We present a nonlinear ytterbium-doped fiber amplifier based on enhanced nonlinear effects that can produce a flat broadband spectrum ranging from 1050–1225 nm with a maximum average output power of 7.8 W at 14 W pum...We present a nonlinear ytterbium-doped fiber amplifier based on enhanced nonlinear effects that can produce a flat broadband spectrum ranging from 1050–1225 nm with a maximum average output power of 7.8 W at 14 W pump power.Its repetition rate is 89 MHz. Using a pair of gratings and two knife edges as a filter, wavelength tunable picosecond pulses of tens to hundreds of milliwatts can be obtained in the broadband spectrum range. The output power, pulse width, and spectrum（center wavelength and linewidth） are adjusted by tuning the distance of the grating pair and/or the knife edges.Fixing the distance between the two gratings at 15 mm and keeping the output spectrum linewidth at approximately 20 nm,the shortest pulse width obtained is less than 1 ps centered at 1080 nm. The longest wavelength of the short pulses is around1200 nm, and its output power and pulse width are 40 m W and 5.79 ps, respectively. The generation of a flat broadband spectrum is also discussed in this paper.展开更多
We demonstrate a self-started,long-term stable polarization-maintaining mode-locked fiber laser based on the nonlinear polarization evolution technique.A polarized beam splitter is inserted into the cavity of the line...We demonstrate a self-started,long-term stable polarization-maintaining mode-locked fiber laser based on the nonlinear polarization evolution technique.A polarized beam splitter is inserted into the cavity of the linear polarizationmaintaining fiber laser to facilitate self-started mode-locking.Pulses with single pulse energy of 26.9 nJ and average output power of 73.9 mW are obtained at the pump power of 600 mW.The transmission characteristics of artificial saturable absorber used in this laser are analyzed theoretically,the influence of the half-wave plate state on mode-locking is discussed,and the mode-locking range is obtained,which is well consistent with the experimental results.展开更多
We report the first self-Q-switched Yb-doped GdYSiO5（Yb：GYSO） laser operating at 1080 nm.Stable Q-switched pulses with a repetition rate of 18.1 k Hz and pulse duration of 9.45 μs are obtained.A maximum average ou...We report the first self-Q-switched Yb-doped GdYSiO5（Yb：GYSO） laser operating at 1080 nm.Stable Q-switched pulses with a repetition rate of 18.1 k Hz and pulse duration of 9.45 μs are obtained.A maximum average output power of452.6 m W is achieved with a 1% transmission output coupler.With a 3% transmission output coupler,the shortest pulse width of 6.6 μs is obtained.It demonstrates that Yb：GYSO crystal can be simultaneously employed as a saturable absorber and a gain medium to generate microsecond Q-switched pulses in the near infrared region.展开更多
基金supported by the National Basic Research Program of China(Grant No.2013CB922404)the National Scientific Research Project of China(Grant No.61177047)the National Natural Science Foundation of China(Grant No.61575011)
文摘We present a nonlinear ytterbium-doped fiber amplifier based on enhanced nonlinear effects that can produce a flat broadband spectrum ranging from 1050–1225 nm with a maximum average output power of 7.8 W at 14 W pump power.Its repetition rate is 89 MHz. Using a pair of gratings and two knife edges as a filter, wavelength tunable picosecond pulses of tens to hundreds of milliwatts can be obtained in the broadband spectrum range. The output power, pulse width, and spectrum（center wavelength and linewidth） are adjusted by tuning the distance of the grating pair and/or the knife edges.Fixing the distance between the two gratings at 15 mm and keeping the output spectrum linewidth at approximately 20 nm,the shortest pulse width obtained is less than 1 ps centered at 1080 nm. The longest wavelength of the short pulses is around1200 nm, and its output power and pulse width are 40 m W and 5.79 ps, respectively. The generation of a flat broadband spectrum is also discussed in this paper.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61575011 and 61975003)the Beijing Natural Science Foundation,China(Grant No.4192015).
文摘We demonstrate a self-started,long-term stable polarization-maintaining mode-locked fiber laser based on the nonlinear polarization evolution technique.A polarized beam splitter is inserted into the cavity of the linear polarizationmaintaining fiber laser to facilitate self-started mode-locking.Pulses with single pulse energy of 26.9 nJ and average output power of 73.9 mW are obtained at the pump power of 600 mW.The transmission characteristics of artificial saturable absorber used in this laser are analyzed theoretically,the influence of the half-wave plate state on mode-locking is discussed,and the mode-locking range is obtained,which is well consistent with the experimental results.
基金Project supported by the National Natural Science Foundation of China(Grant No.61575011)the Beijing Municipal Natural Science Foundation,China(Grant No.1102005)
文摘We report the first self-Q-switched Yb-doped GdYSiO5（Yb：GYSO） laser operating at 1080 nm.Stable Q-switched pulses with a repetition rate of 18.1 k Hz and pulse duration of 9.45 μs are obtained.A maximum average output power of452.6 m W is achieved with a 1% transmission output coupler.With a 3% transmission output coupler,the shortest pulse width of 6.6 μs is obtained.It demonstrates that Yb：GYSO crystal can be simultaneously employed as a saturable absorber and a gain medium to generate microsecond Q-switched pulses in the near infrared region.
