Broadband tunable operation of compact Yb:CGYA disordered crystal laser
doi: 10.37188/CO.EN-2025-0029
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摘要:
利用直拉法成功合成了具有高光学质量的Yb:CaGd0.33Y0.625AlO4 (Yb:CGYA) 激光晶体。引入的Gd3+离子有助于保持原始结构，并有效诱导Yb3+离子发射光谱的非均匀展宽。Yb:CGYA 晶体的荧光发射峰波长为
1053 nm，对应的半峰全宽为 93 nm。通过使用双折射滤波片实现了从1017 nm至1073 nm的可调谐激光输出，这是迄今为止在短腔中报道的最宽调谐范围。这种紧凑型激光器为其在1 μm波段附近的应用提供了巨大优势。Abstract:A Yb:CaGd0.33Y0.625AlO4 (Yb:CGYA) laser crystal of high optical quality has been successfully synthesized via the Czochralski method. The introduction of Gd3+ ions preserves the original structure and efficiently generates inhomogeneous broadening of the Yb3+ ion emission spectra. The fluorescence emission peak wavelength of the Yb:CGYA crystal is
1053 nm, and the corresponding measured full width at half-maximum is 93 nm. A tunable laser output ranging from1017 nm to1073 nm is achieved by using a birefringent filter, which represents the broadest tuning range reported in a short cavity to date. The compact laser offers great advantages for its applications around 1 μm.-
Key words:
- Yb:CGAY /
- broadband laser /
- disorder crystal
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Figure 1. A photograph of the Yb:CGYA crystal boule, the growth direction is along the [001] axis.
Figure 2. Experimental set-up diagram. (a) Experiment layouts of the Yb:CGYA laser system; (b) Physical drawing of the Yb:CGYA laser system. BF, Birefringent filter; PM, Power meter. OC, output-coupled mirror.
Figure 5. The relationship between the thermal lens focal length and the thermal stability of the simulated laser system.
Figure 6. Laser input-output characteristics of coupled output mirrors with varying transmittances. (a) Output power versus the absorbed pump power; (b) The transmission curve of the M2, M3, and M4 output mirrors within the wavelength range of
1037 nm to1057 nm.
Figure 7. Measured (black line) and fitted (red line) spectral curve of the laser with the T=5.7% OC mirror.
Figure 8. Laser spot measurement. (a) Measurement Device for laser spot profiling; (b) 2-D and 3-D laser beam profiles of the Yb:CGYA laser. F3, planoconvex lens.
Figure 9. Yb:CGYA laser stability testing. (a) T = 5.7% for OC mirror; (b) T = 8.4% for OC mirror.
Figure 11. Polarization measurement of the output laser. (a) Polarization when Toc = 5.7% of OC. (b) Polarization when Toc = 8.4% of OC.
Figure 12. The laser wavelength tuning curve at an absorption pump power of 16.8 W. (a) The transmittance of the output coupler is 5.7%; (b) The transmittance of the output coupler is 8.4%.
Figure 13. Spectra of wavelength-tunable operation of Yb:CGYA laser. (a) single-wavelength operation; (b) multi-wavelength operation.
Table 1. Components and Parameters in the Experimental Setup of the Yb:CGYA Laser
Component Parameter M1 Plano-concave lens, Radius of curvature of 150 mm, Plane coated with anti-reflection film at 980 nm (T>90%),
Spherical coated with high-reflection film at1049 nm (T>99.9%).OC M2: Flat mirror, T=5.7% ( 1049 nm), Reflectance of 96% at 976 nm.
M3: Flat mirror, T=8.4% (1049 nm), Reflectance of 96% at 976 nm.
M4: Flat mirror, T=16.9% (1049 nm), Reflectance of 85% at 976 nm.BF Thickness: 0.05 mm. Filter Long-pass filter, Cut-off wavelength at 1000 nm, transmittance below 0.01% in the range of 900 nm to1000 nm,
and transmittance above 97% in1000 nm to1100 nm.
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