A laser’s strength is defined as its effect Effect is measured in watts (milliwatt) Energy is measured in Joule Energy is the product of the effect and the treatment time. Energy (Joule) = effect (Watt) * time (seconds)
How many joules do I need for a 100MW laser?
Therefore you must target dosages in the 40 to 100 joules if you are using a 100mW system in order to get a reasonable treatment time. These energy levels are the output from the laser, not the delivered energy to the damaged tissue.
How much energy do you use for laser therapy?
Start with energy dose in table, then reduce by 30% when inflammation is under control Therapeutic dose windows typically range from +/- 50% of given values, and doses outside these windows are inappropriate and should not be considered as Low Level Laser Therapy/ Photobiomudulation Therapy.
How do you calculate the energy of a 500 watt laser?
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 towards this object during this long pulse. Another example: if your 500 W laser has a 200 ms pre-programmed pulse duration, that will give you 500 W * 0.2 s = 100 J of total energy.
What is the total energy of a laser pulse?
This is the total amount of energy that you directed towards this object during this long pulse. Another example: if your 500 W laser has a 200 ms pre-programmed pulse duration, that will give you 500 W * 0.2 s = 100 J of total energy. The total energy can be controlled by modulating the pulse width/duration.
How do you calculate joules for laser therapy?
Real-Life Dosing Example:100 cm2 = 10 cm x 10 cm. Using my treatment area of 100 cm2 and my target dose of 10 J/cm2, I can now calculate my total energy required to dose this condition: ... 1000 J = 10 J/cm2 x 100 cm2 Therefore, to deliver a therapeutic dose, I want to deliver 1,000 joules to the 100 cm2 area.
How do you calculate the energy of a laser?
You can get the Energy (J) by dividing Avg. Power (W) of your Laser with its repetition rate. You can then use Energy and Power to calculate Energy Density = Energy (J)/Area(cm2) and Power Density = Power (W)/Area(cm2).
How is laser Watts calculated?
If you set the control at 1 kHz (1000 pulses every second), then we have 200 W / 1000 Hz = 0.2 J = 200 mJ in each pulse. For a fixed average power, the higher the repetition rate, the lower the energy per pulse.
What does joules mean in laser?
Joule (J) A unit of energy describing the work required to produce one watt of power for one second (one watt-second). Joule cm2 (J cm2) A unit of radiant exposure used in measuring the amount of energy per unit area of absorbing surface or per unit area of a laser beam. Also called the dose.
What is laser output power?
Dec 29, 2020. The technical definition of output power related to laser products is the power level of laser beam. Expressed as less than milliwatt (< MW); a unit of power equal to one thousandth of a watt. Higher output power is brighter than the lower output power.
How do you measure the peak 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 many Joules are in a watt?
Power in general is defined as energy over time. Watts are defined as 1 Watt = 1 Joule per second (1W = 1 J/s) which means that 1 kW = 1000 J/s.
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 do you calculate pulse energy?
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 kind of energy is a laser?
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word "laser" is an acronym for "light amplification by stimulated emission of radiation".
How many times does a laser pulse?
In pulsed and super-pulsed lasers, the beam is turned on and off at a fixed rate (typically around 1000 to 5000 times per second). In sweeping mode the frequency of the pulsing is changed over the period of the treatment.
Why does laser therapy increase the depth of the area?
As treatment depth increases, the target energy at the surface must increase because most of the energy is absorbed on the way to the area where it is needed.
What is cold laser therapy?
In pinpoint therapy, a practitioner will use a narrowly focused beam to treat trigger point or acupoint to correct problems in the body. Because the treatment area is extremely small, the power levels can be very small too. If you will want to do trigger point or acupoint therapy, read this.
Does pulsing a laser help the body?
Based on my experience, pulsing the laser offers an addition benefit in stimulating the body and this benefits more than offsets the the reduction the speed of delivering the photons. For higher power systems, pulsing also has the benefit of allowing higher power levels without the risk of burning.
Is pulsing a laser good?
The general consensus is that pulsing a laser provides an additional benefit beyond the total dosage of energy. Many people get great results with a lower power pulsing system but, at this point, we cannot quantify (put it into numbers) the benefits of pulsing so it is left out of this analysis.
Is a cold laser dangerous?
The answer is cost and fear. The price of the cold laser is a limiting factor for many and safety for others. Unfortunately, "with great power comes great responsibility". Class 4 products by definition are the most dangerous products on the market.
Can you use a high power laser for IR?
Large damaged areas are best treated with higher power laser in the IR range. Deeper injuries require more power to achieve optimum photon density in a reasonable amount of time. Laser technology is evolving so it is now possible to have affordable reliable high-power lasers that were not possible before now.
What is laser treatment?
Laser light treatment is the transfer of energy to the cells. Laser light’s energy penetrates the skin and initiates cell functions. This strengthens the immune system and icrease blood flow.
What is laser therapy?
Laser therapy, as mentioned, is the transfer of energy to the cells and the amount of energy required for stimulation of the cells is directly proportionate to the number of cells stimulated (area x depth). This means that surface structures with a small area require lower doses than deeper lying structures with a greater area.
How does the effect of a laser affect the tissue?
The effect of the laser determines how fast the energy is transferred to the tissue being treated! A weak laser needs to be used for a long time, whereas a more powerful laser transmits the energy faster which significantly shortens the treatment time. The effect of the laser has no influence on the depth of penetration of the tissue, ...
Does laser penetration affect tissue?
The effect of the laser has no influence on the depth of penetration of the tissue, as it is only the wavelength of the laser that determines the depth of penetration. Generally, the more powerful the laser, the more joules are transferred to the tissue thus giving faster treatment results. Lasers with a very high effect however have ...
What is power density in light therapy?
For light therapy at home, power density is therefore the main thing you need to know – if you don’t know it, you won’t be able to know how long to apply your device for to achieve a certain dose. It is simply a measure of how strong the light intensity is (or how many photons are in an area of space).
Why are lasers and LEDs so accurate?
Lasers and LEDs give accurate readings because they only output wavelengths +/-20 of their stated wavelength. ‘Solar’ power meters are obviously intended for measuring sunlight, so not perfectly calibrated for measuring single wavelength LED light – the readings will be a ballpark figure but accurate enough.
Why is there a discrepancy in light therapy?
The most common reason for this discrepancy is a lack of knowledge about dose. To be successful with light therapy, you first need to know how strong your light is (at different distances), and then how long to use it for.
Can you test a laser to see the power density?
You can test any LED or laser to find out the power density at a given point. Full spectrum lights such as incandescents & heat lamps cannot be tested this way unfortunately because much of the output is not in the relevant range for light therapy, so the readings will be inflated.
