For detectors see Alphalas, for example (cheap good and fast). You can find theoretical background and some explanations in papers of Miguel Andres (Bou) (Valencia) and Yu. Hi, now I am puzzled by the question of how I can calculate the intensity power density in a scientific way? Is there any relative experiment?How does the factor 2*pulse energy/cross section area comes for the gaussian beam and for top hat it it not present? Power density calculation of Laser Thread starter shyamavanil; Start date Jul 2, 2009; Jul 2, 2009 #1 shyamavanil. By continuing to use this site, you agree to our use of cookies. After the reaction in the surrounding zones, a compressive stress field is generated within the affected volume, while the underlying layers are in a tensile state (When the dynamic stresses of shock waves within a material are above the dynamic yield strength of the material, plastic deformations occurs, which continues until the peak dynamic stress falls below the dynamic yield strength. This can be done with the help of the below formula:

As a rule of thumb, an …

Blowing off the high-temperature plasma on the surface can induce a high pulse pressure on the material surface. Use this calculator to determine the power density and/or fluence (energy density) of your laser beam.Sorry, your search yielded no standard sensors that match your application.Please revise your search by enlarging beam diameter, reducing power, energy, pulse rate, etc.Please revise your search using the following tips:If you still do not find a match, please save your laser data in file and send it by mail to:We will try to find the best solution for your applicationSend us your information and we will assist you as quickly as we can. This site is home to The Evaluator – LIA's Web-based Laser Safety Hazard Analysis System. Data.How to find full width at half maximum (FWHM) using Origin?Anyone know how to find FWHM using Origin software?How to calculate the Maximum energy per pulse (in J/cm2) for the laser?1. For pulsed lasers in the range of µsec to nsec, the energy density varies as a function of the square root of the time domain. That means you need to know two things to calculate it: (1) the laser pulse's power (2) the area Laser Power Density Calculator Sometimes its very important to check the power density of a laser beam when you use it on your projects or at work because the difference in power density of laser can actually damage the optic lens. Voltages range from a few hundred kilovolts to...Performance characteristics of a high repetition rate rare-gas halide minilaser are reported. By definition, power density is power per unit area which is usually expressed in terms of W / cm2. Copyright © 2020 Ophir Optronics Solutions Ltd In order to give you the best experience, our website uses cookies. This means that at the 1 µsec time domain (10-6 sec compared to 10 x 10-9 sec), the optic can withstand 10 times more energy (20 J/cm2).Expressing laser damage threshold (LDT) in equation form:as in the example above, x = 1 microsec or 10-6 sec, and y = 10 nsec or 10 x 10-9 secIn the realm in between pulsed and CW applications (in the msec range), compare both the average power with the CW threshold and the pulse energy density with the energy specification.In the millisecond range, there is a crossover between pulse and CW regimes where you should try to satisfy both criteria.Please note that for pulsed lasers, there may be hot spots in the output beam. This convenient online tool will calculate what optical density is recommended for use with a laser system of a given power. This calculator assumes square pulses. 4.1 Rate Equations In section 2.5, we derived for the interaction of a two-level atom with a laser field propagating to the right the equations of motion (2.171) and (2.172), The laser absorptivity of the solid metal is much slower than that of room temperature changing to the melting temperature of the metal. ... Power density is the power delivered by the laser per unit area. Mechanical properties of material are summarised in Laser beam irradiates on the surface of the material and interacts with it. When you solve for PowerDensity = Power(W) / πr2 = Power / π(0.5mm)2 ≈ 127 x Power (W/cm2); the answer should 1.27 x Power (W/cm2) unless I am missing something. For pulsed lasers in the range of µsec to nsec, the energy density varies as a function of the square root of the time domain. What is the most appropriate equipment to measure the intensity of a laser beam?Pulsed electron beam guns have been used extensively in high energy, pulsed laser systems.

As a result, deep penetration mode is the preferred process.In deep penetration welding, free electrons of metallic vapor from the molten pool surface and the keyhole wall, and shielding gas are accelerated by absorbing laser energy. Suppose, for instance, that the damage threshold is rated at 2 J/cm2 for 10 nsec pulses, but your laser has a 1 µsec pulse length. We provide peak power density threshold values for most laser power detectors, thanks to a simple calculation relating energy density threshold to the former. This attenuated elliptical beam is then incident on a fiber of approximately 0.36 mm width, clamped vertically.

27 When fibres and matrix exhibit only slightly different vaporisation times (e.g.

The value is actually closer to 255, not 250, but this difference is trivial, introducing only ~2% error. What you might not have noticed is that we are also converting mm^-2 to cm^-2, so we need to add two orders of magnitude. Finally, if you know the diameter of the beam you can calculate the intensity power density.It gave me good performance and repeatability. For a Gaussian beam with a given beam waist in mm,  multiply this formula by two to obtain the formula given above (The multiplication factor is due to the fact that for a Gaussian beam, the peak power in the center is twice the average power density of the beam.

This can be done with the help of the below formula: where, LPD = Laser Power Density [W/cm 2] 30 The relationship between the vaporisation of the common constituents of FRPs and the beam power density versus interaction time is illustrated in Fig.11.2. 2 0.