About 50% of the doctors want the Continuous Wave lasers. This is not to say one type is better than another. Each type has its own pros and cons. For safety, definitely the Super pulsed lasers. 
Continuous wave (CW) is like a light that is constantly "on"

Many types of lasers can be made to operate in continuous wave mode to satisfy such an application. Many of these lasers actually lase in several longitudinal modes at the same time, and beats between the slightly different optical frequencies of those oscillations will in fact produce amplitude variations on time scales shorter than the round-trip time (the reciprocal of the frequency spacing between modes), typically a few nanoseconds or less.

In most cases these lasers are still termed "continuous wave" as their output power is steady when averaged over any longer time periods, with the very high frequency power variations having little or no impact in the intended application. (However the term is not applied to mode-locked lasers, where the intention is to create very short pulses at the rate of the round-trip time).

For continuous wave operation it is required for the population inversion of the gain medium to be continually replenished by a steady pump source. In some lasing media this is impossible. In some other lasers it would require pumping the laser at a very high continuous power level which would be impractical or destroy the laser by producing excessive heat. Such lasers cannot be run in CW mode.

Note: Some cold lasers are pulsed simply because they cannot be run in continuous mode.
Make sure you know the difference!!!!
Make sure you know the difference!!!!
Make sure you know the difference!!!!

In other cases the application requires the production of pulses having as large an energy as possible. Since the pulse energy is equal to the average power divided by the repetition rate, this goal can sometimes be satisfied by lowering the rate of pulses so that more energy can be built up in between pulses

In laser ablation for example, a small volume of material at the surface of a work piece can be evaporated if it is heated in a very short time, whereas supplying the energy gradually would allow for the heat to be absorbed into the bulk of the piece, never attaining a sufficiently high temperature at a particular point.

There are principally two types of pulsing in lasers
chopped (switched) or super pulsed

A chopped beam is a continuous beam that is electronically (or mechanically) switched between on and off
During the moments when it is on it has typically the same output power as in continuous mode, but as it is not on all the time, the average output power is less than when it is continuous.

False Super Pulsing
One manufacturer claims that its dual-wavelength (800 nm and 970 nm) high-powered Class IV laser has better penetration due to its Intense Super Pulsed emission. However, these diode lasers are not super pulsed, they are chopped?, and chopping does not offer increased penetration. In this case chopping the output simply reduces the tissue-heating effect of the high power laser by both reducing the average power and also allowing time for the tissue to thermally relax (i.e., dissipate heat) between each pulse of light.

There are real super pulsed lasers and there are pulsed lasers because they cant' handle all the power that the laser is rated for. With some of these lasers, just say its a cheap 15 watt lasers, it can only be pulsed so then it takes much longer to treat someone. If it was truly super pulsed it would deliver close to 15 watts and take a very short time. If someone doesn't want to be trained then I strongly recommend a Super pulsed laser.

If you haven't seen my Super pulsed page you can see it here.
If you are looking for help choosing a continuous wave Class IV laser and have questions about the different models on the market let me know. I have compared them all. 

Update: I will not sell lasers that are not FDA cleared. Too many doctors have gotten sued since I started this site. I will let everyone know which lasers are now approved
I will never trash talk lasers that did not get approved or those that were never cleared with the FDA. See my requirements for lasers that are not FDA cleared.
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