At 6.6 K, a Ti:PPLN waveguide phase-matches a visible-pumped, widely non-degenerate down-conversion near its designed wavelengths, but pyroelectric and photorefractive effects degrade TM modes and cause small, unpredictable spectral variations.
Bright narrowband source of photon pairs at optical telecommunication wavelengths using a type-ii periodically poled lithium niobate waveguide,
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Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides
At 6.6 K, a Ti:PPLN waveguide phase-matches a visible-pumped, widely non-degenerate down-conversion near its designed wavelengths, but pyroelectric and photorefractive effects degrade TM modes and cause small, unpredictable spectral variations.