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The study demonstrates the temperature effect on single-cycle biphoton generation in type II SPDC using chirp QPM PPLN, suggesting optimization methods.
We study the temperature-dependent type II spontaneous parametric down-conversion (SPDC) in the linearly chirped quasi-phase-matching (QPM) periodically poled lithium niobate (PPLN) crystal. The SPDC process can generate the biphotons with the single-cycle level. It shows that the chirp rate of the poled grating periods is the main influence factor for the phase matching function, frequency response range, Fedorov parameter and the count rate of the biphotons. Meanwhile, the temperature plays an important role for the type of e→ o+e, the higher temperature makes the frequency response range be wider, Fedorov parameter and count rate be higher. However, the appropriate chirp rate and temperature can help the type II SPDC generate the single cycle biphotons in chirp QPM PPLN.
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Lin et al. (2026) studied this question.
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