Depth of penetration of an 850nm wavelength low level laser in human skin.

Low Level Laser Therapy is used for a wide variety of conditions including superficial skin sores, musculoskeletal and joint problems, and dentistry. Knowledge of the penetration depth of laser radiation in human skin is an essential prerequisite to identifying its method of action. Mathematical simulations and estimates from the literature suggest that the depth of penetration of laser radiation using wavelengths from 630nm up to 1100nm may be up to 50mm.

Monitoring the ups and downs of pulsed dye laser energy output.

The internal energy meter reading of a Chromos pulsed dye laser (PDL) set at 50% of maximum pumping energy was recorded at the start of every clinical session over an 898 day period and compared with the measurement from an Ophir Optronics 'Nova' external energy meter. This quick and inexpensive process improved quality control procedures for the use of the PDL and enabled the performance of laser components such as the dye, pumping mechanism and optics to be monitored. The stability of the laser output energy was also monitored during three simulated clinics on days 665, 870 and 898.