What light sources (lasers, LEDs) can be used?
The field of photobiomodulation is characterized by variety of methodologies and use of various light sources (lasers, LED’s) with different parameters (wavelength, output power, continuous wave or pulsed operation modes, pulse parameters). These parameters are usually given in manufacturers manuals. The GaAlAs diodes are used both in diode lasers and LED’s, the difference is whether the device contains the resonator (as the laser does) or not (LED). In latter years, longer wavelengths (-800-900 nm) and higher output powers (to 100 mW) are preferred in therapeutic devices. Should a medical doctor use a laser or a diode? The answer is – it depends on what one irradiates, in other words, how deep tissue layers must be irradiated. By light interaction with a biotissue, coherent properties of laser light are not manifested at the molecular level. The absorption of low-intensity laser light by biological systems is of a purely noncoherent (i.e., photobiological) nature. On the cellular leve
