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Note: the better the color of light, its coherent is also possible. the two are unified. the two are unified thinking questions laser was invented laser was invented laser characteristics laser characteristics
Laser Basics 1. Objective A brief history of the 200mW green Laser Pointer, the laser produces a clear principle and characteristics, known hazards of the laser level and the structure of the laser oscillator 2. Laser generation and development history. 2. The circuit control of this green laser pointer is APC circuit.The world's first laser by Maiman American scientists THMaiman) successful research in 1960, this ruby laser as a light-emitting material (bar two silver-plated film formed on the reflector), put out a helical rod krypton gas lamp, in order to take full advantage of krypton light, spiral lamp Maiman and coat in a cylindrical high reflectivity, so that more light shines on Ruby on Krypton. In fact, early in 1916 Einstein had published a paper, we propose a now known as optical sensors and optical absorption induced emission point (also known as stimulated absorption and (emission), this view was actually a 50mW green laser pointer The main theoretical foundation, in 1952, the U.S. launch) Weber State University started Mali Lanna use to enlarge the concept of electromagnetic waves, but the work did not move forward, only the inventor of the laser soup period (C. TOWES) to Weibo Suo to the paper to continue this work, they opened a new field. This green laser pointer is packed by flannel box.Townes's original idea: surrounded by the four mirrors a glass box, the box filled with thallium, putting a thallium light box, with this device can produce 100mW green laser pointer, Townes collaborators Xiao Luo (A.schawlow) specializes in spectroscopy, atomic spectroscopy of two parallel mirrors and optical properties are very familiar with, the idea would be for Townes made two amendments, one he could not produce proof of thallium atom optical amplification, it is recommended to switch to potassium (K actually not easy to produce laser), the second is recommended only two mirrors can be formed of light oscillator, do not follow the closed box as a microwave amplifier resonator.Please keep the green laser pointer far away from where the kids can get. Until now, Townes and Xiao Luo developed out of, but their basic concepts and ideas put forward was recognized as a landmark contribution to the laser field. 2.2 Principle of laser generated by the atomic structure shows that high-speed rotating electron around the nucleus, each with different trajectories Road, which traces Road known as electronic energy levels, at different energy levels. Atomic energy of the system is different because there tends to low levels of particle properties, equilibrium state, low-level particles absorb the energy, the transition to the high energy level, in line with glass and the Boltzmann distribution formula) (Bose and Boltzmann distribution law in line with the formula .)The laser does harm to human eyes, so please don’t point the green laser pointer direct to eyes. If you provide an energy, so that low-level particles absorb the energy, the transition to the high energy level, so that the number of high-energy level than the low-level particle number of particles, this is the so-called "particle aggregation inversion", high-energy particles to lower energy levels spontaneously transition trend, an electronic spontaneous transition, an energy gap emit a photon, called spontaneous emission, spontaneous emission emit photons of frequency proportional to the difference of transition energy, in line with Planck's formula hr = E1-E2, where H = 6.626x10 ^ -34 (JS) is Planck's constant; r is the photon frequency; E2, E1, respectively, for the high-level and low level of energy, the photon and particle excitation energy level E2.
