研究目的
Investigating the laser-stimulated birefringence of Ga2O3 – La2S2.95Se0.05 glasses doped by Er3+ and La3+ ions for optical recording of information.
研究成果
The study demonstrated the ability to vary the refractive indices of Ga2O3 – La2S2.95Se0.05 glasses doped with Er3+ and La3+ ions using femtosecond laser illumination. The laser-stimulated birefringence was found to be sensitive to the ratio of the two coherent photo-inducing beams and the temperature, with the effect being temporary and reversible. The findings suggest potential applications in photonics and optical recording.
研究不足
The study was limited by the photo-thermal destruction of the samples at higher energy densities of the p-polarized light. The anisotropy effect was temporary, diminishing shortly after the laser treatment was switched off.
1：Experimental Design and Method Selection:
The study involved the use of a femtosecond laser to induce birefringence in Ga2O3 – La2S
2：95Se05 glasses doped with Er3+ and La3+ ions. The birefringence was measured using a cw He-Ne laser. Sample Selection and Data Sources:
The glasses were fabricated from Ga2O3 and La2S
3：95Se3, doped with Er and La ions, and prepared in the form of parallelepiped plates. List of Experimental Equipment and Materials:
A 180 fs laser source with a frequency of 65 MHz (λ = 1045 nm), a cw He-Ne laser (λ = 1150 nm), and a set-up for measuring birefringence and grating patterns.
4：Experimental Procedures and Operational Workflow:
The birefringence was measured immediately after laser illumination, with the signal decaying within seconds after the laser was switched off.
5：Data Analysis Methods:
The birefringence was analyzed using a traditional Senarmont scheme, and the grating patterns were monitored by CCD.
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