Calculating the heating effect of a Class IV laser

AI Thread Summary
The discussion focuses on calculating the heating effect of a Class IV laser on a target material, specifically using ND:YAG lasers. The key factor influencing temperature increase is the amount of energy absorbed by the material, particularly within the laser beam. The user seeks equations to determine the surface temperature, noting that the area directly exposed to the beam will experience a greater temperature rise than surrounding areas. Understanding the laser's specifications, such as output energy and repetition rate, is crucial for accurate calculations. The conversation emphasizes the importance of energy absorption in determining temperature changes in the target material.
alex111888
Messages
4
Reaction score
0
Hi guys,

I am of a Mechanical Engineering background, however my dissertation has a largely optics based focus, and I am struggling with understanding the heating effect of a Laser.

I will be using various wavelength ND:Yag lasers, and will be focussing them onto a target material, which I have not yet decided upon. I need to be able to calculate the heating effect of the laser on this material.

For example, if I pulse the laser constantly for 2 seconds, what will be the temperature increase of the material?

For arguement's sake, we could consider the laser to be of these specifications:

Dimensions
Laser transmitter 325 x 201 x 119 mm
Laser receiver 105 x 77 x 23 mm
Mass
Laser transmitter < 7.5 kg
Laser receiver < 0.5 kg
Aperture
10 mm
Beam Divergence
Tactical @ 1.06 μm < 1 mRad
Output Energy
< 300 mJ @ 1.06 μm
< 90 mJ @ 1.57 μm
Repetition Rate
20 Hz (on both wavelengths)
Average Power
< 325 W

Thank you very much for your input.

Alex
 
Science news on Phys.org
The temperature increase will be driven by the amount of absorbed energy, nothing more- unless the pulse is of ~fs duration.
 
thank you for your reply. I am ultimately looking for the surface temperature within the beam of the laser. As surely the part inside the beam will become much hotter than that outside? also- do you have any kind of equations that would be appropriate?
 

Thread 'Condensate rate of water for an air conditioning cooling coil'

I need to calculate the amount of water condensed from a DX cooling coil per hour given the size of the expansion coil (the total condensing surface area), the incoming air temperature, the amount of air flow from the fan, the BTU capacity of the compressor and the incoming air humidity. There are lots of condenser calculators around but they all need the air flow and incoming and outgoing humidity and then give a total volume of condensed water but I need more than that. The size of the...
View full post »
Thread 'Why work is PdV and not (P+dP)dV in an isothermal process?'

Thread 'Why work is PdV and not (P+dP)dV in an isothermal process?'

Let's say we have a cylinder of volume V1 with a frictionless movable piston and some gas trapped inside with pressure P1 and temperature T1. On top of the piston lay some small pebbles that add weight and essentially create the pressure P1. Also the system is inside a reservoir of water that keeps its temperature constant at T1. The system is in equilibrium at V1, P1, T1. Now let's say i put another very small pebble on top of the piston (0,00001kg) and after some seconds the system...
View full post »

Hot Threads

Recent Insights

Back
Top