A Lorentzian narrow-linewidth demodulation scheme based on a short fiber delayed self-heterodyne technique

Bai, Zhenxu; Zhao, Zheng‐Yin; Chen, Xiaojing; Qi, Yaoyao; Ding, Jie; Yan, Bingzheng; Wang, Yulei; Lü, Zhiwei; Mildren, Richard P.

doi:10.35848/1882-0786/ac9177

Cited by 4 publications

(3 citation statements)

References 35 publications

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“…The method obtained the same Lorentz line shape as the long-fiber self-heterodyne method. In the same year, the team proposed a short-delay coherent envelope spectrum demodulation scheme to address the issue of computational speed in iterative algorithms [ 98 ]. The relationship between the amplitude difference of a pair of extreme points (maximum and minimum) in the envelope spectrum and the linewidth and fiber length was calculated.…”

Section: Research Progressmentioning

confidence: 99%

“… ( a ) Composition of the beat frequency power spectrum [ 98 ], ( b ) coherent envelope spectra of different fiber lengths [ 99 ], ( c ) schematic diagram of the valley of the envelope spectrum submerged by background noise [ 99 ], ( d ) contrast difference between the second peak and the second valley of the envelope spectrum (CDSPST) [ 98 ]. …”

Section: Figurementioning

confidence: 99%

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Linewidth Measurement of a Narrow-Linewidth Laser: Principles, Methods, and Systems

Chen,

Sun

et al. 2024

Sensors

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Narrow-linewidth lasers mainly depend on the development of advanced laser linewidth measurement methods for related technological progress as key devices in satellite laser communications, precision measurements, ultra-high-speed optical communications, and other fields. This manuscript provides a theoretical analysis of linewidth characterization methods based on the beat frequency power spectrum and laser phase noise calculations, and elaborates on existing research of measurement technologies. In addition, to address the technical challenges of complex measurement systems that commonly rely on long optical fibers and significant phase noise jitter in the existing research, a short-delay self-heterodyne method based on coherent envelope spectrum demodulation was discussed in depth to reduce the phase jitter caused by 1/f noise. We assessed the performance parameters and testing conditions of different lasers, as well as the corresponding linewidth characterization methods, and analyzed the measurement accuracy and error sources of various methods.

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Section: Research Progressmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Linewidth Measurement of a Narrow-Linewidth Laser: Principles, Methods, and Systems

Chen,

Sun

et al. 2024

Sensors

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“…n recent years, short-pulse solid-state lasers with narrow linewidths and high pulse energies have shown promise for applications in light detection and ranging (LIDAR), [1][2][3][4] precision laser microfabrication, 5) military, 6) and medical fields. 7) For instance, an injection-seeded Nd:YAG laser with a linewidth of 0.5 m −1 achieves a maximum wind velocity sensitivity of 1.09%/(m s −1 ) with respect to the Doppler LIDAR.…”

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confidence: 99%

Stokes linewidth narrowing by stimulated Brillouin scattering in liquid media

Wang¹,

Bai²,

Hun³

et al. 2023

Appl. Phys. Express

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This work demonstrates that the Brillouin gain linewidth and pump power density are the primary factors affecting the linewidth of the Stokes pulse. As the pump power density increases, the Stokes linewidth tends to narrow and approaches the pump linewidth. This is the first study to reveal that the pump linewidth is the limiting factor in narrowing the Stokes linewidth. The Stokes linewidths of different liquid media were compared, and it was found that media with a wide Brillouin gain linewidth can be used to obtain lasers with a wider range of linewidths.

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A self-referenced optical phase noise analyzer for quantum technologies

Freund,

Marciniak,

Monz

2024

Review of Scientific Instruments

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Second generation quantum technologies aim to outperform classical alternatives by utilizing engineered quantum systems. Maintaining the coherence required to enable any quantum advantage requires detailed knowledge and control over the noise that the hosting system is subjected to. Characterizing noise processes via their power spectral density is routinely done throughout science and technology and can be a demanding task. Determining the phase noise power spectrum in leading quantum technology platforms, for example, can be either outside the reach of many phase noise analyzers or prohibitively expensive. In this work, we present and characterize a low-complexity, low-cost optical phase noise analyzer based on the short-delay optical self-heterodyne measurements for quantum technology applications. Using this setup, we compare two ≈1 Hz linewidth ultra-stable oscillators near 729 nm. Their measurements are used as a baseline to determine and discuss the noise floor achieved in this measurement apparatus with a focus on limitations and their tradeoffs. The achieved noise floor in this all-stock-component implementation of an optical phase noise analyzer compares favorably with commercial offerings. This setup can be used particularly without a more stable reference or operational quantum system as a sensor as would be the case for many component manufacturers.

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A Lorentzian narrow-linewidth demodulation scheme based on a short fiber delayed self-heterodyne technique

Cited by 4 publications

References 35 publications

Linewidth Measurement of a Narrow-Linewidth Laser: Principles, Methods, and Systems

Linewidth Measurement of a Narrow-Linewidth Laser: Principles, Methods, and Systems

Stokes linewidth narrowing by stimulated Brillouin scattering in liquid media

A self-referenced optical phase noise analyzer for quantum technologies

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