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The no-cloning theorem states that an unknown quantum state cannot be cloned exactly and deterministically. However, this limit can be circumvented by abandoning determinism and using probabilistic methods. Here, we report an experimental demonstration of probabilistic cloning of arbitrary coherent states that clearly surpasses the no-cloning limit. Our scheme is based on a hybrid linear amplifier...
An ultrathin double-focusing lens, capable of simultaneously generating a plasmonic focus in the near-field region and a Fresnel-z one-plate based diffraction-limited focal spot in the far-field region, was designed using three-dimensional topological insulator (Sb2Te3). Our innovative double-focusing flat lens opens new opportunities for future compact devices with versatile functionalities, with...
We present studies of two kinds of hybrid plasmonic annular resonators with different cross-sectional shapes of circle and square. Their performance as defined by the Q/V ratio is enhanced considerably with a reduction in their physical dimensions. There exists critical annular radii below which “circle ring” outperforms “square ring”.
Laser amplifiers based on the thin-rod (“single-crystal fiber”) and thin-tapered-rod Yb:YAG active elements are developed and tested. The ability of applying the new broadband Yb-doped materials in the thin-rod geometry is discussed and such active elements will be tested soon.
We report the distributed measurement of supercontinnum generation along highly nonlinear optical fibers with centimeter spatial resolution using photon-counting optical time-domain reflectometry.
We propose and demonstrate a new method for the characterization of nonlinear multimode integrated devices that reconstruct the biphoton state produced trough spontaneous parametric down-conversion (SPDC) using classical sum-frequency generation measurements. The proposed method is experimentally demonstrated by predicting the state generated from a multi-channel integrated nonlinear waveguide device.
Trivalent cerium ions doped silica materials can be utilized as scintillator to detect ionizing radiation. At the same time, the damage induced by ionizing radiation can also influence the luminescence properties of Ce3+. In our research, we present the photoluminescence (PL) properties of Ce3+-doped silica materials prepared by sol-gel method after irradiation by 60Co gamma rays. The results show...
Femtosecond operation of passively mode-locked Nd, La:CaF2 and Nd, La:SrF2 lasers pumped by low power laser diodes at 790 nm was investigated. The continuous trains of pulses with pulse duration of 783 fs at 1065 nm and 747 fs at 1060nm were obtained in resonators without GVD compensation in both cases for absorbed pump power lower than 1W.
A single frequency erbium-doped fiber laser with an on-chip high-Q silicon nitride (Si3N4) microring cavity is demonstrated. The laser linear cavity is composed of a microring with a Q of up to 2.5×105 and a free spectral range (FSR) of 2 nm, a 12 cm erbium-doped fiber and a fiber Bragg grating (FBG). The linewidth of 8 kHz is achieved.
We demonstrate cascade link multi-wavelength digital holography using optical frequency comb referenced synthesizer. This system expands the dynamic range of height in digital holography. In the experiment, 4 synthesized wavelengths and a single wavelength were cascaded, and steps of 10 mm and 21 μm are measured.
An As2Se3-based photonic quasi-crystal fiber (PQF) with high nonlinearity and birefringence is proposed. With femtosecond pulses at a wavelength of 2.94 μm as the pump pulses, mid-infrared broadband polarized supercontinuum is obtained in a 15 mm PQF. The spectral width of x-polarization and j-polarization covers from 1μm ∼10.2 μm and 1μm ∼12.5 μm, respectively.
We have been developing an all fiber type oscillator [1] that generates ultrashort pulses with a wavelength of 1064 nm and a pulse width of 500 fs or less. The oscillator is based on the passive mode locking using SESAM.
Optical fiber couplers with ∼300nm waist diameter are used as compact temperature sensors from room temperature to 661oC, showing an average temperature sensitivity of 55 pm/oC and a maximum sensitivity of 60pm/ oC at the highest temperature.
Terahertz wave transmission could be optically controlled based on electron accumulation at the interface of a hybrid structure of Si and CH3NH3PbI3 perovskite. The modulation efficiency was enhanced by a factor of approximately 4 than those at bare Si under a low irradiance of 532-nm continuous laser (<0.5 W/cm2). Based on THz time-domain spectroscopy and Drude modeling, we characterized the optical...
We demonstrated vortex beam conversion by a resonant with intra-cavity spiral phase plate (SPP). It generated a clean single Laguerre-Gaussian (LG) beam carrying orbital angular momentum (OAM) corresponding to the topological charge of the SPP as we had predicted by investigating the cavity dynamics with modified Markov chains that takes into account the selection rules from the conservation of resonance...
A novel method is proposed to effectively enhance the extraordinary optical transmission through a nano-slit. The hybrid state of Tamm plasmon polaritons (TPPs) and the surface plasmon polaritons (SPPs) can be excited. The excitation efficiency of SPPs can be improved significantly. A high transmittance through the single nano-slit is achieved.
We report on a diode-pumped Kerr-lens mode-locked Yb:CYA laser. Average power as high as 1.5 W was obtained with pulse duration of 68 fs at central wavelength of 1040nm.
A novel non-wearable respiration monitoring smart mat structure embedded with optical fiber sensor is proposed and experimentally investigated, which can effectively detect the breathing rate (BR) of human subjects in sleeping position. The sensing principle is mainly based on the Mach-Zehnder interferometer (MZI), and the fibers used are all common single mode fibers (SMFs) with 900-micron buffer...
We numerically study the improvements of the spectral bandwidth and intensity stability by applying a minute coherent femtosecond pulse seed on CW pumped supercontinuum generation when the peak power of the seed varies.
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