Design and development of 24 times high-power laser beam expander

Zhao-heng Lin; Xiu-ming Gong; Shi-bin Wu; Yi Tan; Hong-wei Jing; Zhong-wei Wei

doi:10.1117/12.2034026

17 September 2013 Design and development of 24 times high-power laser beam expander

Zhao-heng Lin, Xiu-ming Gong, Shi-bin Wu, Yi Tan, Hong-wei Jing, Zhong-wei Wei

Proceedings Volume 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications; 89040Y (2013) https://doi.org/10.1117/12.2034026
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

As currently, laser calibration, laser radar, laser ranging and the relative field raised up the demand for high magnification laser beam expander. This article intends to introduce a high-energy laser beam expander research and design, large- diameter, wide-band, high-magnification and small obscuration ratio are the main features. By using Cassegrain reflective optical system, this laser beam expander achieves 24 times beam expand, and outgoing effective limiting aperture is Φ600 mm, band scope between 0.45μm to 5μm, single-pulse laser damage threshold greater than 1J/cm², continuous-wave laser damage threshold greater than 200W/cm² and obscuration ratio 1:10. Primary mirror underside support uses 9 points float supporting, lateral support mainly depends on mercury belt support and assists by mandrel ball head positioning support. An analyzing base on finite element analysis software ANSYS, and primary mirror deformation status analysis with debug mode and operativemode, when inputs four groups of Angle 170°, 180°, 210° and 240° , mercury belt under each group of angle load-bearing is 65%, 75% , 85% and 100% respectively, totally 16 workingcondition analyze results. At last, the best way to support primary mirror is finalized. Through design of secondary mirror to achieve a five-dimensional precision fine-tune. By assembling and debugging laser beam expander, Zygo interferometer detection system proof image quality (RMS) is 0.043λ (λ=632.8nm), stability (RMS) is 0.007λ (λ=632.8nm), and effective transmission hit 94%, meets the requirements of practical application completely.

Citation Download Citation

Zhao-heng Lin, Xiu-ming Gong, Shi-bin Wu, Yi Tan, Hong-wei Jing, and Zhong-wei Wei "Design and development of 24 times high-power laser beam expander", Proc. SPIE 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications, 89040Y (17 September 2013); https://doi.org/10.1117/12.2034026

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