Abstract
A new type of diffusion-bonded Nd:YVO4/Nd:GdVO4 hetero-composite crystal is originally designed and applied to diode-end-pumped laser for achieving an efficient dual-comb picosecond operation with self-mode locking for the first time. As high as 1.1 W of the total average output power at 1063.18 and 1064.37 nm is generated under an incident pump power of 5.1 W. The corresponding mode-locked pulse width is 42 ps at a pulse repetition rate of 3.82 GHz. Through the optical beating between two carrier frequencies of each spectral component, a train of ultrashort pulses with sub-terahertz repetition rate is further generated with the effective duration of down to 1.6 ps.
Highlights
Lasers emitting two spectral lines are highly attractive for a large number of applications such as biomedicine, precision metrology, differential analysis, pump-probe measurement, spectroscopic study, and so on
Through the optical beating between two carrier frequencies of each spectral component, a train of ultrashort pulses with sub-terahertz repetition rate is further generated with the effective duration of down to 1.6 ps
Experimental results further revealed that the temporal interference between two carrier frequencies of the dual-comb pulses leads to the generation of quasi-periodic fringe with the sub-terahertz repetition rate of 0.32 THz
Summary
Lasers emitting two spectral lines are highly attractive for a large number of applications such as biomedicine, precision metrology, differential analysis, pump-probe measurement, spectroscopic study, and so on. With a significant progress in the growth of laser materials, a series of disordered crystals has been extensively fabricated and identified to generally possess multiple fluorescent peaks with comparable spectral intensity Thanks to this distinctive property, directly utilizing the Nd- or Yb-doped disordered crystals as the active media becomes one of the most promising tactics for constructing a dual-wavelength laser in the continuous-wave, Q-switched, as well as mode-locked operations [1,2,3,4,5]. Its smaller Stark splitting and more compact multiple transitions lead to a less spiky fluorescent profile, typically causing the lasing output with a single emission line around 1.06 μm It is practically important and highly desirable to develop a promising method for achieving the dual-wavelength emission in a π-polarized Nd-doped vanadate laser
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