| Issue |
J. Eur. Opt. Society-Rapid Publ.
Volume 21, Number 2, 2025
|
|
|---|---|---|
| Article Number | 38 | |
| Number of page(s) | 8 | |
| DOI | https://doi.org/10.1051/jeos/2025033 | |
| Published online | 11 August 2025 | |
Research Article
The temperature-dependent in noncollinear SPDC for generating biphotons with single cycles
Institute of Mechanical & Electrical Technology, Taizhou Vocational & Technical College, Taizhou 318000, PR China
* Corresponding author: linhb@tzvtc.edu.cn
Received:
24
June
2025
Accepted:
11
July
2025
The influence of temperature on generating single cycle biphotons by noncollinear spontaneous parametric down-conversion (SPDC) in chirped quasi-phase-matching (QPM) periodically poled lithium niobate (PPLN) crystal have been studied in this paper. Numerical simulation shows that characteristics of the biphotons are mainly determined by the phase matching function which is dependent on the angle of the noncollinear SPDC and the temperature of the nonlinear crystal. Moreover, the angle plays a more significant role in noncollinear SPDC. The smaller angle and lower temperature can produce better phase matching effect while the angle and temperature changes within an appropriate range. The count rate of the biphotons will decrease, the bandwidth of biphotons will be compressed and the temporal width is widened for a certain appropriate angle in noncollinear SPDC while temperature is increased. However, as long as the angle and temperature are suitable, the biphotons generated by SPDC in the chirped QPM PPLN crystal are ultrashort pulses with single cycles.
Key words: Chirped QPM / Single cycles / Biphotons / Sellmeier equation / Noncollinear
© The Author(s), published by EDP Sciences, 2025
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