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Nitrogen ions pumped by intense femtosecond laser pulses give rise to opticalamplification in the ultraviolet range. Here, we demonstrated that a seed lightpulse carrying orbital angular momentum (OAM) can be significantly amplified innitrogen plasma excited by a Gaussian femtosecond laser pulse. With thetopological charge of +1 and -1, we observed an energy amplification of theseed light pulse by two orders of magnitude, while the amplified pulse carriesthe same OAM as the incident seed pulse. Moreover, we show that a spatialmisalignment of the plasma amplifier with the OAM seed beam leads to anamplified emission of Gaussian mode without OAM, due to the special spatialprofile of the OAM seed pulse that presents a donut-shaped intensitydistribution. Utilizing this misalignment, we can implement an optical switchthat toggles the output signal between Gaussian mode and OAM mode. This worknot only certifies the phase transfer from the seed light to the amplifiedsignal, but also highlights the important role of spatial overlap of thedonut-shaped seed beam with the gain region of the nitrogen plasma for theachievement of OAM beam amplification.

Amplification of light pulses with orbital angular momentum (OAM) in nitrogen ions lasing