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  • Aadhi, A.; Apurv Chaitanya, N.; Singh, Ravindra P.; Samanta, Goutam Kumar (Optical Society of America, 2015-05)
    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 ...
  • Aadhi, A.; Apurv Chaitanya, N.; Jabir, M. V.; Singh, Ravindra P.; Samanta, Goutam Kumar (Optics InfoBase, 2015)
    We report on experimental demonstration of an all-periodically poled, continuous-wave (CW), high-power, single-frequency, ultra-violet (UV) source. Based on internal second-harmonic-generation (SHG) of a CW singly resonant ...
  • Chithrabhanu, P.; Aadhi, A.; Gangi Reddy, Salla; Prabhakar, Shashi; Singh, Ravindra P. (Indian Institute of Technology Kharagpur, 2014-12)
    We construct Poincar´e sphere for orbital angular momentum (OAM) states for coherent and partially coherent light beams using a non-separable state generated with modified Sagnac interferometer and a random scatterer.
  • Prabhakar, Shashi; Salla, Gangi Reddy; Ali, Anwar M. A.; Singh, Ravindra P. (The optical society, 2014-12)
    Optical vortices, although being classical, have properties of two-mode entanglement present in quantum states. We have experimentally verified the violation of Bell's inequality using Wigner distribution function for such beams.
  • Prabhakar, Shashi; Salla, Gangi Reddy; Aadhi, A.; Chithrabhanu, P.; Samanta, Goutam Kumar; Singh, Ravindra P. (The opticale society (OAS), 2014-12)
    Optical vortices, although being classical, have properties of two-mode entanglement present in quantum states. We have experimentally verified the violation of Bell's inequality using Wigner distribution function for such beams.
  • Aadhi, A.; Apurv Chaitanya, N.; Singh, Ravindra P.; Samanta, Goutam Kumar (IIT Kharagpur, 2014-12)
    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 ...
  • Aadhi, A.; Apurv Chaitanya, N.; Singh, Ravindra P.; Samanta, Goutam Kumar (Optical Society of America, 2014-06)
    We report the development of a compact, high-power, continuous-wave, single-frequency, ultraviolet (UV) source with extended wavelength tunability. The device is based on single-pass, intracavity, second-harmonic-generation ...
  • Aadhi, A.; Vaity, Pravin; Apurv Chaitanya, N.; Jabir, M. V.; Singh, Ravindra P.; Samanta, Goutam Kumar (OSA Publishing, 2015-05-10)
    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 >8W, longest ever acceleration length (>2m), and wavelength ...
  • Gangi Reddy, Salla; Prabhakar, Shashi; Ali, Anwar M. A.; Banerji, Jagannath; Singh, Ravindra P. (Indian Institute of Technology Kharagpur, 2014-12)
    We model scattered optical vortices as partially coherent optical vortices (PCOV) as well as Laguerre Gaussian Schell Model beams. A comparison with our experimental results shows the validity of modelling them as PCOV beams
  • Vaity, Pravin; Chithrabhanu, P.; Salla, Gangi Reddy; Prabhakar, Shashi; Singh, Ravindra P. (The Optical Society, 2016-02)
    Vector vortex beams are classified into four types depending upon spatial variation in their polarization vector. We have generated all four of these types of vector vortex beams by using a modified polarization Sagnac ...
  • Mandal, Subir; Pallamraju, Duggirala; Karan, Deepak K.; Phadke, Kedar A.; Singh, Ravindra P.; Suryawanshi, Pradip (Wiley, 2019-07)
    The importance of neutral wave dynamics in the understanding of the upper atmospheric processes is well?known. Conventionally, optical methods are used to derive information on the neutral wave dynamics by obtaining gravity ...
  • Apurv Chaitanya, N.; Aadhi, A.; Jabir, M. V.; Kumar, Vinayak; Singh, Ravindra P.; Samanta, Goutam Kumar (Indian Institute of Technology, Kharagpur, 2014-12)
  • Salla, Gangi Reddy; Perumangatt, Chithrabhanu; Prabhakar, Shashi; Anwar, Ali; Singh, Ravindra P. (AIP Scitation, 2015-07)
    We generate optical vortices and scatter them through a rough surface. However, the scattered light passing through a lens shows the same vorticity when probed at the Fourier plane. The vorticity is measured using a ...
  • Gangi Reddy, Salla; Chithrabhanu, P.; Prabhakar, Shashi; Aadhi, A.; Singh, Ravindra P. (Indian Institute of Technology, Kharagpur, 2014-12)
    We experimentally demonstrate that the vorticity of light remains preserved even after scattering through a ground glass plate. It shows the robustness of optical vortices along with conservation of orbital angular ...
  • Aadhi, A.; Prabhakar, Shashi; Singh, Ravindra P. (Elsevier, 2015-11)
    We experimentally show that the non-separability of polarization and orbital angular momentum present in a light beam remains preserved under scattering through a random medium like rotating ground glass. We verify this ...
  • Aadhi, A.; Apurv Chaitanya, N.; Jabir, M. V.; Singh, Ravindra P.; Samanta, Goutam Kumar (SPIE Digital Library, 2015-02-20)
    We report on development of tunable, cw, single frequency ultraviolet (UV) source based on intra-cavity frequency doubling of an optical parametric oscillator (OPO). The singly resonant OPO (SRO) is realized using 25 mm ...
  • Lal, Nijil; Anwar, Ali; Salla, Gangi Reddy; Singh, Ravindra P.; Perumangatt, Chithrabhanu (Optical Society of America, 2016-12-04)
    We demonstrate a stabilized orbital angular momentum (OAM) sorter using polarizing Sagnac interferometer containing a single dove prism. The setup is stable against small misalignments and it is shown to separate complex ...
  • Apurv Chaitanya, N.; Aadhi, A.; Singh, Ravindra P.; Samanta, Goutam Kumar (Optical Society of America, 2014-08)
    We report on experimental realization of optimum focusing condition for type-I second-harmonic generation (SHG) of high-power, ultrafast laser in “thick” nonlinear crystal. Using single-pass, frequency doubling of a 5 W ...
  • Prabhakar, Shashi; Salla, Gangi Reddy; Aadhi, A.; Perumangatt, Chithrabhanu; Samanta, Goutam Kumar; Singh, Ravindra P. (American Physical Society, 2015-08)
    We have considered optical beams with phase singularity and experimentally verified that these beams, although classical, have properties of two-mode entanglement in quantum states. We have observed the violation of Bell's ...

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