How is laser average power calculated?

How is laser average power calculated?

A simple way to think of the average power is just the peak power times the duty factor. In other words, you’re averaging the power over the course of one on/off cycle of the laser. So, if for example, your laser is 10 kW, and it pulses for 1 ns at 1 kHz (in other words, its duty cycle is 1/1,000,000 or 0.0001%).

How do you measure the power of a pulsed laser?

(time duration) = (area under trace) / ( peak power A.U.) i.e. (time duration) = (26.8 ms)/55 = 0.49 ms. Thus, for instance if the total pulse energy is 10 mJ, the peak power is 10 mJ divided by 0.49 ms, approximately 20.5 W.

How do you calculate pulse power?

Pulse Energy from Average Power and Repetition Rate For regular pulse trains with high repetition rate, the (usually low) pulse energy is often calculated by dividing the average power (measured e.g. with a power meter) by the pulse repetition rate.

What is the average power of laser?

Since the laser is off a million times as much as it’s on, the effective average power is one millionth of the peak power, or 10 mW. Figure 1 – A simple diagram of average power and peak power, where the peak power is 10 W, the duty factor is 20% and the average power is 2 W.

What is laser duty cycle?

Duty Cycle Range (A percentage of laser on time) • Duty cycle is the percent of laser on time in a given command signal. (e.g.: 50% duty cycle means the laser is firing half the cycle time and off the other half). • CW lasers are assumed to have a duty cycle range up to 100%, or continuously on.

How do you calculate the energy output of a laser?

E = PPEAK x t. For example, an Excimer laser might have a 10 ns pulse width, energy of 10 mJ per pulse, and operates at a repetition rate of 10 pulses per second. This laser has a peak power of: PPEAK = 10 mJ / 10 ns = 1 MW, and average power of: PAVG = 10 mJ x 10 (1/s) = 100 mW.

What is the duty cycle of a laser?

Duty Cycle Range (A percentage of laser on time) • Duty cycle is the percent of laser on time in a given command signal. (e.g.: 50% duty cycle means the laser is firing half the cycle time and off the other half). CW lasers are assumed to have a duty cycle range up to 100%, or continuously on.

What is laser pulse duration?

One of four parameters that can improve the safety and effectiveness of laser hair removal treatments, pulse duration, which is also frequently called pulse width, refers to the time a device takes to deliver energy to a treatment area, or the time in which targeted tissue is exposed to laser energy.

How is duty cycle power calculated?

PW/T = 1/10 = 0.1 (10%). A more typical case would be a PRF of 1,000 and a pulse width of 1.0 microseconds. Using [4], the duty cycle is 0.000001 x 1,000 = 0.001. The RF power is present one-thousandth of the time and the average power is 0.001 times the peak power.

How do you calculate the power density of a 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.

How much power does a laser pulse produce?

Pulsed laser: Pulse Energy (Joules) = Average Power (Watts) / Repetition Rate (Hertz) Let’s put some real values in there and assume that you are working with a laser that has a fixed 200 W output and a repetition rate that can be tuned from 20 Hz to 1 kHz. If you set the control at 20 Hz, we have 200 W / 20 Hz = 10 J per pulse.

How to measure average power of laser?

For example, a Gentec-EO laser power meter can be used to measure average power. Pulsed laser: Pulse Energy (Joules) = Average Power (Watts) / Repetition Rate (Hertz)

What is the peak power of a laser?

From this equation, the peak power is dependent upon the pulse width. For a given pulse energy it applies that theshorter the pulse width the greater the peak power. For most diode lasers, the pulse widths can range from nanoseconds (109seconds) to picoseconds (1012seconds). The amount of energy released is very small, ranging from few nanojoules

What is the energy of a 10 watt 445 nm laser?

We can conclude that a 10 watt 445 nm laser will carry energy as a 20 watt 890 nm laser. That is why diode lasers with the 445 nm wavelength are more efficient than infrared lasers. CO2 lasers typically emit at a wavelength of 10.6 μm, but there are other lines in the region of 9–11 μm (particularly at 9.6 μm).