Journal of Innovative Optical Health Sciences, 2023, 16 (5): 2241005, Published Online: Sep. 26, 2023
Compact and robust dual-color linearly polarized illumination source for three-photon fluorescence imaging
Three-photon fluorescence imaging illumination source dual-wavelength femtosecond pulse cascaded Raman effect graded-index multimode fiber
Abstract
The miniaturized femtosecond laser in near infrared-II region is the core equipment of three-photon microscopy. In this paper, we design a compact and robust illumination source that emits dual-color linearly polarized light for three-photon microscopy. Based on an all-polarization-maintaining passive mode-locked fiber laser, we shift the center wavelength of the pulses to the 1.7μm band utilizing cascade Raman effect, thereby generate dual-wavelength pulses. To enhance clarity, the two wavelengths are separated through the graded-index multimode fiber. Then we obtain the dual-pulse sequences with 1639.4nm and 1683.7nm wavelengths, 920fs pulse duration, and 23.75MHz pulse repetition rate. The average power of the signal is 53.64mW, corresponding to a single pulse energy of 2.25nJ. This illumination source can be further amplified and compressed for three-photon fluorescence imaging, especially dual-color three-photon fluorescence imaging, making it an ideal option for biomedical applications.
Jiazheng Song, Yanyan Zhang, Yuanshan Liu. Compact and robust dual-color linearly polarized illumination source for three-photon fluorescence imaging[J]. Journal of Innovative Optical Health Sciences, 2023, 16(5): 2241005.