In this paper,we propose a temperature-sensing scheme utilizing a passively mode-locked fiber laser combined with the beat frequency demodulation system.The erbium-doped fiber is used in the laser ring cavity to provi...In this paper,we propose a temperature-sensing scheme utilizing a passively mode-locked fiber laser combined with the beat frequency demodulation system.The erbium-doped fiber is used in the laser ring cavity to provide the gain and different lengths of single-mode fibers inserted into the fiber ring cavity operate as the sensing element.Different temperature sensitivities have been acquired in the experiment by monitoring the beat frequency signals at different frequencies.The experimental results indicate that the beat frequency shift has a good linear response to the temperature change.The sensitivity of the proposed sensor is about-44 kHz/℃ when the monitored beat frequency signal is about 10 GHz and the ratio of the sensing fiber to the overall length of the laser cavity is 10 m/17.5 m,while the signal-to-noise ratio(SNR)of the monitored signal is approximately 30 dB.The proposed temperature-sensing scheme enjoys attractive features such as tailorable high sensitivity,good reliability,high SNR,and low cost,and is considered to have great potential in practical sensing applications.展开更多
We have successfully generated a 1.3/1.4μm random fiber laser(RFL)using bismuth(Bi)-doped phosphosilicate fiber.The Bi-doped RFL has shown excellent long-term operational stability with a standard deviation of approx...We have successfully generated a 1.3/1.4μm random fiber laser(RFL)using bismuth(Bi)-doped phosphosilicate fiber.The Bi-doped RFL has shown excellent long-term operational stability with a standard deviation of approximately 0.34%over 1 h at a maximum output power of 549.30 mW,with a slope efficiency of approximately 29.21%.The Bi-doped phosphosilicate fiber offers an emission spectrum ranging from 1.28 to 1.57μm,indicating that it can be tuned within this band.Here,we demonstrated a wavelength-tuning fiber laser with a wavelength of 1.3/1.4μm,achieved through the using of a fiber Bragg grating or a tunable filter.Compared to traditional laser sources,the RFL reduces the speckle contrast of images by 11.16%.Due to its high stability,compact size,and high efficiency,this RFL is highly promising for use in biomedical imaging,communication,and sensor applications.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)(No.61975167)。
文摘In this paper,we propose a temperature-sensing scheme utilizing a passively mode-locked fiber laser combined with the beat frequency demodulation system.The erbium-doped fiber is used in the laser ring cavity to provide the gain and different lengths of single-mode fibers inserted into the fiber ring cavity operate as the sensing element.Different temperature sensitivities have been acquired in the experiment by monitoring the beat frequency signals at different frequencies.The experimental results indicate that the beat frequency shift has a good linear response to the temperature change.The sensitivity of the proposed sensor is about-44 kHz/℃ when the monitored beat frequency signal is about 10 GHz and the ratio of the sensing fiber to the overall length of the laser cavity is 10 m/17.5 m,while the signal-to-noise ratio(SNR)of the monitored signal is approximately 30 dB.The proposed temperature-sensing scheme enjoys attractive features such as tailorable high sensitivity,good reliability,high SNR,and low cost,and is considered to have great potential in practical sensing applications.
基金supported by the National Natural Science Foundation of China Youth Fund(No.62105272)the Fujian Natural Science Foundation Youth Project(No.2021J05016)+1 种基金the Fundamental Research Funds for the Central Universities(No.2072020109)the National Science Fund for Excellent Young Scholars(No.62022069)。
文摘We have successfully generated a 1.3/1.4μm random fiber laser(RFL)using bismuth(Bi)-doped phosphosilicate fiber.The Bi-doped RFL has shown excellent long-term operational stability with a standard deviation of approximately 0.34%over 1 h at a maximum output power of 549.30 mW,with a slope efficiency of approximately 29.21%.The Bi-doped phosphosilicate fiber offers an emission spectrum ranging from 1.28 to 1.57μm,indicating that it can be tuned within this band.Here,we demonstrated a wavelength-tuning fiber laser with a wavelength of 1.3/1.4μm,achieved through the using of a fiber Bragg grating or a tunable filter.Compared to traditional laser sources,the RFL reduces the speckle contrast of images by 11.16%.Due to its high stability,compact size,and high efficiency,this RFL is highly promising for use in biomedical imaging,communication,and sensor applications.
