{"title":"10-mJ-class dual-crystal Yb:KGW regenerative amplifier with M-shaped spectrum for seeding Yb:YAG lasers.","authors":"Tianze Xu, Jiajun Song, Yujie Peng, Yanyan Li, Guanguang Gao, Ziqing Wang, Zhengwen Huang, Zhengxiang Han, Yuxin Leng","doi":"10.1364/OL.612057","DOIUrl":null,"url":null,"abstract":"<p><p>We present a high-energy broadband regenerative amplifier (RA) at a repetition rate of 1 kHz with an M-shaped spectral profile, realized by incorporating two orthogonally oriented Ng-cut Yb:KGW within a single RA. Benefiting from a large-mode cavity configuration, the high-damage-threshold optical components, a thermally insensitive cavity design, and a quasi-continuous-wave (QCW) pumping scheme, the amplifier delivers output pulse energies of 13.8 mJ and 12.9 mJ before and after spectral shaping, respectively. To the best of our knowledge, this represents the highest pulse energy reported to date for a Yb:KGW RA operating at room temperature and 1 kHz. The amplifier exhibits an M-shaped spectrum with a spectral dip centered at 1030 nm, together with excellent beam quality and energy stability, making it a promising front end for Yb:YAG amplifier systems targeting the generation of hundred-millijoule, ~200-fs pulses.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 20","pages":"5665-5668"},"PeriodicalIF":3.3000,"publicationDate":"2026-10-15","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.612057","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2026/9/14 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
We present a high-energy broadband regenerative amplifier (RA) at a repetition rate of 1 kHz with an M-shaped spectral profile, realized by incorporating two orthogonally oriented Ng-cut Yb:KGW within a single RA. Benefiting from a large-mode cavity configuration, the high-damage-threshold optical components, a thermally insensitive cavity design, and a quasi-continuous-wave (QCW) pumping scheme, the amplifier delivers output pulse energies of 13.8 mJ and 12.9 mJ before and after spectral shaping, respectively. To the best of our knowledge, this represents the highest pulse energy reported to date for a Yb:KGW RA operating at room temperature and 1 kHz. The amplifier exhibits an M-shaped spectrum with a spectral dip centered at 1030 nm, together with excellent beam quality and energy stability, making it a promising front end for Yb:YAG amplifier systems targeting the generation of hundred-millijoule, ~200-fs pulses.
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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