Femtosecond Laser Fabricated Apodized Fiber Bragg Gratings Based on Energy Regulation

Guo, Qi; Zheng, Zhongming; Wang, Bo; Pan, Xuepeng; Liu, Shanren; Tian, Zhen‐Nan; Chen, Chao; Yu, Yong‐Sen

doi:10.3390/photonics8040110

Cited by 17 publications

(4 citation statements)

References 28 publications

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“…The Fs-apodized FBG is prepared by combining a half wave plate (HWP) and a polarization beam splitter (PBS) [ 23 , 24 ] to achieve real-time adjustment of femtosecond laser pulse energy. To maintain a high SMSR after multistage power amplification, background noise sidelobes need to be suppressed, and the apodized FBG is designated as the frequency selection element.…”

Section: Experiments Processmentioning

confidence: 99%

A 1-μm-Band Injection-Locked Semiconductor Laser with a High Side-Mode Suppression Ratio and Narrow Linewidth

Chen

Guo

et al. 2022

Sensors

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We demonstrate a narrow-linewidth, high side-mode suppression ratio (SMSR) semiconductor laser based on the external optical feedback injection locking technology of a femtosecond-apodized (Fs-apodized) fiber Bragg grating (FBG). A single frequency output is achieved by coupling and integrating a wide-gain quantum dot (QD) gain chip with a Fs-apodized FBG in a 1-μm band. We propose this low-cost and high-integration scheme for the preparation of a series of single-frequency seed sources in this wavelength range by characterizing the performance of 1030 nm and 1080 nm lasers. The lasers have a maximum SMSR of 66.3 dB and maximum output power of 134.6 mW. Additionally, the lasers have minimum Lorentzian linewidths that are measured to be 260.5 kHz; however, a minimum integral linewidth less than 180.4 kHz is observed by testing and analyzing the power spectra of the frequency noise values of the lasers.

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Section: Experiments Processmentioning

confidence: 99%

A 1-μm-Band Injection-Locked Semiconductor Laser with a High Side-Mode Suppression Ratio and Narrow Linewidth

Chen

Guo

et al. 2022

Sensors

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“…The grid has a periodic pattern, and light is scattered after hitting the grind, which is called the Bragg effect. Bragg wavelength 𝜆 𝐵 depending on the grid period and FBG guiding properties, including the refractive index 𝑛 𝑒𝑓𝑓 is formulated mathematically as shown in (1) [29], [30]. Meanwhile, the formula for calculating the refractive index distribution, 𝑛 𝑒𝑓𝑓 (𝑧) as long as FBG, is outlined (2).…”

Section: Theoretical Considerationmentioning

confidence: 99%

Apodization sensor performance for TOPAS fiber Bragg grating

et al. 2021

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Optical sensors have more capabilities than electronic sensors, and therefore provide extraordinary developments, including high sensitivity, nonsusceptibility to electromagnetic wave disturbances, small size, and multiplexing. Furthermore, fiber Bragg grating (FBG) is an optical sensor with a periodically changing grating refractive index, susceptible to strain and temperature changes. As a sensor, FBG's performance required to optimize and improve the numerical apodization function and affect the effective refractive index is considered. The grating fiber's apodization function can narrow the full width half maximum (FWHM) and reduce the optical signal's side lobes. In all the apodization functions operated by FBG, Blackman has the highest sensitivity of 15.37143 pm/°C, followed by Hamming and Gaussian, with 13.71429 pm/°C and 13.70857 pm/°C, respectively, and Uniform grating fiber with the lowest sensitivity of 12.40571 pm/°C. Hamming, Uniform, and Blackman discovered the sensitivity for a strain to be 1.17, 1.16, and 1.167 pm/microstrain, respectively. The results obtained indicated that apodization could increase FBG's sensitivity to temperature and strain sensors. For instance, in terms of other parameters, FWHM width, Hamming had the narrowest value of 0.6 nm, followed by Blackman with 0.612 nm, while Uniform had the widest FWHM of 1.9546 nm.

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“…In areas where high-quality laser pulses are desired, such as laser micromachining [1][2][3][4][5][6], ophthalmology [7] and nonlinear microscopy [8][9][10][11], nonlinear optical effects such as self-phase modulation (SPM) often limit the achievable pulse energy of high-energy ultrafast laser systems. The nonlinear optical effects introduce nonlinear spectral and temporal phase to laser pulses.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Nonlinear Phase Compensation in a Femtosecond Hybrid Laser with Varying Pulse Repetition Rate

2021

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In this manuscript, an implementation of a tunable nonlinear phase compensation method is demonstrated on a typical femtosecond hybrid laser consisting of a fiber pre-amplifier and an additional solid-state amplifier. This enables one to achieve constant laser pulse parameters over a wide range of pulse repetition rates in such a laser. As the gain in the solid-state amplifier is inversely proportional to the input power, the shortfall in the solid-state gain at higher repetition rates must be compensated for with fiber pre-amplifier to ensure constant pulse energy. This increases the accumulated nonlinear phase and consequently alters the laser pulse parameters such as pulse duration and Strehl ratio. To overcome this issue, the nonlinear phase must be compensated for, and what is more it should be compensated for to a different extent at different pulse repetition rates. This is achieved with a tunable CFBG, used also as a pulse stretcher. Using this concept, we demonstrate that constant laser pulse parameters such as pulse energy, pulse duration and Strehl ratio can be achieved in a hybrid laser regardless of the pulse repetition rate.

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Femtosecond Laser Fabricated Apodized Fiber Bragg Gratings Based on Energy Regulation

Cited by 17 publications

References 28 publications

A 1-μm-Band Injection-Locked Semiconductor Laser with a High Side-Mode Suppression Ratio and Narrow Linewidth

A 1-μm-Band Injection-Locked Semiconductor Laser with a High Side-Mode Suppression Ratio and Narrow Linewidth

Apodization sensor performance for TOPAS fiber Bragg grating

Adaptive Nonlinear Phase Compensation in a Femtosecond Hybrid Laser with Varying Pulse Repetition Rate

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