Nd: YAG crystal
Nd: YAG crystal is currently the most excellent comprehensive performance of the laser crystal. With a laser wavelength of 1064nm, it is widely used in military, industrial and medical industries. Can provide F1-20(D) ´ 10-140(L)mm laser rods and a variety of slat components, Nd concentration of 0.6 ~ 1.1at.%.
2, Ce: Nd: YAG crystal
For flash lamp pumped laser, the pump lamp emission spectrum is actually a broadband continuum, only a few spectral peaks and Nd ion absorption peaks match, so the general lamp pumping only utilizes a very small portion of the spectral energy, the efficiency of the lower. The addition of Ce ions to form Ce:Nd:YAG on the basis of Nd:YAG crystals is to take advantage of the fact that Ce ions can absorb the photon energy in the UV spectral region very well and transfer the energy to the Nd ions in a manner without radiative leaps, thus increasing the utilization of the spectrum, and therefore the laser bar has a high efficiency, a low threshold, and a good repetitive frequency characteristic. In addition, it will be harmful to the Nd: YAG UV radiation (long time UV radiation, will form a color center in the Nd: YAG crystal, thus reducing the laser performance of the crystal) for effective use, so anti-UV radiation, and even can not use special UV filtering quartz casing. Ce: Nd: YAG because of Ce doped crystals after the crystal is yellow, so it is also known as the yellow bar. Can provide a variety of slat components and F1-20 (D) & acute; 10-140 (L) mm laser rod, Nd concentration of 0.6 ~ 1.1at.%, Ce concentration of 0.03 ~ 0.4at.%.
3, Yb: YAG crystal
Yb: YAG is trivalent ytterbium ions (Yb3+) doped into yttrium aluminum garnet (YAG) matrix formed by a laser crystal to produce 1.03um near-infrared laser light, which belongs to the same kind of matrix with Nd: YAG, but due to the doping of different growth processes. Ytterbium-doped YAG has a long fluorescence lifetime (0.91ms) due to its high quantum efficiency (91%), simple crystal spectrum, no excited state absorption and up-conversion and no fluorescence concentration burst, high doping concentration (up to 30at.% or more), and much wider absorption bandwidth (18nm) than that of Nd:YAG (<4nm), which can be efficiently coupled with the diode's pump wavelength. Under the same input power, the heat generation of Yb:YAG pumping is only 1/4 of Nd:YAG. Moreover, the physical and chemical properties of YAG substrate are the most excellent, so Yb:YAG has become one of the most compelling solid-state laser media, and LD-pumped high-power Yb:YAG solid-state lasers have become a new hot spot for research and are regarded as a major direction for the development of high-efficiency, high-power solid-state lasers. main direction.
Laser rods play a very important role in all laser devices. Whether in industrial laser equipment or medical laser equipment or military laser equipment. All play a very important role.