钒酸盐晶体拉曼及其混频可见光波段激光研究进展

Research Progress of Raman and FrequencyMixingfor Visible Lasers Based on Vanadate Crystals

受激拉曼散射是获得新型波长激光的重要变频手段。腔内拉曼激光同时存在着基频光和多阶斯托克斯光,为通过二阶非线性光学变频获得多种可见光波长激光提供了基础,可满足一些领域对多种波长激光的应用需求,在激光医疗、激光显示、光谱成像和生物光子学等领域具有重要应用。钒酸盐晶体具有优异的受激拉曼散射特性,是钕离子激光驱动的重要固体拉曼增益介质。简要介绍了钒酸盐晶体拉曼光谱特性以及相关拉曼激光研究现状,随后对近年来拉曼倍频与和频激光的研究进展进行了总结,并对基于拉曼选择性混频实现可见光波段可选激光技术的发展及应用前景作了简要分析。

Stimulated Raman scattering is an important frequency conversion method for obtaining novel wavelength laser.For an intracavity Raman laser,the fundamental light and multi-Stokes light simultaneously resonating in the laser cavity provide the possibility for outputting multi-wavelength visible laser by second-order nonlinear optical frequency conversion,which can meet the application needs for multiple wavelength laser in some fields,such as laser medical treatment,laser display,spectral imaging,and biophotonics.Vanadate crystal is an important solid Raman gain medium driven by Nd-ion laser for its excellent stimulated Raman scattering properties.In this paper,the Raman spectral characteristics of vanadate crystals and the research status of related Raman laser are briefly introduced.Then,the research progress of second harmonic and sum-frequency generation of Raman laser in recent years is summarized,and the development and application prospects of techiques for generating multiple wavelengthswitchable visible laser by Raman selective frequency mixing are briefly analyzed.