1.
Opt Express
; 30(7): 11472-11478, 2022 Mar 28.
Article
in English
| MEDLINE
| ID: mdl-35473090
ABSTRACT
We demonstrate terahertz (THz) wave generation by wavelength conversion in a ridge-type/bulk periodically poled lithium niobate (RT-/bulk-PPLN) under almost the same experimental conditions. When using the RT-PPLN, the ridge structure works as a slab waveguide for the incident pump beam (wavelength: â¼1â µm), and the generated THz wave (â¼200â µm) was emitted uniformly from the entire side surface of the crystal. The RT-PPLN has a much higher conversion efficiency from the pumping beam to the THz wave than the bulk-PPLN, and the ratio improved several ten times compared with those of previous studies.