Mr. Qihao Hu Profile

Qihao Hu

at National Univ. of Defense Technology

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Publications (9)

Proceedings Article | 6 June 2021 Paper

Mitigation of simulated Raman scattering in fiber laser oscillator using long period fiber grating

Qihao Hu, Xin Tian, Binyu Rao, Meng Wang, Zefeng Wang

Proceedings Volume 11849, 118490S (2021) https://doi.org/10.1117/12.2598910

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Proceedings Article | 12 March 2021 Paper

On-line temperature measurement for OC-FBG in fiber oscillator

Pengrui Wang, Qihao Hu, Xin Tian, Meng Wang, Zefeng Wang

Proceedings Volume 11763, 117638C (2021) https://doi.org/10.1117/12.2587579

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Proceedings Article | 2 December 2020 Paper

Temperature measurement of single point through uniform fiber Bragg grating

Pengrui Wang, Qihao Hu, Meng Wang, Zefeng Wang

Proceedings Volume 11717, 117173A (2020) https://doi.org/10.1117/12.2587573

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Proceedings Article | 10 October 2020 Presentation + Paper

Raman mitigation in high-power fiber laser transmission by long period fiber grating for longer delivery distance

Qihao Hu, Xin Tian, Meng Wang, Zefeng Wang, Xiaojun Xu

Proceedings Volume 11544, 1154406 (2020) https://doi.org/10.1117/12.2573874

KEYWORDS: Oscillators, Raman scattering, Fiber lasers, Cladding, Carbon dioxide lasers

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Proceedings Article | 17 April 2020 Paper

Suppression stimulated Brillouin scattering in fibers using a tilted fiber Bragg grating

Xin Tian, Meng Wang, Qihao Hu, Zefeng Wang

Proceedings Volume 11455, 114554B (2020) https://doi.org/10.1117/12.2564894

KEYWORDS: Fiber lasers, Fiber Bragg gratings, Scattering, Acoustics, Laser scattering, Optical fibers, Light scattering, Single mode fibers, Optical amplifiers, Optical filters

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Proceedings Article | 14 May 2019 Presentation

Online measurement of core temperature inside fiber lasers by fiber Bragg gratings (Conference Presentation)

Qihao Hu, Zefeng Wang, Xiaoming Xi, Chen Shi, Wenguang Liu, Jinbao Chen

Proceedings Volume 11028, 1102807 (2019) https://doi.org/10.1117/12.2522692

KEYWORDS: Fiber Bragg gratings, Temperature metrology, Fiber lasers, Structured optical fibers, Reflectivity, High power fiber lasers, Manufacturing, Composites, Infrared detectors, Infrared imaging

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On-line measurement of fiber core-temperature is very important for the investigations of high-power fiber lasers. Using thermal infrared imager is currently the most common approach to detect the temperature of fiber, even though it only monitor the surface temperature. So the measurement result is greatly different from the actual temperature of fiber core. Fiber Bragg Gratings (FBGs) have been widely used in detecting many physical quantities, such as strain, temperature, compression strength and curvature due to its intrinsic advantages, including simple manufacture technology, low insertion loss. Here, a new method based on FBG for measuring the temperature of fiber core is presented and experimentally demonstrated. We use a mutiple inscription method that inscribe a low reflectivity FBG on the high reflectivity chirp grating location as a fiber core temperature on-line monitor. Due to the resonant wavelength of chirp grating (1080nm) is far away from FBG’s resonance peak (1550nm), it means that the presence of FBG will not impact the performance of the chirp grating. Alongside this composite optical fiber structure is applied to fiber oscillator we inject a amplified spontaneous emission (ASE) light with the wavelength range near 1550 nm from the signal fiber of (2+1)*1 combiner. And then, the reflection spectrum of FBG can be record from the port 2 of circulator. The temperature of chirp grating and low reflectivity FBG can be measure by recording the shift of FBG’s resonance peak after the lineal relation between resonance wavelength and temperature are cofirmed. In order to detect the accuracy of this new structure, we also use Optical Frequency Domain Reflectometer (OFDR) to measure the temperature of the chirp grating. Experiment results prove the high accuracy of proposed temperature monitor. It is strongly believed that the novel proposed structure can be used to achieve measurement of fiber core temperature in high-power fiber lasers. This work also provides a novel idea for manufacturing multi-functional composite fiber structure.

Proceedings Article | 5 November 2018 Paper

Suppression of stimulated Raman scattering in a monolithic fiber laser oscillator using chirped and tilted fiber Bragg gratings

Meng Wang, Qihao Hu, Le Liu, Zefeng Wang, Xiaojun Xu

Proceedings Volume 10811, 108110V (2018) https://doi.org/10.1117/12.2500861

KEYWORDS: Oscillators, Fiber lasers, Fiber Bragg gratings, Raman scattering, Optical filters, Manufacturing

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Proceedings Article | 5 November 2018 Paper

Mitigating stimulated brillouin scattering in fiber using tilted fiber Bragg grating

Meng Wang, Le Liu, Qihao Hu, Zefeng Wang, Xiaojun Xu

Proceedings Volume 10811, 108110C (2018) https://doi.org/10.1117/12.2500866

KEYWORDS: Scattering, Fiber Bragg gratings, Optical amplifiers, Fiber lasers, Optical filters, High power fiber amplifiers, Optical fibers

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Proceedings Article | 14 November 2016 Paper

Simultaneous measurement of temperature and strain based on composite long-period fiber grating

Chengguo Tong, Qihao Hu, Jiang He, XuDong Chen, Tao Geng, Zhanjing Bao, Zixuan Li, Wenlei Yang, Weimin Sun

Proceedings Volume 10025, 1002503 (2016) https://doi.org/10.1117/12.2246917

KEYWORDS: Temperature metrology, Composites, Optical fibers, Cladding, Sensors, Gas lasers, Refractive index, Carbon monoxide, Structured optical fibers

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Showing 5 of 9 publications

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