Characterization of the NEP of mid-infrared upconversion detectors

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Abstract

We present a scheme to estimate the noise equivalent power (NEP) of the frequency upconversion detectors (UCDs), detecting mid-infrared (MIR) light. The NEP of the UCD is a combined contribution of NEPs from the upconversion process and from the photodetector, used for detecting the upconverted signal. The 2-5- μm MIR range is particularly investigated in this letter using a bulk periodically poled lithium niobate-based CW-intracavity UCD. We measured the NEP of UCD as 20 fW Hz at the MIR wavelength of 3.39μm. Here, we showed that the limiting factor is not the noise from the upconversion process (estimated NEP is 2.3 fW Hz at 3.39 μm) but from the electrical noise in the photodetector itself. We also compared the performance of our UCD with the previously published results and with market available direct MIR detectors. In addition, we measured the optical noise of the UCD over its working spectral range (2.9- 3.6 μm) and compared with the numerical simulation.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Technical University of Denmark
  • NLIR
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Atom- och molekylfysik och optik

Nyckelord

Originalspråkengelska
Artikelnummer8665941
Sidor (från-till)681-684
Antal sidor4
TidskriftIEEE Photonics Technology Letters
Volym31
Utgivningsnummer9
StatusPublished - 2019
PublikationskategoriForskning
Peer review utfördJa