Story perspectives

Breakthrough in Spectroscopy: Detecting Sub-THz Waves

10/24/2025

50 6

Summary

Story summary

Researchers detected a frequency up-conversion signal from sub-THz waves with a dual-periodically poled lithium niobate (PPLN) crystal setup via a backward parametric process indicating spectroscopy potential.
The experiment used a microchip neodymium-doped yttrium aluminum garnet (Nd:YAG) laser and a 308 GHz wave.
The optimal pump pulse energy for detection was 5.5 mJ.
Detection sensitivity was limited by scattered light noise.
Future work will redesign PPLN crystal to improve detection range.

1 of 1

Story summary

Researchers detected a frequency up-conversion signal from sub-THz waves with a dual-periodically poled lithium niobate (PPLN) crystal setup via a backward parametric process indicating spectroscopy potential.
The experiment used a microchip neodymium-doped yttrium aluminum garnet (Nd:YAG) laser and a 308 GHz wave.
The optimal pump pulse energy for detection was 5.5 mJ.
Detection sensitivity was limited by scattered light noise.
Future work will redesign PPLN crystal to improve detection range.