The rated power of 50mW green laser pointer is high

Nonlinear optical crystal, the main purpose is the multiplier effect of the laser to generate the second harmonic. The occurrence of two cases of second harmonic, a frequency doubled laser cavity, an intracavity frequency doubling. Multiplier, is the cavity was first discovered in the international laser SHG experiment shown in Figure 2-11. Franken for the first time in 1966 ruby crystal laser beam incident to the quartz crystal during the experiment found that two beams of the incident light, a bunch of the original incident ruby laser wavelength of 694.3nm; and the other a bunch of second harmonic wavelength of 347.2nm. At that time, the ruby laser frequency doubling efficiency is very low, only 10-8. Figure 2-12 shows the schematic experimental setup of laser intracavity frequency doubling. The rated power of  50mW green laser pointer  is high.
KTP crystal doubled Nd: YAG issued by the infrared laser, resulting in 530nm green, and the efficiency is close to 100%. Figure 2-13 is the second harmonic of another experiment, the use of the nonlinear crystal potassium niobate (KNbO3). 946nm visible laser through a potassium niobate crystal, the multiplier effect 473nm blue laser. The following table lists some of the more commonly used in nonlinear optical crystal, is different in nature. Easy to grow, such as the KDP crystal, the nonlinear coefficient of KTP, light transmission band width of AgGaSe2 crystal CLBO has excellent UV-laser frequency doubling performance. The wattmeter can measure the power of  100mW green laser pointer  easily.Color Option of green laser pointer
However, due to the presence of defects of the silicon single crystal nature of the quantum effects, the development of integrated circuits has reached the limit. The following figure is a semiconductor crystal lattice constant and bandgap. The wider the band gap of semiconductors, the shorter the wavelength of the emission of light waves, commonly used in light-emitting semiconductor such as GaAs, InP. The development of GaN semiconductor band gap width, and can emit blue light, is a hot area in semiconductor research. The third main group nitrides - for short wavelength optoelectronic devices have the potential to the growth of high-quality film is difficult to insert in between the GaN and you'll excuse the substrate temperature deposition buffer layer film. The quality control result is very important to the  200mW green Laser Pointer company.
P-type nitride can control the conductivity of the N-type nitride laser crystal. Simply put, the laser crystal is capable of firing the laser crystal. The earliest use of laser crystals of chromium-doped ruby crystal (Cr: Al2O3), the most used is a neodymium-doped yttrium aluminum garnet (Nd: YAG). Figure 2-6 Schematic diagram of solid-state lasers, mainly by the flash and laser material (greater use of the laser crystal) and the composition of the mirror chamber piece. Reflection mirror surface plating film, a reflecting mirror, another piece of the transmissive mirror, two-lens optical resonator. When the laser crystal by the xenon lamp-pumped, material atoms by photoexcitation to warp in the excited state. Atomic spontaneous radiation, the radiation of light to induce neighboring atoms by Stimulated Emission of Radiation. The  green laser pointer  company can provide the quality assurance of  green laser pointer .
Not perpendicular to the mirror by stimulated emission of radiation through the work material boundary leakage disappeared, only the vertical mirror by stimulated emission of radiation reflector turn back, to re-activate the media and enlarge. Repeated oscillation and ultimately the formation of strong stimulated emission of light, ie laser. Currently the most used laser crystal Al2O3: Cr3 +, of Y3Al5O12: of Nd3 + and YVO 4: Nd3 +. Frequency conversion crystals - a nonlinear optical crystal. Nonlinear crystal with nonlinear optical effect, it will enable the laser wavelength changes. The laser crystal laser wavelength of the radiation is mostly infrared light into visible light through the nonlinear crystal frequency conversion. Nonlinear crystal broadens the laser band, can make the laser more effective applications. Such as infrared laser by the nonlinear crystal multiplier become a green light, green light can be used for underwater communications, CD-ROM storage. The output power of  green laser pointer  is rated. 

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