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©The Facts of Light SLD’s (Superluminous diodes) generate light covering a broad range of wavelengths, whereas laser diodes are monochromatic and are limited to a single wavelength. Lasers are not Magical “All too often the laser phototherapy literature is written as if a laser is magical. Lasers can seem magical if their unique properties of micro-dot focusing, high intensity, possibility of ultrashort pulses, coherent radiation, and monochromaticity are all made use of. If the first four properties are not useful in a particular application, as is the case for laser phototherapy, then a laser is just an expensive light bulb, whose emitted radiation follows (except for coherence) all of the same laws of physics and chemistry that the same wavelength of radiation from a conventional (non-coherent) light source follows.... Furthermore, there is no significant difference whether the light used to stimulate growth was generated by a laser or from non-coherent light of the same wavelength.... These results further support the conclusion that lasers are not magical; it is the light that they produce that yields the biological effect. It is the wavelength of the light that is important, not the coherence or lack of same.”
–Kendric C. Smith, Ph.D., Professor Emeritus of Radiation Oncology (Radiation Biology), Stanford University School of Medicine, Founder and First President American Society of Photobiology, “Laser (and LED) Therapy is Phototherapy”
Coherent (Laser) vs. Non-Coherent (SLD) Light "In these cases, the coherent and non-coherent light with the same wavelength, intensity and dose provide the same biological response."
–Tiina I. Karu, Ph.D., Professor, Russian Academy of Laser Sciences, “Cellular Mechanisms of Low-Power Laser Therapy: New Questions”
Wavelength Spectrum - SLD vs. Laser Wavelength Determines Depth-of-Penetration Prior to penetrating tissue, laser-generated light maintains unique qualities of collimation and coherence. “ Wavelength determines depth-of-penetration –the longer the wavelength the deeper the penetration. Qualities unique to lasers such as collimation and coherence do not affect depth-of penetration since both are lost once light has penetrated the first millimeter of tissue.” By the time laser-generated light has passed through the first millimeter of tissue, the unique qualities of collimation and coherence are lost. –D.C. Laycock, Ph.D., MIPEM, MBES, CGLI., “Lasers vs. Super Luminescent Light Emitting Diodes”
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