Abstract
The 3 ps pulses are amplified to ~20 GW peak power in a TEA CO(2) laser using ac Stark broadening. Demonstration of such broadband coherent amplification of 10 μm pulses opens opportunities for a powerful mid-IR source at a high-repetition rate.
Highlights
Progress on chirped-pulse amplification (CPA) in large bandwidth gain media has made possible to achieve multi-TW powers in ultra-short pulses around λ~1 μm at a high-repetition rate [1]
To study the effect of field broadening on short pulse amplification where the bandwidth is continually increasing with the 10 μm field intensity, we have modeled amplification for the train of 3 ps pulses typically recorded in the present experiment
We have demonstrated coherent amplification of 10 μm 3 ps pulses in an atmospheric CO2 laser in which the bandwidth is determined by strong field broadening of the lasing transition
Summary
Progress on chirped-pulse amplification (CPA) in large bandwidth gain media has made possible to achieve multi-TW powers in ultra-short pulses around λ~1 μm at a high-repetition rate [1]. Availability of such intense solid-state lasers has resulted in the development of new compact sources of X-rays and charged particles [2]. The maximum laser energy transferred to an electron in the laser field is determined by the ponderomotive potential, which scales as Iλ2, where I is the laser intensity This relationship implies certain advantages of longer wavelength lasers for X-ray production via HHG [3] and laser particle acceleration and provides a strong motivation to develop TW-class lasers in the mid-IR range. As a result output of a multiatmosphere CO2 amplifier is limited because of small volume and the systems typically operate in a single-shot regime
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