{"title":"Dual-wavelength generator for high-efficiency difference frequency generation of a terahertz wave.","authors":"Wei Li, Feng Qi, Qiaoqiao Fu, Pengxiang Liu, Xu Guo, Weifan Li, Yelong Wang, Zhaoyang Liu","doi":"10.1364/OL.555067","DOIUrl":null,"url":null,"abstract":"<p><p>It has been two decades since the invention of THz wave difference frequency generation (DFG) by using organic crystal DAST. The dual-KTiOPO<sub>4</sub> (KTP) optical parametric oscillator (OPO) structure is a kind of quite popular dual wavelength generator since it is convenient for realization. However, the imbalance of both pumping power and efficiency at two KTPs is normal, and it leads to a deviation from ideal 1:1 on the output energy ratio of dual wavelengths. In this paper, on one hand, we find a method to balance the output energy of dual-KTP OPO under most conditions. On the other hand, we propose to use two single-KTP OPOs to replace the dual-KTP OPO. In this way, both the power balance and beam pattern can be guaranteed, and thus the DFG efficiency is significantly improved. Compared with a non-optimized dual-KTP OPO setup (energy ratio 1:5), the DFG efficiency is enhanced by an average factor of 2.59 and a maximum factor of 8.68 (at 18.6 THz).</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1791-1794"},"PeriodicalIF":3.1000,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1364/OL.555067","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
It has been two decades since the invention of THz wave difference frequency generation (DFG) by using organic crystal DAST. The dual-KTiOPO4 (KTP) optical parametric oscillator (OPO) structure is a kind of quite popular dual wavelength generator since it is convenient for realization. However, the imbalance of both pumping power and efficiency at two KTPs is normal, and it leads to a deviation from ideal 1:1 on the output energy ratio of dual wavelengths. In this paper, on one hand, we find a method to balance the output energy of dual-KTP OPO under most conditions. On the other hand, we propose to use two single-KTP OPOs to replace the dual-KTP OPO. In this way, both the power balance and beam pattern can be guaranteed, and thus the DFG efficiency is significantly improved. Compared with a non-optimized dual-KTP OPO setup (energy ratio 1:5), the DFG efficiency is enhanced by an average factor of 2.59 and a maximum factor of 8.68 (at 18.6 THz).
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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