What is the power density of a laser?
Aside from energy density, a second important parameter in lasers measurement is a power density. The power density (irradiance) is a ratio of power (P) in Watt (W) to the cross section area (I=W/cm2). The importance of this will be clarified when we consider the interaction of laser beams with different materials [5].
How powerful is a tattoo removal laser?
The go-to laser for most tattoo removal practitioners is an Nd:YAG laser, such as the Astanza Duality, because it is capable of producing the most versatile wavelengths: 1064 nm and 532 nm. These two powerful wavelengths can completely remove 95% of tattoos.
Can a tattoo be 100 percent removed?
“You can’t be sure that you’re going to get 100 percent clearance on a tattoo, and that’s for a variety of reasons, including the type of ink and if [the tattoo] was done by a professional tattoo parlor,” he says. Myth #6: If you had no reaction to getting a tattoo, you’ll have no reaction to getting it removed.
How do you calculate the power density of a laser?
By definition, power density is power per unit area which is usually expressed in terms of W/cm2. The Calculation of power density is straightforward. By simply calculating the area of a beam using the radius in cm and dividing the beam’s power by that area the power density in units of W/cm2 is easily obtained.
How is power density calculated?
Convert the diameter to cm, Divide the diameter by two to find the radius, Use πr^2 to find the area in cm^ And, finally, divide the laser power by the area to obtain power density.
What is the energy density of ultrafast lasers?
At high power densities in the range of 10 12 W cm −2 produced by ultrafast (sub-ps and fs) lasers, the diameter of hole drilled can be smaller than the diffraction limit. At these high laser power densities, the multiphoton absorption process and the threshold laser fluence for ablation is deterministic and precise.
How is the energy density of a tophat laser calculated?
Tophat calculations are for ideal tophat laser beams. For beams that are not 100% uniform, the peak power/energy density will be higher. Gaussian beam intensity is calculated for the 1/e^2 (13.5% of peak) beam diameter. Searching…
How to calculate the peak power of a laser?
• Sensor Finder • Laser Peak Power Calculator • Laser Focal Spot Size Calculator • Laser Power Through Aperture Calculator • Laser Focusability Calculator Tophat calculations are for ideal tophat laser beams. For beams that are not 100% uniform, the peak power/energy density will be higher.
How to calculate the energy of a CW laser?
CW or pulsed laser: Pulse Energy (Joules) = Average Power (Watts) * Pulse Duration (Seconds) Again, let’s use some real values and assume you are working with a CW laser that outputs 500 W. If you fire this laser at an object for exactly 5 seconds, then you have 500 W * 5 s = 2500 J.
