The State Key Laboratory of Transient OpticsTechnology is attached to the Xi’an Institute ofOptics and Precision Mechanics of the CAS. The Laboratory is devoted to study of the theory and technology of transient opti...The State Key Laboratory of Transient OpticsTechnology is attached to the Xi’an Institute ofOptics and Precision Mechanics of the CAS. The Laboratory is devoted to study of the theory and technology of transient optics. Its research fields include concepts and technologies of ultrashort pulse generation, amplification, compression and measurement, ultrafast processes of interaction between light and matter, development, and application of measurement equipment of transient optics for scientific research and production. At present, its research activities are the following:展开更多
An adaptive optics （AO） system based on a stochastic parallel gradient descent （SPGD） algorithm is proposed to reduce the speckle noises in the optical system of a stellar coronagraph in order to further improve t...An adaptive optics （AO） system based on a stochastic parallel gradient descent （SPGD） algorithm is proposed to reduce the speckle noises in the optical system of a stellar coronagraph in order to further improve the contrast. The principle of the SPGD algorithm is described briefly and a metric suitable for point source imaging optimization is given. The feasibility and good performance of the SPGD algorithm is demonstrated by an experimental system featured with a 140-actuator deformable mirror and a Hartrnann-Shark wavefront sensor. Then the SPGD based AO is applied to a liquid crystal array （LCA） based coronagraph to improve the contrast. The LCA can modulate the incoming light to generate a pupil apodization mask of any pattern. A circular stepped pattern is used in our preliminary experiment and the image contrast shows improvement from 10^-3 to 10^-4.5 at an angular distance of 2A/D after being corrected by SPGD based AO.展开更多
The transportable optical clock can be deployed in various transportation vehicles,including aviation,aerospace,maritime,and land-based vehicles;provides remote time standards for geophysical monitoring and distribute...The transportable optical clock can be deployed in various transportation vehicles,including aviation,aerospace,maritime,and land-based vehicles;provides remote time standards for geophysical monitoring and distributed coherent sensing;and promotes the unmanned and lightweight development of global time network synchronization.However,the current transportable version of laboratory optical clocks is still limited by factors such as environmental sensitivity,manual maintenance requirements,and high cost.Here we report a single-person portable optical frequency standard using the recently proposed atomic-filter-based laser“Voigt laser”as the local oscillator.It is worth mentioning that due to the inherent characteristics of Voigt lasers,the Voigt optical frequency standard can maintain turn-key functionality under harsh environmental impacts without any manual maintenance requirement.In our experiment,conducted over a duration of 12 min,we subjected the laser diode to multiple temperature shocks,resulting in a cumulative temperature fluctuation of 15℃.Following each temperature shock event,the Voigt optical frequency standard automatically relocked and restored the frequency output.Therefore,this demonstration marks a significant technological breakthrough in automatic quantum devices and might herald the arrival of fully automated time network systems.展开更多
A new generation of storage ring-based light sources, called diffraction-limited storage rings（DLSR）, with emittance approaching the diffraction limit for multi-ke V photons by using multi-bend achromat lattice, has...A new generation of storage ring-based light sources, called diffraction-limited storage rings（DLSR）, with emittance approaching the diffraction limit for multi-ke V photons by using multi-bend achromat lattice, has attracted worldwide and extensive studies of several laboratories, and been seriously considered as a means of upgrading existing facilities in the imminent future. Among various DLSR proposals, the PEPX design demonstrated that it is feasible to achieve sufficient ring acceptance for off-axis injection in a DLSR, by designing the lattice based on the ‘thirdorder achromat’ concept and with a special high-beta injection section. For the High Energy Photon Source（HEPS）planned to be built in Beijing, a PEPX-type lattice has been designed and continuously improved. In this paper, we report the evolution of the PEPX-type design for HEPS, and discuss the main issues relevant to the linear optics design and nonlinear optimization.展开更多
文摘The State Key Laboratory of Transient OpticsTechnology is attached to the Xi’an Institute ofOptics and Precision Mechanics of the CAS. The Laboratory is devoted to study of the theory and technology of transient optics. Its research fields include concepts and technologies of ultrashort pulse generation, amplification, compression and measurement, ultrafast processes of interaction between light and matter, development, and application of measurement equipment of transient optics for scientific research and production. At present, its research activities are the following:
基金Supported by the National Natural Science Foundation of China(Grant Nos. 10873024 and 11003031)supported by the National Science Foundation under Grant ATM-0841440
文摘An adaptive optics （AO） system based on a stochastic parallel gradient descent （SPGD） algorithm is proposed to reduce the speckle noises in the optical system of a stellar coronagraph in order to further improve the contrast. The principle of the SPGD algorithm is described briefly and a metric suitable for point source imaging optimization is given. The feasibility and good performance of the SPGD algorithm is demonstrated by an experimental system featured with a 140-actuator deformable mirror and a Hartrnann-Shark wavefront sensor. Then the SPGD based AO is applied to a liquid crystal array （LCA） based coronagraph to improve the contrast. The LCA can modulate the incoming light to generate a pupil apodization mask of any pattern. A circular stepped pattern is used in our preliminary experiment and the image contrast shows improvement from 10^-3 to 10^-4.5 at an angular distance of 2A/D after being corrected by SPGD based AO.
基金Innovation Program for Quantum Science and Technology(2021ZD0303200)National Natural Science Foundation of China(62405007,624B2010)+1 种基金China Postdoctoral Science Foundation(BX2021020)Wenzhou Major Science and Technology Innovation Key Project(ZG2020046)。
文摘The transportable optical clock can be deployed in various transportation vehicles,including aviation,aerospace,maritime,and land-based vehicles;provides remote time standards for geophysical monitoring and distributed coherent sensing;and promotes the unmanned and lightweight development of global time network synchronization.However,the current transportable version of laboratory optical clocks is still limited by factors such as environmental sensitivity,manual maintenance requirements,and high cost.Here we report a single-person portable optical frequency standard using the recently proposed atomic-filter-based laser“Voigt laser”as the local oscillator.It is worth mentioning that due to the inherent characteristics of Voigt lasers,the Voigt optical frequency standard can maintain turn-key functionality under harsh environmental impacts without any manual maintenance requirement.In our experiment,conducted over a duration of 12 min,we subjected the laser diode to multiple temperature shocks,resulting in a cumulative temperature fluctuation of 15℃.Following each temperature shock event,the Voigt optical frequency standard automatically relocked and restored the frequency output.Therefore,this demonstration marks a significant technological breakthrough in automatic quantum devices and might herald the arrival of fully automated time network systems.
基金Supported by NSFC(11475202,11405187)Youth Innovation Association of Chinese Academy of Sciences(2015009)
文摘A new generation of storage ring-based light sources, called diffraction-limited storage rings（DLSR）, with emittance approaching the diffraction limit for multi-ke V photons by using multi-bend achromat lattice, has attracted worldwide and extensive studies of several laboratories, and been seriously considered as a means of upgrading existing facilities in the imminent future. Among various DLSR proposals, the PEPX design demonstrated that it is feasible to achieve sufficient ring acceptance for off-axis injection in a DLSR, by designing the lattice based on the ‘thirdorder achromat’ concept and with a special high-beta injection section. For the High Energy Photon Source（HEPS）planned to be built in Beijing, a PEPX-type lattice has been designed and continuously improved. In this paper, we report the evolution of the PEPX-type design for HEPS, and discuss the main issues relevant to the linear optics design and nonlinear optimization.
