A comparison of two 810 diode lasers for hair removal: Low fluence, multiple pass versus a high fluence, single pass technique

Abstract

This data supports the hypothesis that using diode lasers at low fluences and high average power with a multiple pass in-motion technique is an effective method for hair removal, with less pain and discomfort, while maintaining good efficacy. The 6 month results were maintained at 12 month for both devices.

Static and dynamic modes of 810 nm diode laser hair removal compared: A clinical and histological study

“…The static mode was used on one of each subject's legs, whereas the contralateral leg was treated with the dynamic mode which has been reported to enable swifter hair removal over larger treatment areas, such as the entire leg or back with good efficacy and potentially less pain. 6,7) In the present study, the parameters used at a wavelength of 810 nm and a 20 mm x 10 mm treatment area per shot were a 30 J/cm 2 energy density and a 55 msec pulsewidth for the static mode at a repetition rate of 1 Hz, and an energy density of 10 J/cm 2 and pulsewidth of 20 msec for the dynamic mode at a pulse rate of 10 Hz. Coupled with the to and fro motion used with the continuous handpiece over the tissue, this allows a relatively high energy density of 100 J/cm² over a 100 cm² treatment area: that represents 10 Kj total energy delivered over the 100 cm² area, allowing for efficient hair removal.…”

“…Some other devices, including the one used in the present study, [5][6][7] deliver the laser energy with the handpiece in constant contact and continuous motion over the treatment area, referred to as the dynamic mode, compared with the conventional 'stamping', or static, mode. The dynamic mode can potentially cover a larger area in less time with less 'skipping' of untreated areas, and possibly with less pain.…”

Novel 755-nm diode laser vs. conventional 755-nm scanned alexandrite laser: Side-by-side comparison pilot study for thorax and axillary hair removal

“…Recently the application of low fluencies at high average power with a multiple pass inmotion technique using 810 nm diode lasers has been shown to decrease the pain, and discomfort while keeping a good efficacy over 12 month [6][7][8][9]. Lately, high power laser diodes emitting at 755 nm are at hand and have made their way instantly into a new laser system.…”

“…Perifollicular edema and erythema were also documented by the Dermoscope system. Pain, perifollicular edema, and erythema were quantified by the physician using visual analog scales (1)(2)(3)(4)(5)(6)(7)(8)(9)(10).…”

“…type of cooling, the problems of fragile transmission systems and bulky scanner do play a role. Finally, the concept of using low fluencies at high average power with a multiple pass in-motion technique has been introduced for the 810 nm diode lasers leading to a dramatic decrease in therapy related pain, less discomfort and good efficacy over 12 month [6][7][8][9].…”