the power is high, checking the positions of first order ghost
images is also a really good idea.

Using a negative group and a positive group almost always demands a
design code to evaluate combinations of off-the-shelf designs.

Jim Klein
.

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