Manganese nodules, widely distributed across the deep-sea floor, are emerging as a significant potential mineral resource. Addressing the need for improved exploration and classification methods, this study explores t...
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A compact single-frequency nanosecond fiber & solid-state hybrid lasersystem at 1030 nm is presented. The seed source, a continuous wave distributed feedback (DFB) laser diode, was first externally modulated with...
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In this work,polarization mode dispersion(PMD)in polarization-maintaining(PM)fibers,to the best of our knowledge,is first proposed and experimentally proved to be responsible for severe spectral modulations in ultrafa...
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In this work,polarization mode dispersion(PMD)in polarization-maintaining(PM)fibers,to the best of our knowledge,is first proposed and experimentally proved to be responsible for severe spectral modulations in ultrafast PM fiber amplifiers,the introduction of which can give reasonable explanation for the dense spectral ripples imposed on the spectra of amplified lasers from the commonly used all-PM-fiber or hybrid“PM-fiber+bulk crystal”amplifiers,including both high-power amplifiers with remarkable nonlinear effects(self-phase modulation,SPM)and even low-power amplifiers with negligible nonlinear effects.
We investigate the ultrafast carrier and phonon dynamics in the ferrimagnetic semiconductor Mn3Si2Te6 using time-resolved optical pump-probe spectroscopy. Our results reveal that the electron-phonon thermalization pro...
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We investigate the ultrafast carrier and phonon dynamics in the ferrimagnetic semiconductor Mn3Si2Te6 using time-resolved optical pump-probe spectroscopy. Our results reveal that the electron-phonon thermalization process with a subpicosecond timescale is prolonged by the hot-phonon bottleneck effect. We identify the subsequent relaxation processes associated with two nonradiative recombination mechanisms, i.e., phonon-assisted electron-hole recombination and defect-related Shockley-Read-Hall recombination. Temperature-dependent measurements indicate that all three relaxation components show large variation around 175 and 78 K, which is related to the initiation of spin fluctuation and ferrimagnetic order in Mn3Si2Te6. In addition, two pronounced coherent optical phonons are observed, in which the phonon with a frequency of 3.7 THz is attributed to the A1g mode of Te precipitates. Applying the strain pulse propagation model to the coherent acoustic phonons yields a penetration depth of 506 nm and a sound speed of 2.42 km/s in Mn3Si2Te6. Our results develop understanding of the nonequilibrium properties of the ferrimagnetic semiconductor Mn3Si2Te6 and also shed light on its potential applications in optoelectronic and spintronic devices.
Hydrographic Lidar has the potential to provide full spatial coverage, high accuracy and high spatial density water altimetric and bathemetric measurements, which increase many applications in hydrology, geomorphology...
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A novel wired and wireless hybrid access system based on self-homodyne and heterodyne technology is presented in this paper. With the 16 Quadrature Amplitude Modulation(16QAM) and optimized self-homodyne mechanism, th...
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A red laser diode (LD) pumped single-longitudinal-mode (SLM) short-pulsed Alexandrite laser with a pulse duration of a few nanoseconds is presented, in which the cavity-dumping technique is for the first time, to our ...
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Highly sensitive terahertz frequency upconversion detection was demonstrated with a KTiOAsO4 crystal. The detectable THz frequency ranges were 3.6-3.9, 4.2-4.4, and 4.8-5.0 THz. The minimum detectable terahertz energy...
We report on a high-efficiency,high-power tandem Ho:YAG single-crystal fiber(SCF)laser in-band pumped by a Tm-doped fiber laser at 1907 *** addition to the uniform heat distribution resulting from the large surface-to...
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We report on a high-efficiency,high-power tandem Ho:YAG single-crystal fiber(SCF)laser in-band pumped by a Tm-doped fiber laser at 1907 *** addition to the uniform heat distribution resulting from the large surface-to-volume ratio of this fiber-like thin-crystal rod,the long gain region provided by the tandem layout of two SCFs enables high lasing efficiency and power handling *** than 100 W output power is achieved at 2.1μm,corresponding to a slope efficiency of 70.5%and an optical-to-optical efficiency of 67.6%.To the best of our knowledge,this is the highest output power and efficiency ever reported from SCF lasers in the 2-μm spectral range.
We present a tunable, high-repetition-rate mid-infrared vortex laser based on ZnGeP2 (ZGP) optical parametric oscillator (OPO) with a singly resonant plane-parallel cavity which was pumped by a 2.1 μm vortex laser. T...
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