# pulsed laser power density calculation worksheet

Role of Laser Power, Wavelength, and Pulse Duration in Laser ...- pulsed laser power density calculation worksheet ,In each sample, we allocated multiple regions of 0.5 cm × 0.5 cm in size and each region of the sample was irradiated separately using the laser radiation at certain wavelength, pulse duration, and pulse power density as shown in Table 1. The laser beam (70 μm diameter laser spot) was scanned with 50 μm step size in and directions. Note that ... Optimization of laser wavelength, power and pulse duration ...While rules 1 and 2 are easy to merge between them, rule 3 complicates the scenario since the maximum energy density per pulse depends on the number of pulses. Since each laser can deliver a maximum energy per pulse (MEP) in a range of Pulse Repetition Rates (PRR), a best combination of pulses and energy will exists for each specific device.

### Power density of laser beam Calculator

Power density of laser beam Solution. STEP 0: Pre-Calculation Summary. Formula Used. Power Density of laser beam = (4*Laser Energy Output)/ (pi*Focal length of lens^2*Beam divergence^2*Duration of laser beam) PD = (4*P)/ (pi*f^2*α^2*ΔT) This formula uses 1 Constants, 5 Variables. Constants Used. pi - Archimedes' constant Value Taken As 3 ...

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### Laser Safety Eyewear Calculations - Pro-Lite Technology

As a worked example, consider a pulsed Nd:YAG laser that produces 250mJ per pulse at 1064nm at a pulse repetition frequency of 10Hz. The duration of each pulse is 7ns and the accessible beam diameter is 7mm. The first step is to calculate the average power density of the laser. The beam area is pi * [3.5 x 10-3] 2 m 2, which equals 3.85 x 10-5 m 2.

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### Calibration Service for Low-level Pulsed-Laser Radiometers at ...

and Technology (NIST) for peak power or pulse energy of low-level laser pulses at the wavelength of 1.06 μm. This service supports the calibration of pulsed-laser radiometers at peak power levels of 40 nW to 5 mW and pulse energy from 100 fJ to 10 nJ. Laser-pulse durations can be varied from 20 ns to 2 μs depending on the instrument to be ...

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### Home | Lasercalculator

Calculate the round trip time and repetition rate of a pulsed laser. Photon energy calculator Calculate the energy of a photon from its wavelength, frequency or wavenumber.

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### Pulse energy calculator-square wave,capacitance charge,discharge

EXAMPLE#1: Pulse energy calculator for square wave pulse INPUTS: P =20 watts, t = 0.5 second OUTPUTS: E = 10 Joule . square wave pulse with equation. Following waveform and equation is used for this pulse energy calculator of square wave type.

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### Tech Note for Pulsed Beam Characterization

Peak Power per Pulse: Peak Power per pulse is determined by dividing the energy per pulse by the pulse duration. Where: P pk = Peak power in Watts E = Energy per pulse in Joules D pulse = Pulse duration at the full-width-half-maximum points. Example 1: A laser is operated at a 5 kHz repetition rate, at an average power of 2 Watts. Using this

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### Power Density Calculator | Calculator.swiftutors

The formula to calculate power density is given below: where, S = Power density [mW/cm 2] P = Antenna power input [mW] G = Antenna power gain. R = Distance to center of radiation of antenna [cm] In the below online power density calculator, enter the given input values and click calculate button to find the power density.

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### Formulas for Calculating the MPE, NOHD, and NHZ

Determination of the MPE for a repetitive pulsed laser: Determine the MPE for a Dye laser rated at 220µJ per pulse with emissions of 500 nm at 10Hz and a pulse duration of 800 ps. Rule 1: Rule 1 determines the MPE based on a single pulse of laser radiation. Using Table 5b of ANSI z136.1 we find the MPE to be a constant value: 789

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### 5. Laser Peak Fluence, Intensity and Peak Power - LIDARIS

Laser Peak Fluence, Intensity and Peak Power - LIDARIS. 5. Laser Peak Fluence, Intensity and Peak Power. Laser-Induced Damage Threshold (LIDT) is frequently expressed in units of laser peak fluence or laser peak power density. Let us take a closer look how it is evaluated. Laser fluence describes the energy delivered per unit (or effective) area.

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### Calculating Power Density – A Shortcut - Newport

Power Meters & Detectors Calculating Power Density – A Shortcut It is often necessary to calculate the power density (Power/Area) of a laser beam (for example, when trying to determine whether a beam will damage an optic or detector). Usually power density is expressed in terms of W/cm2. However, laser beam diameters are usually expressed in ...

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### 4. Energy, Power, and Photons - Brown University

The Energy density of a light wave The energy density of an electric field is: 2 1 2 UE E The energy density of a magnetic field is: 2 11 2 B UB Units check: In empty space: 0 = 8.854 10-12 C2/Nm2 Electric field: units of V/m 22 22 E CV U Nm m Using: C = Nm/V E 33 Nm Joule energy U mm volume

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### How to Calculate Optical Density for Laser Safety Glasses for ...

This is the highest energy per unit of surface area or power of a laser which is safe, as measured at the cornea, assuming a worst-case scenario. ANSI Z136.1 explains how to calculate MPEs. OSHA bases it on the radiation’s wavelength, the pulse duration, the amount of time its beams remains on the retina, and the size of the image that hits ...

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### Cold Laser Power Requirements And Cold Laser Therapy ...

Using an average class 3b dosage of 500 joules, we can calculate that a 900mW (.9w) laser in continuous mode will delivery that dosage in about 9 minute. If we pulse the laser with a 70% duty cycle, the time will be about 12 minutes. If the laser has a 100mW (.1w) max continuous output, the treatment time should be 83 minutes.

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### Power density of laser beam Calculator

Power density of laser beam Solution. STEP 0: Pre-Calculation Summary. Formula Used. Power Density of laser beam = (4*Laser Energy Output)/ (pi*Focal length of lens^2*Beam divergence^2*Duration of laser beam) PD = (4*P)/ (pi*f^2*α^2*ΔT) This formula uses 1 Constants, 5 Variables. Constants Used. pi - Archimedes' constant Value Taken As 3 ...

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### Laser Power Density - an overview | ScienceDirect Topics

Laser power density and interaction time show major effects on the extent of thermal damages in laser processing. 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. 27 When fibres and matrix exhibit only slightly different vaporisation times (e.g. polyester resin and aramid fibre) the ...

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### A Shortcut for Calculating Laser Power Density - Laser ...

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.

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### Pulse duration of laser Calculator

The Pulse duration of laser formula is defined as the time in seconds for which the laser is being operated on the surface of metal is calculated using Duration of laser beam = (4* Laser Energy Output)/(pi * Focal length of lens ^2* Beam divergence ^2* Power Density of laser beam). To calculate Pulse duration of laser, you need Laser Energy ...

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### Laser beam spot size calculator | Lasercalculator

About this calculator. This calculator computes the. 1 / e 2. 1/e^2 1/e2 spot diameter of a collimated Gaussian beam whose wavelength is. λ. \lambda λ and diameter at lens. D. D D when it is focused with a lens having a focal length. f.

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### How to Calculate Optical Density for Laser Safety Glasses for ...

This is the highest energy per unit of surface area or power of a laser which is safe, as measured at the cornea, assuming a worst-case scenario. ANSI Z136.1 explains how to calculate MPEs. OSHA bases it on the radiation’s wavelength, the pulse duration, the amount of time its beams remains on the retina, and the size of the image that hits ...

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### Laser Safety Eyewear Calculations - Pro-Lite Technology

As a worked example, consider a pulsed Nd:YAG laser that produces 250mJ per pulse at 1064nm at a pulse repetition frequency of 10Hz. The duration of each pulse is 7ns and the accessible beam diameter is 7mm. The first step is to calculate the average power density of the laser. The beam area is pi * [3.5 x 10-3] 2 m 2, which equals 3.85 x 10-5 m 2.

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### Some calculations about laser power, momentum, wavelength ...

The laser power for 445 nm to create the energy of a black hole, for 1 GHz Frequency. GW 6.41 x 10^29 The laser power for 0.0045 nm (Gamma-ray) to create the energy of a black hole, for 1 GHz Frequency. GW 6.48 x 10^24. The emitting spot size of a 10 watt 445 nm laser to generate the mentioned above energy should be uM 1.78 x 10^49 or Km 1.78 x ...

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### Average and Peak Power – A Tutorial - Newport

Assume the energy, E, contained in every pulse is constant. Power is just the time rate of change of the energy flow (energy per unit time). So this leads us to define two different types of power. 1. Definition of peak power: 2. Definition of average power: Rate of energy flow in every pulse. Rate of energy flow averaged over one full

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### How to calculate laser pulse energy - Gentec-EO

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. This is the total amount of energy that you directed ...

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### Laser Energy Density - an overview | ScienceDirect Topics

The laser energy density greatly affected the relative density of the SLM Cu-25.5Zn-4Al-0.6Mn SMAs. That is, the relative density first increased and then decreased as raising the laser energy density. A highest relative density of 96.96% was obtained. 2. The phases in the SLM Cu-25.5Zn-4Al-0.6Mn SMAs were different from that in the raw powders.

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