An Overview on Low-Level Laser Therapy (LLLT) & Cooling Laser Therapy (C.L.T.) in Medical Engineering

Some essential methods for overcoming the skin problem during laser therapy are Low-Level Laser Therapy and Cooling Laser Therapy in cooling the most superficial layers of the skin. Although melanin absorption will result in heat production during laser exposure, cooling the epidermis can prevent its temperature elevation from exceeding the threshold for thermal injury. L.D.C. is a technique for laser cooling of small particles. Low-Level Laser Therapy (LLLT), consisting of Low-intensity radiation in specific wavelengths, has been discussed to trigger cellular proliferation and differentiation through molecular mechanic mechanisms. This work studied the propagation of the laser beam into biological tissue such as the brain and skin by the Monte Carlo method. What is generally accepted is that the energy density required is very small, and the transmit power is less than 0.6 Watts

Temperature measurements of optically cooled calcium atoms using differential two-photon spectroscopy

A differential two-photon method of measuring the temperature of 40Ca atoms in a continuously operating magneto-optical trap is demonstrated. Coherent two-photon resonances at the 4s2 1S0-50 1S0 Rydberg transition have been investigated experimentally using resonance laser beams propagating at different angles. The tempera­ture of the cloud of 40Ca atoms was measured depending on the frequency detuning of the cooling laser radiation.