Create and Measure the Spontaneous Parametric Down Conversion
|Keywords:||軌道角動量;光;相位匹配;參數振動;orbital angular momentum;light;phase matching;down conversion||Issue Date:||2005||Abstract:||null
We hope to verify the conservation of orbital angular momentum (OAM) of
light under the spontaneous parametric down-conversion (SPDC) process.
We use laser(with 355nm-wavelength) to pump a β − BaB2O4 (BBO)
crystal. Because of the nonlinear property of the BBO crystal, the degenerate
SPDC could happen in the crystal. Therefore, one 355nm photon would
converted to two 710nm photons. We make use of the birefringence property
of the BBO crystal to achieve beamlike Type II phase-matching. Under this
phase-matching, it is efficient to collect the down-converted 710nm light.
We plan to make the pump light carry the OAM with l = 0 or l = 1 by
means of the hologram. On the other way, we use a new-reported method
to measure the OAM of the down-converted 710nm light. And, making use
of the coincidence-counting tool, we could verify the conservation of OAM
Under the SPDC process, the down-converted 710nm photon pairs are
in the entangled state. Therefore, this experiment is related to the OAM
of light and the entangled state which the quantum theory predicts. These
two subjects are worthy of studying.
|Appears in Collections:||物理學系|
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