Abstract
Airy beam, a non-diffracting waveform, has peculiar properties of self-healing and self-acceleration. Due to such unique properties, the Airy beam finds many applications including curved plasma wave-guiding, micro-particle manipulation, optically mediated particle clearing, long distance communication, and nonlinear frequency conversion. However, many of these applications including laser machining of curved structures, generation of curved plasma channels, guiding of electric discharges in a curved path, study of nonlinear propagation dynamics, and nonlinear interaction demand Airy beam with high power, energy, and wavelength tunability. Till date, none of the Airy beam sources have all these features in a single device. Here, we report a new class of coherent sources based on cubic phase modulation of a singly-resonant optical parametric oscillator (OPO), producing high-power, continuous-wave (cw), tunable radiation in 2-D Airy intensity profile existing over a length >2 m. Based on a MgO-doped periodically poled LiNbO3 crystal pumped at 1064 nm, the Airy beam OPO produces output power more than 8 W, and wavelength tunability across 1.51–1.97 μm. This demonstration gives new direction for the development of sources of arbitrary structured beams at any wavelength, power, and energy in all time scales (cw to femtosecond).
Highlights
In the experiment, we have devised the SRO in a compact four mirror ring cavity (Fig. 1(a), and see Methods) consisting of two curved mirrors, M1 and M2 and two plane mirrors, M3 and M4
The + 1 order diffracted beam of the cubic phase mask (CPM) placed inside cavity between mirrors M3 and M4 is Fourier transformed into Airy beam using a lens of focal length f = 300 mm
Do value measured by fitting equation (2) to the beam deflection with propagation at different wavelengths prove inverse relation of the deflection coefficient of the Airy beam to its wavelength (Fig. 2(l)). Such finding validates that the Airy beam optical parametric oscillator (OPO) provides output beam with tunable acceleration
Summary
We report a new class of coherent sources based on cubic phase modulation of a singly-resonant optical parametric oscillator (OPO), producing high-power, continuous-wave (cw), tunable radiation in 2-D Airy intensity profile existing over a length >2 m. Based on a MgO-doped periodically poled LiNbO3 crystal pumped at 1064 nm, the Airy beam OPO produces output power more than 8 W, and wavelength tunability across 1.51–1.97 μm This demonstration gives new direction for the development of sources of arbitrary structured beams at any wavelength, power, and energy in all time scales (cw to femtosecond). We report, for the first time to the best of our knowledge, a source of high-power, cw, tunable radiation in 2-D Airy intensity profile based on cubic phase modulation of a cw SRO using an intra-cavity diffractive optical element.
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