Tabletop high-energy repetition-rate picosecond lasers can be utilized to drive secondary radiation sources such as infrared lasers, facilitating more convenient and efficient research into attosecond pulses and high-energy density physics. Compared to Nd3+, Yb3+ have advantages including a small quantum defect (~9%), a longer fluorescence lifetime, high saturation fluence, high thermal conductivity of matrix crystal, and a wide range of doping concentration. The LD-pumped Yb3+-doped repetition-rate lasers possess a unique combination of pulse duration and energy, which confer an intrinsic advantage in the field of high-energy picosecond lasers. In this paper, we proposed a hybrid Yb3+-doped crystal as the gain medium, employing a multi-pass amplification configuration to achieve sub-picosecond laser output with a peak power exceeding 1 TW in 2 m3. This scheme can provide a new technical route for tens of TW high-energy picosecond lasers.
We will present our proposal for a low-coherence laser facility - 'kunwu' - based on neodymium glass amplification of super-luminescent light pulse(SLP) with ~3.5 THz (13nm) bandwidth, and the beam has been converted to second harmonics before focusing on the target. We are validating the output capability of the laser (>10J/cm2@1ω) and improving the beam quality to achieve a more smoothing focal spot. We believe that this is a very ideal driving laser for laser inertial confinement fusion, and the scheme is very likely to be the best choice for the development of high-power laser drivers.
We report a two-stage two-pass compact amplifier based on SrF2 crystal with gains of over 106. The shape of the crystal is irregular, so that the gain length is increased and parasitic oscillation is suppressed. The amplified spontaneous emission (ASE) and spectral characteristic of amplifier are analyzed. The results show that ASE increases with the pump power, and the simultaneous use of different crystals types can increase the output bandwidth. This work has a potential application in high-power / high-energy laser devices.
Regenerative amplifiers containing multiple diverse laser heads have the ability of scaling up output power as well as broadening spectral bandwidth. However, the thermal lensing effect will be more complicated. A method using a 4f system to simplify the thermal lensing effect in a multidisk condition is proposed. Two kinds of Yb-dropped sesquioxide materials are chosen as an example. On the basis of calculating the thermal lensing parameters of the thin-disk laser heads, a feasible cavity design that can minimize the fluctuation of beam size when changing the pump power is given out. The 4f system consisting of concave mirrors will introduce astigmatism in the cavity. The influence of astigmatism and the compensation method are discussed. Astigmatism can be compensated by adding extra convex mirrors and controlling the angle of incidence at each mirror.
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