Praveen K. Vudyasetu

Interferometric weak value deflections: Quantum and classical treatments

We derive the weak value deflection given in an article by Dixon et al.[P. B. Dixon et al. Phys. Rev. Lett. 102 173601 (2009)] both quantum mechanically and classically, including diffraction effects. This article is meant to cover some of the mathematical details omitted in that article owing to space constraints.

Storage and retrieval of optical pulses using a two-color optical memory

The complete waveforms of 1.4 mus optical signal pulses are delayed and stored using a coherently prepared warm Rb vapor, and then recovered up to 500 mus later (with a factor of 2 temporal pulse broadening). Mediated by four-wave mixing, frequency-shifted idler pulses are generated, and then stored and retrieved simultaneously with the signal pulses. The intensities of the retrieved pulses depend linearly on the intensity of the retrieving coupling beam.

Rapidly reconfigurable slow-light system based on off-resonant Raman absorption

We present a slow-light system based on dual Raman absorption resonances in warm rubidium vapor. Each Raman absorption resonance is produced by a control beam in an off-resonant Λ system. This system combines all optical control of the Raman absorption and the low-dispersion broadening properties of the double Lorentzian absorption slow light. The bandwidth, group delay, and central frequency of the slow-light system can all be tuned dynamically by changing the properties of the control beam. We demonstrate multiple pulse delays with low distortion and show that such a system has fast switching dynamics and thus fast reconfiguration rates.

Four wave mixing (FWM) and electromagnetically induced transparency (EIT) based coherent image storage in hot atomic vapors

We demonstrate storage of images carried by optical pulses in hot vapors using a combination of FWM and EIT and show that the images retrieved are robust to diffusion.

Four Wave Mixing Based Stopped Light in Optically Thick Hot Rubidium Vapor

We discuss stored light in warm Rubidium vapor. Mediated by FWM, the idler pulses are spontaneously generated in the medium, and then stored and retrieved simultaneously with the signal pulses.

Storage and Retrieval of Images in Hot Atomic Rubidium Vapor

We demonstrate four wave mixing and electromagnetically induced transparency mediated storage of multimode transverse images carried by optical pulses in hot atomic Rubidium vapor and show that the images retrieved are robust to diffusion.

Slow Light with Fourth Order Fields

We demonstrate experimentally the preservation of entanglement between delayed and non-delayed members of energy-time entangled biphotons, as well as the preservation of fourth order temporal coherence of thermal light with a delayed version of itself.

Storing and Manipulating Multimode Transverse Images in Hot Atomic Vapors

We demonstrate storage and retrieval of images carried by optical pulses in hot atomic vapor and demonstrate image correlation operation using this set up.