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Old 04-16-2015, 09:52 PM #17
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Default Re: Exact frequency range for a DPSS 532 nm and a 445 nm lasers.

Quote:
Originally Posted by lazeristasUVISIR View Post
This is not a common way to describe lenses for lasers. Most often surfaces radii are dimensioned in mm, and focal length in mm (not dioptic power)

The first lens is confusing too
Plano Convex
but then you write about convex and concave.

As both lenses are +, you'll build a Keplerian type expander. Any reasons why? The Galilean type is shorter at least.

Nothing confusing about Plano Convex, one side is flat, one side is convex.

You are correct though, radii and focal length are more typically measured in mm - at least for lasers.


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Old 04-17-2015, 12:33 PM #18
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Default Re: Exact frequency range for a DPSS 532 nm and a 445 nm lasers.

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Originally Posted by diachi View Post
Nothing confusing about Plano Convex, one side is flat, one side is convex. .
You missed a concave part
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Old 04-17-2015, 01:09 PM #19
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Default Re: Exact frequency range for a DPSS 532 nm and a 445 nm lasers.

Quote:
Originally Posted by Minamoto Kobayashi View Post
Plano Convex Lens:
base curve outer (convex): +9.00 diopters
base curve inner (concave): -1.25 diopters
dioptic power: +10.65
thickness at the center: 4.15 mm
diameter: 30 mm

Convex lens:
base curve outer (convex): +12.35 diopters
base curve inner (concave): -6.5 diopters
dioptic power: +6.75
thickness at the center: 3.3 mm
diameter: 30 mm
Lens surface powers should be added.
For Lens 1: +9 + (-1.25) = +7.75D. (Not +10.65) +7.75D -> f = 1/LensPower = 129 mm
For Lens 2: +12.35 - 6.5 = +5.85D. (Not +6.75) +5.85D -> f= 170 mm.

You should have a divergent lens too to make an real expander, as a combination of those two lenses will not expand much: 170/130 = x1.3.
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Old 04-17-2015, 02:40 PM #20
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Default Re: Exact frequency range for a DPSS 532 nm and a 445 nm lasers.

Hi,
Infact in my last message i say that there is also a small input lens

Sorry, I do not understand the purpose of Your calculation ... what means?
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Old 04-17-2015, 03:04 PM #21
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Default Re: Exact frequency range for a DPSS 532 nm and a 445 nm lasers.

Quote:
Originally Posted by Minamoto Kobayashi View Post
Hi,
Infact in my last message i say that there is also a small input lens

Sorry, I do not understand the purpose of Your calculation ... what means?
LOL Missed that part about the small lens.

I did not want to waste my calculations looking what you are looking for.
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