Abstract
We report on the first realization of an ultrafast Airy beam optical parametric oscillator (OPO). By introducing intracavity cubic phase modulation to the resonant Gaussian signal in a synchronously-pumped singly-resonant OPO cavity and its subsequent Fourier transformation, we have generated 2-dimensional Airy beam in the output signal across a 250 nm tuning range in the near-infrared. The generated Airy beam can be tuned continuously from 1477 to 1727 nm, providing an average power of as much as 306 mW at 1632 nm in pulses of ~23 ps duration with a spectral bandwidth of 1.7 nm.
Highlights
The two-dimensional (2-D) intensity distribution of a finite-energy Airy beam can be expressed in the form
We demonstrate, for the first time to our knowledge, a new class of Airy beam source based on an ultrafast OPO
The two-dimensional (2-D) intensity distribution of a finite-energy Airy beam can be expressed in the form, I = Πm=x,y Abs (Aiexp(amsm))[2]
Summary
The two-dimensional (2-D) intensity distribution of a finite-energy Airy beam can be expressed in the form,. To study self-acceleration of the generated beam across the SRO tuning range, we recorded the intensity profile as a function of propagation distance at an arbitrary wavelength (λAiry = 1490 nm), and measured the position of the beam (central lobe). To verify non-diffraction property of the Airy beam, we measured the full-width at half-maximum (FWHM) linewidth of the central lobe of the beam at a wavelength, λAiry = 1630 nm, over a propagation distance of 2.7 m, with the results shown in the inset of Fig. 2(a). These results clearly confirm the self-healing nature of the generated beam corresponding to an Airy beam. The Airy beam has temporal and spectral bandwidth of Δτ~ 23 ps and Δλ= 1.7 nm, respectively, which can be improved to approach the transform limit with dispersion control of the OPO cavity
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