Engraving laser machine with a lens

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    Laser Lens Machine
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Discussion Overview

The discussion revolves around the effects of a cracked lens on the performance of an engraving laser machine. Participants explore questions related to focusing, beam diameter, power, and the use of multiple lenses in the system.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that the crack in the lens may introduce air with a different refractive index, potentially causing reflections and scattering.
  • Another participant asserts that the crack deviates from the ideal lens shape, which could affect focusing capabilities.
  • Regarding the use of two lenses, one participant notes that the final beam diameter may not necessarily be smaller than with one lens, but it is a possibility.
  • There is uncertainty about whether the focus distance will be double when using two lenses, with a general indication that it may not be the case depending on the lenses used.
  • Questions are raised about whether the power will be doubled with two lenses, with a reference to energy conservation principles.
  • Participants discuss the necessity of a real distance between the two lenses, with a caution that if the second lens is placed at the focus distance of the first, it could potentially break if the laser intensity is high enough.
  • One participant suggests replacing the cracked lens as a solution.

Areas of Agreement / Disagreement

Participants express differing views on the implications of the cracked lens and the effects of using multiple lenses, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

There are limitations regarding the assumptions made about lens behavior, the dependence on specific lens types, and the unresolved nature of the mathematical implications of using multiple lenses.

sml2010
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Hi
I have a laser beam(engraving laser machine) and then use a lens for focus the beam but my lens has a crack on the center of lens and when i use my laser in high power the beam diameter will bigger and burning area zone is bigger so:
1- Does the crack doesn't let the maximum focus?in law or high power?
2-1- I if i use two lenses with a exact distance, does the final beam diameter will be smaller than one lens?
2-2- Does the focus distance will be double?
2-3- Does the power will be double?
2-4- does a real distance(focus distance) between two lenses is necessary? if i put the second lens in focus distance of first lens, it will broken or not?

I am wait for your help.

Thank you
 
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The crack will probably be full of air which has a different refractive index to the glass the lens is made of. So it's possible to get reflections and scattering off the surface of the crack.
 
1- Does the crack doesn't let the maximum focus?in law or high power?
The crack is always a deviation from the ideal shape. Sure.

2-1- I if i use two lenses with a exact distance, does the final beam diameter will be smaller than one lens?
Not necessarily, but it is possible.
2-2- Does the focus distance will be double?
Depends on the lenses (in general: no).
2-3- Does the power will be double?
Energy conservation? ...

2-4- does a real distance(focus distance) between two lenses is necessary? if i put the second lens in focus distance of first lens, it will broken or not?
If the laser intensity is sufficient, you can even heat lenses (which are designed to let most light through it), sure.
 
sml2010 said:
Hi
I have a laser beam(engraving laser machine) and then use a lens for focus the beam but my lens has a crack on the center of lens <snip>
I am wait for your help.

You should replace the lens.
 

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