Nano Lasers Are Widely Used In Green Laser Pointers
Nano laser refers to the use of green laser pointer nanomaterials such as nanowires as the resonant cavity. A micro / nano device capable of emitting laser light under optical or electrical excitation. With the development of nanotechnology and nanophotonics, the application prospects of compact and miniaturized lasers are attracting attention. When the size of the laser cavity is reduced to the emission wavelength, more interesting physical effects will occur in the electromagnetic cavity. Therefore, ultra-fast coherent light sources with low dimensions and low pumping thresholds are being developed. And nano-optical integration and plasmon green laser pointer. It is important to reduce the three-dimensional size of semiconductor lasers.
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With the advancement of science and technology in human society. The development of the green laser pointer itself has never stopped. "Science" published "Room Temperature Ultraviolet Radiation Nanolaser" of American University, claiming to be the smallest laser in the world. At that time, they first plated gold with a thickness of 1 to 3.5 micrometers on a sapphire substrate, then placed them in an aluminum evaporation dish, and heated the material and the substrate to 880 to 905 degrees Celsius in argon to generate Zn vapor. After the Zn vapor is transferred to the substrate, after about 2 to 10 minutes, the nanowire with a hexagonal cross section can grow to 2 to 10 microns. Nanowires with a diameter of 20 to 150 nm naturally form a laser cavity. The nanowire sample with a hexagonal cross section at room temperature was pumped with a fourth harmonic laser of a Nd: YAG laser (wavelength 266nm, pulse width 3ns). The pumped laser beam was focused on the nanowire at an angle of 10 degrees On the axis of symmetry. Thus. The green laser pointer light emitted by the stimulated radiation converges on the end surface of the nanowire along the direction of the nanowire's central sleeve.
2019-12-26 11:54:29
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