Few-mode squeezing in type-I parametric downconversion by complete group velocity matching
arxiv(2024)
摘要
Frequency-degenerate pulsed type-I parametric downconversion is a widely used
source of squeezed light for numerous quantum optical applications. However,
this source is typically spectrally multimode and the generated squeezing is
distributed between many spectral modes with a limited degree of squeezing per
mode. We show that in a nonlinear crystal, where the condition of complete
group velocity matching for the pump and the signal is satisfied, the number of
generated modes may be as low as 2 or 3 modes. We illustrate the general theory
with the example of the MgO-doped lithium niobate crystal pumped at 775 nm and
generating squeezed light at 1.55 μm. Our model includes the derivation of
the degree of squeezing from the properties of the pump and the crystal and
shows that 12 dB of squeezing can be obtained in a periodically poled crystal
of length 80 mm.
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