Pub Date : 2026-01-22DOI: 10.1109/JQE.2026.3655616
Henry P. Freund;Patrick G. O’Shea
Terawatt x-ray free-electron lasers (XFELs) represent the frontier in further development of x-ray sources and require high current densities with strong transverse focusing. In this paper, we investigate the implications/potentialities of TW XFELs on the generation of variable polarization states. The simulations indicate that significant power levels are possible with polarizations ranging from planar to circular and at high harmonics of the XFEL resonance across this range of polarizations. These XFELs can be an important coherent source of hard x-rays through the gamma ray spectrum. For this purpose, we use the MINERVA simulation code. Simulations indicate that, for the parameters under consideration, peak powers of the order 1 TW at the fundamental are possible over the entire range of polarizations.
{"title":"The Generation of Variable Polarization States in Terawatt X-Ray Free-Electron Lasers","authors":"Henry P. Freund;Patrick G. O’Shea","doi":"10.1109/JQE.2026.3655616","DOIUrl":"https://doi.org/10.1109/JQE.2026.3655616","url":null,"abstract":"Terawatt x-ray free-electron lasers (XFELs) represent the frontier in further development of x-ray sources and require high current densities with strong transverse focusing. In this paper, we investigate the implications/potentialities of TW XFELs on the generation of variable polarization states. The simulations indicate that significant power levels are possible with polarizations ranging from planar to circular and at high harmonics of the XFEL resonance across this range of polarizations. These XFELs can be an important coherent source of hard x-rays through the gamma ray spectrum. For this purpose, we use the MINERVA simulation code. Simulations indicate that, for the parameters under consideration, peak powers of the order 1 TW at the fundamental are possible over the entire range of polarizations.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"62 1","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146082174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-19DOI: 10.1109/JQE.2026.3655618
Maxim V. Trigub;Konstantin Yu. Semenov
This paper presents the development and investigation of a compact high-frequency copper bromide vapor laser system (CuBr laser) powered by a linear transformer driver (LTD) excitation source. The laser operates at a pulse repetition frequency (PRF) of 50 kHz with a gas-discharge tube (GDT) active volume of 0.115 L and achieves an output power of up to 6.5 W. The lasing pulse is shaped by a plane-parallel resonator, and the operating mode is maintained through independent thermal control of the CuBr and HBr reservoirs, as well as the active volume (GDT wall). Key laser characteristics, including single-pass emission and superradiance (amplified spontaneous emission ASE) components, are evaluated in the context of a brightness amplifier for laser monitor systems. Detailed experimental optimization of the discharge circuit and peaking capacitor value is presented. Comparative analysis with previously reported systems shows that the specific output power (56.5 W/L) exceeds that of earlier sealed-off GDT configurations employing tacitrons and semiconductor switches. The results demonstrate the potential of LTD-based power supplies for use in high-repetition-rate lasers and optical image amplifiers, particularly in high-speed imaging applications.
{"title":"LTD-Based 50-kHz Pump Source for CuBr+Ne+HBr Laser System","authors":"Maxim V. Trigub;Konstantin Yu. Semenov","doi":"10.1109/JQE.2026.3655618","DOIUrl":"https://doi.org/10.1109/JQE.2026.3655618","url":null,"abstract":"This paper presents the development and investigation of a compact high-frequency copper bromide vapor laser system (CuBr laser) powered by a linear transformer driver (LTD) excitation source. The laser operates at a pulse repetition frequency (PRF) of 50 kHz with a gas-discharge tube (GDT) active volume of 0.115 L and achieves an output power of up to 6.5 W. The lasing pulse is shaped by a plane-parallel resonator, and the operating mode is maintained through independent thermal control of the CuBr and HBr reservoirs, as well as the active volume (GDT wall). Key laser characteristics, including single-pass emission and superradiance (amplified spontaneous emission ASE) components, are evaluated in the context of a brightness amplifier for laser monitor systems. Detailed experimental optimization of the discharge circuit and peaking capacitor value is presented. Comparative analysis with previously reported systems shows that the specific output power (56.5 W/L) exceeds that of earlier sealed-off GDT configurations employing tacitrons and semiconductor switches. The results demonstrate the potential of LTD-based power supplies for use in high-repetition-rate lasers and optical image amplifiers, particularly in high-speed imaging applications.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"62 1","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146082240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-12DOI: 10.1109/JQE.2025.3630924
Aaron R. Hawkins
{"title":"Guest Editorial: JQE 60th Anniversary: The 2010’s","authors":"Aaron R. Hawkins","doi":"10.1109/JQE.2025.3630924","DOIUrl":"https://doi.org/10.1109/JQE.2025.3630924","url":null,"abstract":"","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"61 6","pages":"1-2"},"PeriodicalIF":2.1,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11339434","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145982278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-12DOI: 10.1109/JQE.2025.3631185
John M. Dallesasse
{"title":"JQE 60th Anniversary: The 2020’s","authors":"John M. Dallesasse","doi":"10.1109/JQE.2025.3631185","DOIUrl":"https://doi.org/10.1109/JQE.2025.3631185","url":null,"abstract":"","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"61 6","pages":"1-2"},"PeriodicalIF":2.1,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11339435","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145982205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-12DOI: 10.1109/JQE.2026.3652530
James Greenberg;Brendan M. Heffernan;William F. McGrew;Antoine Rolland
High power and low phase noise oscillators at terahertz frequencies are required for several burgeoning scientific and technological applications, including radioastronomy, imaging, molecular spectroscopy, radar, and wireless communications. Operating at terahertz oscillation frequencies presents unique challenges based on the method of generation. Electronic oscillators can produce ample power but suffer from relatively high phase noise due to the nonlinear multiplication of microwave sources. Meanwhile, photomixing of optical sources provides superior spectral purity but low usable power, due to the limited bandwidth of the photomixer. We propose a hybrid solution involving injection locking of an electronic oscillator, a resonant tunneling diode, by a low phase noise photomixed source, a dual-wavelength Brillouin laser. In this study, we demonstrate a proof-of-concept injection-locking amplifier at 260 GHz, achieving up to 40 dB gain for nanowatt-level input signals. For the first time, we characterize the residual phase noise of an injection-locked waveguide RTD, showing quantitative consistency with theoretical predictions based on detailed analysis of its free-running noise. This architecture has the potential to scale to frequencies of 1 THz and beyond, which would provide a clear path to realize a terahertz oscillator with high power and low phase noise.
{"title":"Terahertz Amplification by Injection Locking of Waveguide Resonant Tunneling Diode","authors":"James Greenberg;Brendan M. Heffernan;William F. McGrew;Antoine Rolland","doi":"10.1109/JQE.2026.3652530","DOIUrl":"https://doi.org/10.1109/JQE.2026.3652530","url":null,"abstract":"High power and low phase noise oscillators at terahertz frequencies are required for several burgeoning scientific and technological applications, including radioastronomy, imaging, molecular spectroscopy, radar, and wireless communications. Operating at terahertz oscillation frequencies presents unique challenges based on the method of generation. Electronic oscillators can produce ample power but suffer from relatively high phase noise due to the nonlinear multiplication of microwave sources. Meanwhile, photomixing of optical sources provides superior spectral purity but low usable power, due to the limited bandwidth of the photomixer. We propose a hybrid solution involving injection locking of an electronic oscillator, a resonant tunneling diode, by a low phase noise photomixed source, a dual-wavelength Brillouin laser. In this study, we demonstrate a proof-of-concept injection-locking amplifier at 260 GHz, achieving up to 40 dB gain for nanowatt-level input signals. For the first time, we characterize the residual phase noise of an injection-locked waveguide RTD, showing quantitative consistency with theoretical predictions based on detailed analysis of its free-running noise. This architecture has the potential to scale to frequencies of 1 THz and beyond, which would provide a clear path to realize a terahertz oscillator with high power and low phase noise.","PeriodicalId":13200,"journal":{"name":"IEEE Journal of Quantum Electronics","volume":"62 1","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146082102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：