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Anonymous Poster

# Simple Optical Design

12/02/2007 2:26 AM

Hi all, i am designing a plano-concave diverging lens, object is point source. I want to compute the radius of curvature to diverge the light rays by additional angle. Any experts to help me out?

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Guru

Join Date: May 2006
Location: Reading, Berkshire, UK. Going under cover.
Posts: 9687
#1

### Re: Simple Optical Design

12/02/2007 4:57 AM

Sky scientific do software for lens design. They do a free trial download. I haven't tried it, but it may be useful for your app.

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Anonymous Poster
#2

### Re: Simple Optical Design

12/03/2007 11:45 AM

Call any one of a number of optics companies in Rochester NY. The Rochester Cluster has several world class optics houses. I have found that engineers love to teach.

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Associate

Join Date: Mar 2007
Location: Pittsburgh, PA, USA
Posts: 47
#3

### Re: Simple Optical Design

12/08/2007 3:35 PM

I don't know what your intended use is or how accurately you need to know the radius. A computer program for optical design is the best approach.

However, if an approximate solution is sufficient, then using paraxial or first order equations will work.

The following are good references

Melles Griot has a good introduction to fundamental optics. Look over the "Sign conventions", "Basic Paraxial Equations", and ""Paraxial Formulaie for Lenses in Air".

wikipedia also has the paraxial equations.

Consider this plano-concave lens

First, determine how much divergence you want. From geometry, identify the location of S1 and S2.

The point light source is at the left (S1) and after the rays are bent (diverged), they appear to come from S2.

Then the focal length of the lens, f, is given by

1/f = 1/S1 - 1/S2

The minus sign comes from S2 being on the left of the lens. And the focal lengh of the lens is negative.

1/f = (n-1)*(1/R)

where n is the index of refraction of the lens material. For crown glass this is 1.52

Participant

Join Date: Jan 2008
Posts: 1
#4

### Re: Simple Optical Design

01/03/2008 5:09 PM

You might want to contact OSCI Inc's President, Michael Pate. He is an expert in optical lens design and has helped us with some tough lens design issues. www.oscintl.com or 541.255.2165

Participant

Join Date: Jan 2020
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#5

### Re: Simple Optical Design

01/13/2020 6:26 AM

Plano-sunken focal points, which include insignificant circular deviation when the curved surface is confronting the longest conjugate separation, are utilized to grow light shafts or to increment central lengths in existing optical systems.Jun 14, 2018. virtual office address | virtual business address

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