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Does pump beam intensity affect the efficiency of spontaneous parametric down conversion?

Ozgün Süzer¹, Theodore G Goodson

¹Applied Physics Program, The University of Michigan, Ann Arbor, MI 48109-1055, USA.

|December 10, 2008

Summary

The spontaneous parametric down conversion (SPDC) process efficiency depends on pump intensity, contrary to prior theory. This finding, achieved by modifying the pump field description, enhances photon pair generation for practical applications.

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Area of Science:

Quantum optics
Nonlinear optics

Background:

The plane-wave model for spontaneous parametric down conversion (SPDC) neglects geometric effects.
Previous theoretical predictions suggested SPDC efficiency is independent of pump intensity.

Purpose of the Study:

To investigate the dependence of SPDC efficiency on pump intensity.
To incorporate geometric effects into the pump field description for a more accurate model.
To enhance the photon yield for practical applications requiring high flux.

Main Methods:

Modified the pump field description from plane-wave to spherical-like to include geometric effects.
Conducted experimental investigations under focused pumping conditions with constant pump divergence.
Collected down-converted photon pairs behind a large aperture.
Performed numerical modeling of the modified pump field description.

Main Results:

SPDC efficiency was found to depend on pump intensity, contradicting previous theories.
Experimental results showed a strong dependence of photon yield on pump intensity.
An enhancement in down-conversion efficiency was observed.
Numerical calculations showed good agreement with experimental observations.

Conclusions:

A modified pump field description incorporating geometric effects reveals pump intensity dependence in SPDC efficiency.
This approach enhances down-conversion efficiency and photon yield.
The findings are beneficial for applications utilizing entangled photon pairs requiring high flux.