研究目的
To develop a compact reliable solid-state laser system operating at 563 nm for medical treatment through selective excitation of deoxyhemoglobin into its long-wavelength absorption peak.
研究成果
The all solid-state compact laser system based on a diode pumped actively Q-switched Nd3+:YVO4 composite laser with intra-cavity second harmonic generation in LBO coupled with the intra-cavity Ba(NO3)2 Raman laser at a wavelength of 563 nm was demonstrated. The peak power of 0.67 kW at 563 nm allows one to use this laser in medical treatment through selective excitation of deoxyhemoglobin into its long-wavelength absorption peak.
研究不足
The efficiency of the conversion of the SH radiation at 532 nm to the first Stokes component at 563 nm was relatively low (15%). The presence of residual pump radiation at 532 nm and the appearance of the second Stokes component at 598 nm were observed.
1：Experimental Design and Method Selection:
The study used an all-solid-state laser system based on a diode-pumped actively Q-switched Nd3+:YVO4 laser with intra-cavity second harmonic generation in LBO followed by intra-cavity Raman conversion in Ba(NO3)
2：Sample Selection and Data Sources:
The gain medium was an a-cut composite Nd3+:YVO4:YVO4 element. The Ba(NO3)2 Raman crystal was used for Raman conversion.
3：List of Experimental Equipment and Materials:
A fiber-coupled diode laser, Nd3+:YVO4:YVO4 composite element, LBO nonlinear crystal, Ba(NO3)2 Raman crystal, and various mirrors and optical coatings were used.
4：Experimental Procedures and Operational Workflow:
The laser system was composed of two coupled cavities for intracavity generation of the SH radiation at 532 nm and Raman conversion to 563 nm.
5：Data Analysis Methods:
The output laser energy was measured with a Coherent Labmaster Ultima Power Meter, and the spectrum was measured with an USB4000-UV–VIS Ocean Optics spectrometer.
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