Volume 11 Issue 4
Jul.  2018
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Chinese Optics  > 2018  >  11(4): 582-589.
LU Zheng-wei, SHAO Shuai, MA Ya-kun. Design of a composite laser beam expander without obscuration[J]. Chinese Optics, 2018, 11(4): 582-589. doi: 10.3788/CO.20181104.0582
Citation: LU Zheng-wei, SHAO Shuai, MA Ya-kun. Design of a composite laser beam expander without obscuration[J]. Chinese Optics, 2018, 11(4): 582-589. doi: 10.3788/CO.20181104.0582
shu

Design of a composite laser beam expander without obscuration

  • 1.

    Changchun Institute of Optics, Fine Mechanics and physics, Chinese Academy of sciences, Changchun 130033, China

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China

Funds:

the 3rd Innovation Project of CAS 09J52SCN90

More Information
  • Corresponding author: SHAO Shuai, E-mail:shaoshuaiciomp@163.com
  • Received Date: 01 Dec 2017
  • Rev Recd Date: 01 Feb 2018
  • Publish Date: 01 Aug 2018
    Abstract
  • In order to meet the requirements of high-power laser emission, a large-diameter composite laser beam expander without central obscuration based on Cassegrain system is proposed to eliminate the central obscuration of the Cassegrain system and improve the laser emission efficiency. Based on the principle of the Cassegrain system and its structural characteristics, combined with the characteristics of the Galileo refraction type beam expander, a composite laser beam expander without central obscuration with an emission aperture of 550 mm is designed. Using a combination of a reflective beam expander and a refractive beam expander, a through hole is opened in the center of the Cassegrain secondary mirror so that the center is passed through the obscured laser. The rear side is connected to a Galileo-type refracting beam expander, which expands the beam transmitted through the center, and the two beams are emitted coaxially. The laser transmittance test is carried out on a new type of composite beam expander. The experimental results show that for the laser of 10.6 μm wavelength, the transmittance is more than 95.21%, which is 22.12% higher than that of the traditional Cassegrain beam expander.

     

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