Generation of a 59 fs pulse with a 550 nm spectral range in a mode-locked Er-doped single-mode fiber laser system

Abstract

We demonstrated a compact broad spectrum ultrashort fiber laser system that employed a similariton laser as a seed and fiber-optic nonlinearities in an erbium-doped fiber amplifier to broaden the optical spectrum. The system generated a stable 59 fs ultrashort pulse with a spectral bandwidth beyond 550 nm (i.e. 1490–2030 nm). The mode-locked oscillator produced an 85.9 fs similariton pulse at the wavelength of 1553 nm. The maximum average output power of the laser system was 251 mW. This new type of standard single-mode fiber-format energetic ultrashort system was suitable as a source for biological tissue imaging, broad-band spectroscopy, and optical frequency combs.

High-efficiency broadband second-harmonic-generation of YCa4O(BO3)3 crystal

“…Nowadays, people are still striving to pursue ultra-strong and ultrafast lasers in various wavebands. [29][30][31] Combined with erbium-doped fiber laser, YCOB crystal is hopeful to achieve high-power, wide-spectrum femtosecond laser output at around 800 nm, and be developed as a compact, low-cost, powerful competitor of present Ti:Sapphire ultrafast laser sources. More than this, YCOB has the potential to generate extremely ultrashort (<10 fs) laser pulses, to meet the needs of many cutting-edge applications in biomedicine, scientific research and other fields.…”