Help 1064 nm emitted from different sources of devices

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Discussion Overview

The discussion centers on the differences between 1064 nm light emitted from Long-Pulsed Diode laser devices and Long-Pulsed Nd:YAG laser devices in the context of hair removal. Participants explore the implications of having identical fluences, pulse durations, and spot sizes on the properties, efficacy, and side effects of the emitted light.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions whether the properties, efficacy, and side effects of 1064-nm light should be the same across different laser sources if fluences, pulse durations, and spot sizes are identical.
  • Another participant suggests that neglecting coherence properties, the two lasers should exhibit similar energy per pulse and not show appreciable differences in their interaction with matter.
  • A different participant emphasizes that while laser fluence relates to energy delivered, the intensity of light over time may not be the same, questioning the assumption of equivalence in light intensity.
  • This participant also inquires about the FDA approval status of devices using each light source and the existence of clinical studies comparing their effectiveness.
  • A later reply indicates an intention to gather more information from manufacturers regarding the devices.

Areas of Agreement / Disagreement

Participants express differing views on whether the properties and effects of the emitted light can be considered equivalent under the stated conditions. The discussion remains unresolved, with no consensus reached on the matter.

Contextual Notes

There are limitations regarding assumptions about light intensity versus time and the lack of data on clinical studies comparing the two laser types.

live-in-upwey
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Are there any differences between 1064 nm emitted by Long-Pulsed Diode laser device and 1064 nm emitted by Long-Pulsed Nd:YAG laser device for hair removal?

Assume that fluences, pulse durations & spot sizes of both devices are exactly the same, should the property, efficacy and side effects of the 1064-nm light be the same no matter what sources it comes from? Shouldn't it?
 
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Neglecting their coherence property, given the condition you assume then the two lasers should have the same energy per pulse. I expect they won't exhibit appreciable difference in the way they interact with matter.
 
live-in-upwey said:
Are there any differences between 1064 nm emitted by Long-Pulsed Diode laser device and 1064 nm emitted by Long-Pulsed Nd:YAG laser device for hair removal?

Assume that fluences, pulse durations & spot sizes of both devices are exactly the same, should the property, efficacy and side effects of the 1064-nm light be the same no matter what sources it comes from? Shouldn't it?
Welcome to the PF. :smile:

Laser fluence is related to the overall amount of energy delivered by the pulse. I don't think you can assume that the light intensity versus time is the same just because the fluences are the same. Do you have any data showing the laser light flux versus time for each of those pulse sources?

https://www.rp-photonics.com/fluence.html

Has the FDA approved devices that use each of those light sources? Are there any clinical studies comparing their effectiveness to each other?
 
I'll try to get the info from the manufacturers. Thank you for your info, very much appreciated.
 

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