Real-time SHG imaging technique based on a 2-GHz repetition rate femtosecond Ti:sapphire laser

Shi-Wei Chu; Tzu-Ming Liu; I-Hsiu Chen; Chi-Kuang Sun; Cheng-Yung Lin; Hsui-Jen Tsai

doi:10.1117/12.478012

10 July 2003 Real-time SHG imaging technique based on a 2-GHz repetition rate femtosecond Ti:sapphire laser

Shi-Wei Chu, Tzu-Ming Liu, I-Hsiu Chen, Chi-Kuang Sun, Cheng-Yung Lin, Hsui-Jen Tsai

Proceedings Volume 4963, Multiphoton Microscopy in the Biomedical Sciences III; (2003) https://doi.org/10.1117/12.478012
Event: Biomedical Optics, 2003, San Jose, CA, United States

Abstract

The problem of weak signal intensity due to the low incident average intensity limited by photodamage probability in common nonlinear light microscopy and spectroscopy can be fundamentally solved by increasing the repetition rate of the excitation light source. Since the possibility of nonlinear photodamage is determined by the incident peak intensity (or pulse energy), increasing the repetition rate of the excitation light source while keeping its peak intensity (or pulse energy) well below than damage threshold will not provoke any optical damage but will augment the average nonlinear signals. We used a femtosecond Ti:sapphire laser with a 2-GHz repetition rate as the light source of a second-harmonic-generation (SHG) microscope and strongly enhanced SHG signal was observed while no photodamage could be identified. Compared with the common 80-MHz Ti:sapphire laser, the microscopic images taken with the 2-GHz laser require shorter acquisition time and exhibit higher contrast, resulting in real-time SHG imaging capability.

Citation Download Citation

Shi-Wei Chu, Tzu-Ming Liu, I-Hsiu Chen, Chi-Kuang Sun, Cheng-Yung Lin, and Hsui-Jen Tsai "Real-time SHG imaging technique based on a 2-GHz repetition rate femtosecond Ti:sapphire laser", Proc. SPIE 4963, Multiphoton Microscopy in the Biomedical Sciences III, (10 July 2003); https://doi.org/10.1117/12.478012

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