Calculating Sideways Force on Lens from Laser Power

In summary, the sideways force on the lens can be calculated by considering the deflection of a stream of particles from the laser, using the focal length and intensity of the laser. The average radiation pressure equation, I/c, may not be useful in this scenario.
  • #1
andrewm
50
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Homework Statement


A laser of power P with wavelength [tex]\lambda[/tex] is directed through a lens (focal length f) off the optical axis by a distance d. What is the sideways force on the lens?


Homework Equations



Not sure. The average radiation pressure is I/c, where I is the intensity. But this does not seem useful.
 
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  • #2
You can just think of this classicaly.
Imaging a stream of particles being deflect downward by a certain angle - just calculate the resulting force on the deflector.

The angle you get form the focal length - the number of particles (photons) from the intenisty and the momentum form the wavelength
 

FAQ: Calculating Sideways Force on Lens from Laser Power

How do you calculate the sideways force on a lens from laser power?

To calculate the sideways force on a lens from laser power, you will need to use the formula F = P/c, where F is the force in Newtons, P is the laser power in Watts, and c is the speed of light in meters per second. This formula assumes that the laser is being absorbed by the lens, not transmitted or reflected.

What units should be used for laser power and sideways force?

Laser power should be measured in Watts (W) and sideways force should be measured in Newtons (N). These are the SI units for power and force, respectively.

Are there any other factors that need to be considered when calculating sideways force on a lens from laser power?

Yes, there are a few other factors that may affect the calculation of sideways force. These include the angle of incidence of the laser beam on the lens, the distance between the laser and the lens, and the properties of the lens material (such as its absorption coefficient).

Is there a maximum sideways force that a lens can withstand from laser power?

Yes, there is a limit to the sideways force that a lens can withstand before it becomes damaged. This limit will vary depending on the type and quality of the lens. It is important to consult the manufacturer's guidelines and make sure the force applied to the lens does not exceed its maximum threshold.

Can the calculation of sideways force on a lens from laser power be used for all types of lenses?

No, the calculation may not be applicable to all types of lenses. It is most accurate for thin lenses that are being directly hit by the laser beam. For more complex lenses, such as thick or curved lenses, additional factors may need to be considered in the calculation.

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