Abstract
Femtosecond lasers made of Ti:sapphire crystals(Ti:S) with broad gain bandwidths have become key technologies in a wide variety of applications, such as two-photon microscopy, coherent Raman scattering microscopy, optical coherence tomography, and so on. Despite such extensive use, Ti:S femtosecond lasers are predominantly pumped using frequency-doubled diode-pumped solid-state lasers (DPSSLs) with high beam quality. however, such pump lasers are expensive, highly complex, and bulky. Thus, there is a limit to their wider use.
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