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Laser cutting machine laser rod how to choose?
The laser rod is a solid, mainly composed of yttrium aluminum garnet crystals, which can be divided into Nd:YAG crystals, Ce:Nd:YAG crystals, Yb:YAG crystals, and the like. Laser bars used in laser marking machines, laser cutting machines, and other industrial laser equipment are generally ND:YAG crystals.
1. The tunable laser rod, according to the transition metal ion dd transition susceptible to the influence of the lattice field, in a certain range, so that the laser wavelength can be tuned. Currently the best tunable laser crystals doped with Cr3+ are Cr3+:LiCaAlF6 and Cr3+:LiSrAlF6 with a tuning range of 0.78-1.01um. Among these two kinds of crystals, the former has good mechanical properties and the latter has good laser performance.
2. New-wavelength laser rods, mid-infrared crystals with wavelengths of 2 to 3 μm, such as Er1.5Y1.5Al5O12 (2.94 μm), due to the absorption coefficient of water at this wavelength of 1 (only 1.0–4 compared to 1.06 um), therefore 3 μm Lasers are widely used in medicine. (China Cutting Machine Trading Network)
3. Semiconductor lasers and small-laser laser crystals, semiconductor superlattices, quantum well materials An important application in photoelectron technology is the fabrication of semiconductor quantum well lasers (QWLD). QWLD is widely used because of its advantages of high efficiency (60%), small size, reliability, and excellent cost-effectiveness.
4. High average power density laser bars, lasers used in industrial processing are mainly CO2 lasers and Nd:YAG lasers. Due to the use of high-power semiconductor lasers as pumping sources, a multi-rod series combination system is adopted in the structure, making The Nd:YAG laser output has a high average power density of kilowatts.
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