研究目的
Investigating the tunable three-level Nd:YAG laser using a birefringent filter based on the 4F3/2?4I9/2 transition, focusing on achieving laser emissions at 869, 875, and 878 nm, and demonstrating a continuous-wave simultaneous dual-wavelength Nd:YAG laser at 875 and 878 nm for the first time.
研究成果
The study successfully demonstrated a tunable three-level Nd:YAG laser at 869, 875, and 878 nm, with the latter two wavelengths being reported for the first time. The highest output power of 1.21 W was achieved at 869 nm. A continuous-wave simultaneous dual-wavelength operation at 875 and 878 nm was also achieved, marking a significant advancement in the field of solid-state lasers. The findings suggest potential applications in areas requiring specific wavelength emissions and pave the way for further research with other gain media.
研究不足
The study was limited by the resolution of the available optical spectrum analyzer, which affected the precision of the line width measurements. Additionally, the competitive interaction between the dual wavelengths at 875 and 878 nm could influence the stability and efficiency of the laser output.
1：Experimental Design and Method Selection:
The study utilized a birefringent filter (BF) for wavelength tuning in a Nd:YAG laser setup. The theoretical models included the Füchtbauer–Ladenburg method for calculating emission and absorption cross sections, and the Jones matrix for analyzing the BF's transmittance.
2：Sample Selection and Data Sources:
A
3：5 at. % Nd3+ doped, Φ4 mm×5 mm Nd:
YAG crystal was used, with both sides coated for AR at 809 nm and near 869-880 nm.
4：List of Experimental Equipment and Materials:
The setup included fiber-coupled diode lasers from Coherent Co., USA, with a 200 μm diameter and numerical aperture NA=
5：22, emitting at 809 nm. The coupling optics consisted of two plano-convex lenses with focal lengths of 15 mm. Experimental Procedures and Operational Workflow:
The BF was adjusted to different rotation angles to achieve emissions at 869, 875, and 878 nm. The output power and efficiency were measured at each wavelength.
6：Data Analysis Methods:
The output power versus absorbed pump power was plotted, and the laser spectra were analyzed using an optical spectrum analyzer.
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