Erbium fiber lasers of continuous mode outputs and of pulsed picosecond and sub-picosecond pulses train are reported. Compact all solid state passively modulated microchip lasers are also developed to the same degree.
A metal-assisted method is proposed for the evaluation of gases’molecular abundance ratio in fiber-optic laser-induced breakdown spectroscopy(FO-LIBS).This method can reduce the laser ablation energy and make gas com...A metal-assisted method is proposed for the evaluation of gases’molecular abundance ratio in fiber-optic laser-induced breakdown spectroscopy(FO-LIBS).This method can reduce the laser ablation energy and make gas composition identification possible.The principle comes from the collision between the detected gases and the plasma produced by the laser ablation of the metal substrate.The interparticle collision in the plasma plume leads to gas molecules dissociating and sparking,which can be used to determine the gas composition.The quantitative relationship between spectral line intensity and molecular abundance ratio was developed over a large molecular abundance ratio range.The influence of laser ablation energy and substrate material on gas quantitative calibration measurement is also analyzed.The proposed metal-assisted method makes the measurement of gases’molecular abundance ratios possible with an FO-LIBS system.展开更多
We present a theoretical analysis and an experimental study of the impacts of external optical feedback on dualfrequency fiber lasers. The external optical feedback can effectively suppress the phase noise of the beat...We present a theoretical analysis and an experimental study of the impacts of external optical feedback on dualfrequency fiber lasers. The external optical feedback can effectively suppress the phase noise of the beat notes of dual-frequency fiber lasers, provided some requirements are satisfied. The polarization of the optical feedback is important for the fiber laser's stability, and it can also tune the beat note frequency. A side effect of external optical feedback, as demonstrated in the experiments, is lowering the sensitivity of the dual-frequency fiber laserbased sensors, although such degradation is not obvious.展开更多
We experimentally discussed the output characteristics of a passively mode-locked erbium-doped fiber laser using a single-mode fiber(SMF)structure as a saturable absorber(SA)based on nonlinear optic loop mirror(NOLM)....We experimentally discussed the output characteristics of a passively mode-locked erbium-doped fiber laser using a single-mode fiber(SMF)structure as a saturable absorber(SA)based on nonlinear optic loop mirror(NOLM).The NOLM acting as an SA has properties of controllable pulse interval and pulse width.Four different types of NOLMs are experimentally discussed and the results show that fine adjustment to the coupler ratio together with optimization of the SMF length inside the NOLM can simultaneously implement high pulse energy and pulse internal tunability.The laser configuration provides a method to generate well-performing mode-locked lasing,and the investigations of the effects of changing some parameters of the laser also provide some help for the development of mode-locked fiber laser based on NOLM.展开更多
We report a Tm-doped noise-like mode-locked(NLML)pulsed fiber laser with a compact linear cavity which consists of dual nonlinear optical loop mirrors(NOLMs).The design of dual-NOLM shows both exceptional compactness ...We report a Tm-doped noise-like mode-locked(NLML)pulsed fiber laser with a compact linear cavity which consists of dual nonlinear optical loop mirrors(NOLMs).The design of dual-NOLM shows both exceptional compactness in construction and distinct flexibility.In this laser,mode-locking can be realized through the nonlinear optical loop mirror technique.Stable noise-like mode-locked pulses with spectral bandwidth of 29.18 nm and pulse energy of 46 nJ are generated at a central wavelength of 1999.7 nm.Our results indicate that such a simple and inexpensive structure can pave the way for the development of generating supercontinuum with desirable performance.展开更多
We report a 2 kW all-fiberized Raman fiber amplifier with efficient brightness enhancement based on the graded-index fiber.The maximum power output reaches up to 2.034 kW centered at 1130 nm,with a conversion efficien...We report a 2 kW all-fiberized Raman fiber amplifier with efficient brightness enhancement based on the graded-index fiber.The maximum power output reaches up to 2.034 kW centered at 1130 nm,with a conversion efficiency of 79.35%with respect to the injected pump power.To the best of our knowledge,this is the highest conversion efficiency obtained for any Raman laser system using graded-index fiber.An optimized fiber combiner adopting graded-index fiber as the pigtail fiber was fabricated,enabling the preservation of the seeding brightness in the core-pumped Raman fiber amplifier,and further enhancing the ultimate brightness of the output laser after amplification.At the maximum power output,the beam quality parameter M2 is 2.8,corresponding to a signal-to-pump brightness enhancement factor of 11.2.As far as we know,we obtain the highest brightness enhancement among Raman fiber lasers of over 100 W,and the best beam quality for graded-index Raman fiber lasers of over 150 W.展开更多
Asymmetrical bound solitons train with pulsewidth of 103fs and separation of 585.5fs without any CW components are observed from Figure-8 passive mode locked fiber laser, the separation and pulsewidth keep unchanged e...Asymmetrical bound solitons train with pulsewidth of 103fs and separation of 585.5fs without any CW components are observed from Figure-8 passive mode locked fiber laser, the separation and pulsewidth keep unchanged even after 1.2Km SMF.展开更多
文摘Erbium fiber lasers of continuous mode outputs and of pulsed picosecond and sub-picosecond pulses train are reported. Compact all solid state passively modulated microchip lasers are also developed to the same degree.
基金supported by the National Key R&D Program of China(No.2017YFC1200400)the Development Fund of Institute of Fluid Physics,China Academy of Engineering Physics(No.SFZ20150302)。
文摘A metal-assisted method is proposed for the evaluation of gases’molecular abundance ratio in fiber-optic laser-induced breakdown spectroscopy(FO-LIBS).This method can reduce the laser ablation energy and make gas composition identification possible.The principle comes from the collision between the detected gases and the plasma produced by the laser ablation of the metal substrate.The interparticle collision in the plasma plume leads to gas molecules dissociating and sparking,which can be used to determine the gas composition.The quantitative relationship between spectral line intensity and molecular abundance ratio was developed over a large molecular abundance ratio range.The influence of laser ablation energy and substrate material on gas quantitative calibration measurement is also analyzed.The proposed metal-assisted method makes the measurement of gases’molecular abundance ratios possible with an FO-LIBS system.
基金supported by the National Natural Science Foundation of China(Nos.11474133,61235005,61210006,and61275075)the Guangdong Natural Science Foundation(No.S2013030013302)the BJTU Fundamental Research Funds(No.2014RC016)
文摘We present a theoretical analysis and an experimental study of the impacts of external optical feedback on dualfrequency fiber lasers. The external optical feedback can effectively suppress the phase noise of the beat notes of dual-frequency fiber lasers, provided some requirements are satisfied. The polarization of the optical feedback is important for the fiber laser's stability, and it can also tune the beat note frequency. A side effect of external optical feedback, as demonstrated in the experiments, is lowering the sensitivity of the dual-frequency fiber laserbased sensors, although such degradation is not obvious.
基金supported in part by the Zhejiang Province Science and Technology Plan Projects(No.LGG19F050001)the National Natural Science Foundation of China(No.601705055)the Zhejiang Provincial Natural Science Foundation of China(No.LY17F050012)。
文摘We experimentally discussed the output characteristics of a passively mode-locked erbium-doped fiber laser using a single-mode fiber(SMF)structure as a saturable absorber(SA)based on nonlinear optic loop mirror(NOLM).The NOLM acting as an SA has properties of controllable pulse interval and pulse width.Four different types of NOLMs are experimentally discussed and the results show that fine adjustment to the coupler ratio together with optimization of the SMF length inside the NOLM can simultaneously implement high pulse energy and pulse internal tunability.The laser configuration provides a method to generate well-performing mode-locked lasing,and the investigations of the effects of changing some parameters of the laser also provide some help for the development of mode-locked fiber laser based on NOLM.
基金supported by the Nature Science Foundation of Chongqing(No.cstc2018jcyjAX0585)。
文摘We report a Tm-doped noise-like mode-locked(NLML)pulsed fiber laser with a compact linear cavity which consists of dual nonlinear optical loop mirrors(NOLMs).The design of dual-NOLM shows both exceptional compactness in construction and distinct flexibility.In this laser,mode-locking can be realized through the nonlinear optical loop mirror technique.Stable noise-like mode-locked pulses with spectral bandwidth of 29.18 nm and pulse energy of 46 nJ are generated at a central wavelength of 1999.7 nm.Our results indicate that such a simple and inexpensive structure can pave the way for the development of generating supercontinuum with desirable performance.
基金supported by Huo Yingdong Education Foundation(No.151062)Hunan Provincial Innovation Construct Project(No.2019RS3017)National Natural Science Foundation of China(Nos.11704409 and 61605246)。
文摘We report a 2 kW all-fiberized Raman fiber amplifier with efficient brightness enhancement based on the graded-index fiber.The maximum power output reaches up to 2.034 kW centered at 1130 nm,with a conversion efficiency of 79.35%with respect to the injected pump power.To the best of our knowledge,this is the highest conversion efficiency obtained for any Raman laser system using graded-index fiber.An optimized fiber combiner adopting graded-index fiber as the pigtail fiber was fabricated,enabling the preservation of the seeding brightness in the core-pumped Raman fiber amplifier,and further enhancing the ultimate brightness of the output laser after amplification.At the maximum power output,the beam quality parameter M2 is 2.8,corresponding to a signal-to-pump brightness enhancement factor of 11.2.As far as we know,we obtain the highest brightness enhancement among Raman fiber lasers of over 100 W,and the best beam quality for graded-index Raman fiber lasers of over 150 W.
文摘Asymmetrical bound solitons train with pulsewidth of 103fs and separation of 585.5fs without any CW components are observed from Figure-8 passive mode locked fiber laser, the separation and pulsewidth keep unchanged even after 1.2Km SMF.
