the steady-state particle

Back in the 1960s, Goldman first described ruby laser for hair follicle damaging effects of melanin, but not for clinical, 80 Ohshiro describes nevi after ruby laser hair loss treatment, but also severely damaged skin. In 1993, Wellman Medical Optics Laboratory at Harvard University began the study with the ruby laser hair removal, followed by ruby laser, Nd: YAG laser hair removal in succession for clinical treatment, but they are also less than ideal design parameters. The director is carefully arranging the production preparation of laser pointer .
After a new intense pulsed light hair removal treatment system began to be used, since the optical hair removal technology has matured. Wellman Laboratories Medical in 1997 to start using the optical semiconductor laser hair removal for clinical treatment, and achieved significant efficacy, the early lasers are large, complex operation, the treatment ineffective. Skin causing serious injury. The interaction between light and matter, the material is essentially composed of microscopic particles or photons absorbed, while the situation to change their exercise performance. Micro-particles have a specific set of energy levels (usually is a separation of these levels). Particles at any one time only with a level corresponding to the state (or simply stated as at a certain level on). Interaction with the photon, the particle transition from one energy level to another level, and the corresponding photon absorption or emission. Photon energy values for this two-level energy difference △ E, frequency = △ E / h (h is Planck's constant). The workshop is going to summarize the analysis data of laser pointer . Turnover of laser pointer in This Month. The new research and development center of laser pointer can accommodate 100 hundred people. At a low level of particles by the external excitation (that is, particles with other energy exchange occurred in the interaction, such as inelastic collisions with the photons), absorbed energy, and this transition to higher energy corresponding to level. This transition is called stimulated absorption. Particles are excited to enter the high-energy state, not the steady-state particle, the particle can be accepted if there is a lower level, even if there is no external effect, the particle has some probability of spontaneously from the high energy level (E2) to the low level ( E1) transition, while radiating energy (E2-E1) photon, the photon frequency = (E2-E1) / h. This process is called spontaneous emission of radiation.