Abstract:We report an oblique incidence on semiconductor saturable absorber mirror (SESAM) method in the LD pumped passively mode-locked Nd:YVO 4 picosecond laser in this article, making SESAM as the intracavity reflecting mirror, which produces maximum average output power of 1 W, pulse repetition rate of 120 MHz, and stable continuous mode-locked pulse at 1064 nm with the pulse width of 19.2 ps. To our knowledge, this was the first demonstration that got CW mode-locking in standing-wave laser with a reflected mirror SESAM in oblique incidence way.Setup of the passive mode-locked oscillator using SESAM as inclined mirror
We report the high peak power picosecond hybrid fiber and solid-state laser amplifier system. The passively mode-locked solid-state seed source produced an average power of 1.8 W with pulse width of 14 ps and repetition rate of 86 MHz. It was directly coupled into the first Yb-doped polarized photonic crystal fiber amplifier stage. To avoid the nonlinear effects in fiber, the output power from the first stage was merely amplified to 24 W with the narrow spectra broadening of 0.21 nm. For the improvement of the peak power, the dual-end pumped composite Nd:YVO4 amplifier system has been chosen at the second stage. To reduce the serious thermal effect, the thermally bonded composite YVO4 – Nd:YVO4 – YVO4 rod crystal was used as the gain medium. The 53 W TEM00 mode with the peak power of 40 kW, beam quality of M2 < 1.15, corresponding to the optical-optical efficiency of 42.4% was obtained at the hybrid amplifier laser system. The system allows using a low power seed source and demonstrates an increase in the peak power beyond a fiber master oscillator power amplifier's (MOPA's) limit.
Within the family of carbon nanotubes, multi-walled carbon nanotube material has the advantages of low-cost and high laser damage threshold. Therefore, in principle, it is more suitable for high power laser applications. In this letter, a high power continuous wave mode-locking Nd:YVO4 laser using a multi-walled carbon nanotube absorber has been successfully demonstrated. An average output power as high as 1.4 W has been achieved with a slope efficiency of 24%. The repetition rate and pulse width of the mode-locked laser were 68 MHz and 15.5 ps, respectively. The calculated pulse energy and peak power were 20.6 nJ and 1.33 kW, respectively.
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