Abstract
We report on the study of single-mode fiber-laser-pumped mode-locked Yb:CALYO lasers via using a passive saturable absorber and Kerr-lens mode-locking technique, respectively. Up to 3.1-W average power with 103-fs pulse duration is obtained from the passive mode-locking, and down to 36-fs pulse duration with more than 2-W average power is achieved by the pure Kerr-lens mode-locking, which is to the best of our knowledge, the highest average power from a reported sub-40-fs Yb-based solid-state oscillator.
Highlights
All-solid-state femtosecond lasers that deliver high peak power and extremely narrow pulse width are of great interest in many fields such as scientific research, industry, medical treatment, and high speed communication
A great number of Yb-doped materials including Yb:CaF2[1, 2], Yb:CALGO[3,4,5], Yb:CALYO[6], Yb:KYW[7], Yb:KGW[8,9,10] and Yb:Lu2O3[11] crystals as well as Yb:LuAG ceramic[12] have shown their capacity in generating sub-100-fs pulses with watt level average power via either pure Kerr-lens mode-locking (KLM) or combination of KLM and saturable absorber-based passive mode-locking
We demonstrated the single-mode fiberlaser-pumped high-power Yb:CALYO lasers passively mode-locked by semiconductor saturable absorption mirror (SESAM) and pure Kerr-lens mode-locking, respectively. 103-fs pulses with up to 3.1-W average power are obtained from passive mode-locking, corresponding to the opticalto-optical efficiency of 31%
Summary
All-solid-state femtosecond lasers that deliver high peak power and extremely narrow pulse width are of great interest in many fields such as scientific research, industry, medical treatment, and high speed communication. Yb-doped calcium aluminate crystals including Yb:CALGO and Yb:CALYO are the most attractive candidates for high-power sub-50-fs pulses generation, due to their flat emission spectra with more than 70 nm bandwidths as well as high thermal conductivity. It is of great interest to generate sub-50-fs pulses with high average power by pumping the Yb:CALGO or Yb:CALYO crystal with a single-mode fiber laser. In 2014, Sevillano et al demonstrated a single-mode fiber-laserpumped pure KLM Yb:CALGO oscillator, delivering 40-fs pulses with 1.1-W average power[3]. Preliminary results of only 250-mW output power and 57-fs pulse duration were generated from a single-mode fiber-laser-pumped Yb:CALYO laser[20], which is far away from the expectation of generating much higher output power with shorter pulse duration considering the good optical and thermal properties of the Yb:CALYO crystal
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