研究目的
Investigating the mechanism of absorption and restoration of radiation transmission in the channel of small-scale self-focusing of a short laser pulse in neodymium glass.
研究成果
The absorption jump in neodymium glasses is due to the fast population of the 4I11/2 level of Nd3+ ions during nonlinear processes in the SSSF channel. The relaxation time of the population and the restoration of transmission are determined by the characteristic sizes of the excitation regions and the thermophysical characteristics of the glasses. This effect complements the understanding of physical processes in high-power neodymium lasers and may also occur in other solid-state laser media.
研究不足
The study was limited to neodymium glasses and did not explore other solid-state laser media. The spectral range of detection was limited by the sensitivity of the film, and detailed spectral-angular scattering characteristics were not studied.
1：Experimental Design and Method Selection:
The experiment involved diagnosing a small-scale self-focusing (SSSF) channel of a 0.5-ns laser pulse in neodymium glasses using probe pulses at wavelengths of 1.06 and 0.66 μ m. The setup included a high-power laser pulse (HPLP) system, glass samples, and diagnostic equipment like an Agat-SF-3 streak camera.
2：5-ns laser pulse in neodymium glasses using probe pulses at wavelengths of 06 and 66 μ m. The setup included a high-power laser pulse (HPLP) system, glass samples, and diagnostic equipment like an Agat-SF-3 streak camera.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Phosphate and silicate neodymium glass samples were used, with lengths ranging from 7 to 26 cm. The HPLP was relayed into the samples with a beam diameter of ≈2 mm.
3：List of Experimental Equipment and Materials:
The setup included a collimator, aperture, calorimeters, photocell, and Agat-SF-3 streak camera. The glass samples were of types KNFS, LGS-55, GLS-23P, GLS-1, and GLS-
4：Experimental Procedures and Operational Workflow:
The HPLP was sent into the glass samples, and the propagation channel was illuminated with probe pulses at an angle of 3°–5°. The induced absorption was determined by changes in the probe pulse profile at the streak camera.
5：5°. The induced absorption was determined by changes in the probe pulse profile at the streak camera.
Data Analysis Methods:
5. Data Analysis Methods: The induced absorption was analyzed based on the changes in the probe pulse profile, and the relaxation time of the induced absorption was measured.
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