Search

Your search keyword '"Dongxia, Hu"' showing total 4 results
Start Over Author "Dongxia, Hu" Journal applied optics
4 results on '"Dongxia, Hu"'

1. Beam wavefront control of a thermal inertia laser for inertial confinement fusion application

Author

Wanjun, Dai, Dongxia, Hu, Wei, Zhou, Junpu, Zhao, Feng, Jing, Zeping, Yang, Kun, Zhang, Xuejun, Jiang, Wu, Deng, Runchang, Zhao, Zhitao, Peng, and Bin, Feng

Subjects
Laser beams -- Research, Laser fusion -- Research, Astronomy, Physics
Abstract

A novel scheme to correct aberration of each beam from the front-end to the target point in a thermal inertia laser (TIL) is presented. Each beam contains a deformable mirror (DM) with an aperture of 70 mm x 70 mm at the injection of the main amplifier and a Hartman--Shack (HS) sensor in a parameter diagnostic unit (PDU). A temporary HS sensor for measuring the static aberration of each beam with 1 Hz source is placed at the target point. The sensor will be removed from the target point during the main single shot, so we transfer the results measured at the target point to the sensors in the PDU. Dynamic aberration can also be measured by the HS sensor in the PDU during the single shot. In this way, we need not calibrate the aberration of the PDU, and aberration of each beam can be corrected by the DM with the HS sensor in the PDU. We demonstrate that with this scheme the divergence angle of the TIL pulses can be improved from 100 to less than 60[mu]rad with a focal length of 2200mm and beam size of 290 mm x 290 mm, which meets the requirement of a TIL. OCIS codes: 140.0140, 140.3300, 140.6810.

Published
2009

2. Deformable mirror resolution-matching-based two-stage wavefront sensorless adaptive optics method

Author

Feng Jing, Qiang Yuan, Chuang Sun, Deen Wang, Xuewei Deng, Xin Zhang, Yang Ying, Dongxia Hu, Lei Huang, Yamin Zheng, and Wanjun Dai

Subjects
Wavefront, Physics, Continuous phase modulation, business.industry, Laser, 01 natural sciences, Atomic and Molecular Physics, and Optics, Deformable mirror, Intensity (physics), law.invention, 010309 optics, Optics, law, 0103 physical sciences, Spatial frequency, Electrical and Electronic Engineering, Adaptive optics, Actuator, business, Engineering (miscellaneous)
Abstract

In high-power laser facilities, the application of a traditional wavefront control method is limited under the influence of a continuous phase plate (CPP). In order to obtain a satisfactory far-field intensity distribution at the target of the beamline with the CPP, a novel deformable mirror (DM) resolution-matching-based two-stage wavefront sensorless adaptive optics method is proposed and demonstrated. The principles of the DM resolution-matching method and two-stage wavefront sensorless adaptive optics method are introduced, respectively. Based on the numerical model, the matching relationship between the actuator space of the DM and the spatial period of the CPP is investigated. By using the resolution-matched DM, the feasibility of the two-stage wavefront sensorless adaptive optics method is numerically and experimentally verified. Both the numerical and the experimental results show that the presented DM resolution-matching-based two-stage wavefront sensorless adaptive optics method could achieve the target focal spot control under the influence of the CPP, and the profile and the intensity uniformity of the corrected focal spot are optimized close to the designed ideal focal spot.

Published
2020

3. Polarization smoothing for single beam by a nematic liquid crystal scrambler

Author

Wang Yuancheng, Ying Zhang, Dongxia Hu, Wanguo Zheng, Xiaoxia Huang, Xuewei Deng, Rihong Zhu, and Fang Wang

Subjects
Materials science, business.industry, Single beam, 02 engineering and technology, Plasma, 021001 nanoscience & nanotechnology, Polarization (waves), Laser, 01 natural sciences, Atomic and Molecular Physics, and Optics, Scrambler, law.invention, 010309 optics, Optics, Liquid crystal, law, 0103 physical sciences, Electrical and Electronic Engineering, 0210 nano-technology, business, Engineering (miscellaneous), Inertial confinement fusion, Smoothing
Abstract

Polarization smoothing (PS) is a key approach to suppress laser plasma instabilities (LPI) in inertial confinement fusion (ICF) experiments. Here, we propose a liquid crystal (LC) PS element to realize single beam smoothing and demonstrate its smoothing effect, in principle, with a 2×2 LC polarization checkerboard, which reduces the laser intensity variation in the focal spot to 78.4%. LC PS elements, which have potential applications in high-power ICF laser drivers, have many advantages because they are easy to fabricate, cost effective, flexible, and large.

Published
2017

4. Research on controlling thermal deformable mirror’s influence functions via manipulating thermal fields

Author

Lei Huang, Qiao Xue, Mali Gong, Ping Yan, and Dongxia Hu

Subjects
Convection, Materials science, High power lasers, Field (physics), business.industry, Astrophysics::Instrumentation and Methods for Astrophysics, Atomic and Molecular Physics, and Optics, Deformable mirror, Bimetal, Optics, Thermal, Electrical and Electronic Engineering, business, Adaptive optics, Engineering (miscellaneous), Physics::Atmospheric and Oceanic Physics, Air convection
Abstract

For thermal deformable mirrors (DMs), the thermal field control is important because it will decide aberration correction effects. In order to better manipulate the thermal fields, a simple water convection system is proposed. The water convection system, which can be applied in thermal field bimetal DMs, shows effective thermal fields and influence-function controlling abilities. This is verified by the simulations and the contrast experiments of two prototypes: one of which utilizes air convection, the other uses water convection. Controlling the thermal fields will greatly promote the influence-function adjustability and aberration correction ability of thermal DMs.

Published
2014

Catalog

Books, media, physical & digital resources
See catalog results