Yb:YAG lasers provide a variety of advantages over diode-pumped rod-based Nd:YAG lasers, including greater beam quality, efficiency, and tunability
Yb:YAG is a quasi-three-level structural crystal with very low thermal permeability, low quantum of loss, and thermal load. It has a maximum output power of 100W at 1030nm, and the output mode is TEM00. Thin-disc Yb:YAG lasers are mostly used in the engraving and printing industries.
Theory
Gain medium - Nd YAG
A thin Yb:YAG disk. The crystal shape of the thin disk laser is a sheet kind. The crystal's cooling efficiency is extraordinarily high since the entire thin disk crystal is connected to the heat sink. Because the laser crystals are so tiny, they only absorb a little amount of the pump light each time it passes past them. To boost pumping efficiency, a parabolic mirror is placed in front of the semiconductor to generate high-power output light.
Heat sink——Used for cooling crystals Thin disk——Made of Yb：YAG Contact material——Contact thin disk with heat sink Pump light——Provide energy Parabolic mirror——Improve pumping efficiency Optical fiber Etalon——Produce single frequency Filter——Tuning wavelength
Feature
· High quantum efficiency
· Low heat transfer efficiency to pump light
· High thermal conductivity
Application
Welding high strength steels
The Yb:YAG laser at 1030nm with energy of 28 kW has exceptionally good beam quality when compared to several other industrial lasers for welding. Yb:YAG is a preferred laser medium for thin disk lasers because of its extended radiative lifetime, high thermal conductivity, and good mechanical properties. According to material absorptivity investigations, disk lasers outperform CO2and Nd:YAG lasers.
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