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Optical vortices, having doughnut-shaped spatial profile with zero intensity around the phase singularity, are of great interest due to its wide range of applications in variety of fields in science and technology. Two spatially separated entwined vortices with opposite topological charge forms a vortex dipoles. Due to their entwining nature, the vortex dipoles are created and annihilated in pairs...
We report a continuous-wave, doubly-resonant optical parametric oscillator pumped with first-order vortex green beam, producing first-order vortex in the signal (949.5–1060nm), and corresponding idler, in Gaussian profile, with maximum power ∼75mW and 165mW, respectively.
We present a comparative study on frequency-doubling characteristics of femtosecond laser pulses in thick nonlinear crystals with different temporal and spatial walk-off parameters. Using single-pass second harmonic generation (SHG) of 260 fs pulses at 1064 nm from a high-average-power femtosecond Yb-fiber laser in 5-mm-long crystals of β-BaB 2O4 (BBO) and BiB3O6 (BIBO), we find that for comparable...
We report on all periodically-poled crystals based singly-resonant optical parametric oscillator (SRO) generating continuous-wave, single-frequency, tunable UV radiation with maximum output power of 336mW in 18.5 MHz line-width at 399.2nm. It has tunability of 18nm.
We demonstrate a new class of optical parametric oscillators producing high-power, output beam in 2-D Airy intensity profile. The Airy beam has output power >8 W, longest ever acceleration length (>2 m), and wavelength tunability across 1.51–1.971 μm.
The development of ultrafast optical sources in the ultraviolet (UV) is of interest for variety of applications from quantum optics to biology. With the scarcity of solid-state lasers in the UV, nonlinear frequency conversion techniques represent a promising route for the generation of such source. In particular, intracavity frequency doubling of optical parametric oscillators (OPO) synchronously-pumped...
We are describing a novel way to find the Mueller matrix of an arbitrary optical element, by taking advantage of projection of resulting polarization states on four known input polarization states by using Simon-Mukunda gadget.
We have studied spatial distribution of the parametric down-converted photons for a gaussian pump beam and observed that the spatial extent of these photons increases linearly with increasing size of the pump beam.
We show that determination of the orbital angular momentum (OAM) of an optical vortex can be possible using simple convex lens, an ubiquitous optical element found in any optics laboratory.
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