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与单光子泵浦激光相比,多光子泵浦激光的激发波长位于长波波段,对生物组织的穿透性强、光学损伤小、空间选择性高。具有高偏振度的多光子泵浦激光由于兼具偏振光和多光子泵浦激光的优势因而在医学成像、光动力学治疗等生物光子学领域有着重要的应用前景。然而,由于现有激光增益材料难以同时满足大的多光子吸收截面和激射效率以及高度
Compared with the single-photon pump laser, the excitation wavelength of the multi-photon pump laser is in the long wave band, which has strong penetrability to the biological tissue, small optical damage and high spatial selectivity. Multiphoton-pumped lasers with high polarization have important applications in the field of bio-photonics, such as medical imaging and photodynamic therapy because of the advantages of both polarized and multi-photon pump lasers. However, since the existing laser gain materials are difficult to satisfy both the large multiphoton absorption cross-section and the lasing efficiency and the height