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Journal Article

Compensation of anisotropy effects in a nonlinear crystal for squeezed vacuum generation

MPS-Authors
/persons/resource/persons201151

Perez,  A. M.
International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society;
Optical Technologies, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society;
Quantum Radiation, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201101

Just,  F.
Optical Technologies, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society;
Quantum Radiation, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201030

Cavanna,  A.
Optical Technologies, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society;
Quantum Radiation, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201034

Chekhova,  M. V.
Quantum Radiation, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Optical Technologies, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201115

Leuchs,  G.
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Perez, A. M., Just, F., Cavanna, A., Chekhova, M. V., & Leuchs, G. (2013). Compensation of anisotropy effects in a nonlinear crystal for squeezed vacuum generation. LASER PHYSICS LETTERS, 10(12): 125201. doi:10.1088/1612-2011/10/12/125201.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-66DF-0
Abstract
Squeezed vacuum can be obtained by an optical parametric amplifier (OPA) with the quantum vacuum state at the input. We are interested in a degenerate type-I OPA based on parametric down-conversion (PDC) where, due to phase matching requirements, an extraordinary polarized pump must impinge onto a birefringent crystal with a large chi((2)) nonlinearity. As a consequence of the optical anisotropy of the medium, the spatial spectrum of the generated radiation is affected by the transverse walk-off. In this work we describe a method that reduces the spatial distortions, by using two consecutive crystals instead of one. We show that after anisotropy compensation the two-photon amplitude becomes symmetric, allowing for a simple Schmidt expansion, a procedure that in practice requires states that come from experimental systems free of anisotropy effects. Qualitative experimental observations are made for the case of high-gain PDC.