A dual-beam platform is developed for all-optical Thomson/Compton scattering, with versatile parameter tuning capabilities including electron energy, radiation energy, radiation polarization, et

A dual-beam platform is developed for all-optical Thomson/Compton scattering, with versatile parameter tuning capabilities including electron energy, radiation energy, radiation polarization, etc. By integrating this platform with a 200 TW Ti: Sapphire laser system, we demonstrate the generation of inverse Compton scattering X/gamma-rays with tunable energies ranging from tens of keV to MeV. The polarization of X/gamma-rays is manipulated by adjusting the polarization of the scattering laser. In the near future, by combining this platform with multi-PW laser facilities, our goal is to explore the transition from nonlinear Thomson scattering to nonlinear Compton scattering, ultimately verifying theories related to strong-field quantum electrodynamics effects induced by extreme scattering.show less

Fiber-coupled laser pumps with Size,Weight and Power consumption(Swap) become more and more compelling for applications in both industrial and defense applications. This study presents an innova

Fiber-coupled laser pumps with Size,Weight and Power consumption(Swap) become more and more compelling for applications in both industrial and defense applications. This study presents an innovative approach employing spectral beam combining (SBC) technique and double-junction laser diode chips to create efficient, high-power,high-brightness f iber-coupled packages. We successfully demonstrate a wavelength-stabilized pump module capable of delivering over 560 W of ex-fiber power with an electro-optical conversion efficienc(PCE) of 55 % from a 135 µm diameter, 0.22NA f iber. The specific mass and volume metrics achieved are 0.34 kg/kW and 0.23 cm3/W, respectively. The module exhibits a consistent spectral peak interval of approximately 3.6 nm and a full width at half maximum (FWHM) across a wide range of operating currents.show less

Optical neural networks have emerged as feasible alternatives to their electronic counterparts, offering significant benefits such as low power consumption, low latency, and high parallelism. Ho

Optical neural networks have emerged as feasible alternatives to their electronic counterparts, offering significant benefits such as low power consumption, low latency, and high parallelism. However, the realization of ultra-compact nonlinear deep neural network and multi-thread processing remain crucial challenge for optical computing. Here, we present a monolithically integrated all-optical nonlinear diffractive deep neural network (AON-D2NN) chip for the first time. The all-optical nonlinear activation function is implemented using germanium microstructures, which provide low loss and are compatible with the standard silicon photonics fabrication process. Assisted by the germanium activation function, the classification accuracy is improved by 9.1% for four-classification tasks. Additionally, the chip’s reconfigurability enables multi-task learning in-situ via an innovative cross-training algorithm, yielding two task-specific inference results with accuracies of 95% and 96%, respectively. Furthermore, leveraging the wavelength-dependent response of chip, the multi-thread nonlinear optical neural network is implemented for the first time, capable of handling two different tasks in parallel. The proposed AON-D2NN contains three hidden layers with a footprint of only 0.73 mm2. It can achieve ultra-low latency (172 ps), paving the path for realizing high-performance optical neural networks.show less

We propose and demonstrate experimentally a tunable filter based on Mach-Zehnder interference (MZI) assisted micro-ring resonator (MRR) formed on lithium niobate on insulator (LNOI) platform. Ou

We propose and demonstrate experimentally a tunable filter based on Mach-Zehnder interference (MZI) assisted micro-ring resonator (MRR) formed on lithium niobate on insulator (LNOI) platform. Our proposed filter can achieve electro-optic (EO) and thermo-optic (TO) tuning for the bandwidth and the dip wavelength simultaneously. Our typically fabricated filter shows that the minimum and maximum 3-dB bandwidths at Through Port are 27.86 GHz and 31.74 GHz, respectively, while at Drop Port, these values are 14.68 GHz and 30.69 GHz. Meanwhile, the TO and EO tuning rates of the dip wavelength are approximately −6.5 pm/mW and −65.09 pm/V, respectively. Our proposed filter has the potential to be used in optical communication and optical information processing systems to achieve multifunctional filtering characteristics.show less