垂直外腔面发射有机染料薄膜可见激光OA

[Background]Visible lasers in the 560-600 nm band are widely used in vascular disease treatment.Conventional solid-state lasers for this band feature complex systems and high costs,which limit their application in low-resource medical scenarios.Organic solid-state dye lasers offer low-cost solution processing and wide spectral tunability,making them promising alternatives for disposable medical light sources.[Purpose]This study aims to develop a simple,low-cost,and easily replaceable vertical external-cavity surface-emitting laser based on an organic dye-doped polymer film,and to evaluate its lasing performance under nanosecond and femtosecond pumping conditions.[Methods]A Rhodamine 6G-doped poly(methyl methacrylate)(Rh6G-PMMA)gain film was fabricated via solution casting,and the gain film was physically placed inside a planar-planar external cavity formed by a dichroic input mirror and a broadband high reflector.Lasing characteristics,including threshold,spectral linewidth,output stability and operational lifetime,were measured under 532 nm nanosecond and 515 nm femtosecond pumping.[Results]The device achieved stable laser output at a central wavelength of approximately 562 nm under both pumping schemes.The lasing thresholds were 2.12 mJ/cm2 and 4.93 mJ/cm2 for nanosecond and femtosecond pumping,respectively,with the full width at half maximum(FWHM)of the output spectrum narrowing to 4.7 nm and 2.2 nm.Under femtosecond pumping at 6.09 mJ/cm2,the device could operate stably for over 2 300 laser pulses.[Conclusions]The vertical external-cavity surface-emitting organic dye film laser features a very simple structure,low fabrication cost,and a physically separable gain film that can be quickly replaced after performance degradation.These characteristics make it a promising candidate for low-cost,disposable gain modules in biomedical applications such as vascular lesion treatment.