High-resolution terahertz inline digital holography based on quantum cascade laser

Qinghua Deng; Weihua Li; Xuemin Wang; Zeyu Li; Haochong Huang; Changle Shen; Zhiqiang Zhan; Ruijiao Zou; Tao Jiang; Weidong Wu

doi:10.1117/1.OE.56.11.113102

8 November 2017 High-resolution terahertz inline digital holography based on quantum cascade laser

Qinghua Deng, Weihua Li, Xuemin Wang, Zeyu Li, Haochong Huang, Changle Shen, Zhiqiang Zhan, Ruijiao Zou, Tao Jiang, Weidong Wu

Author Affiliations +

Optical Engineering, Vol. 56, Issue 11, 113102 (November 2017). https://doi.org/10.1117/1.OE.56.11.113102

Abstract

A key requirement to put terahertz (THz) imaging systems into applications is high resolution. Based on a self-developed THz quantum cascade laser (QCL), we demonstrate a THz inline digital holography imaging system with high lateral resolution. In our case, the lateral resolution of this holography imaging system is pushed to about 70 μm, which is close to the intrinsic resolution limit of this system. To the best of our knowledge, this is much smaller than what has been reported up to now. This is attributed to a series of improvements, such as shortening the QCL wavelength, increasing Nx and Ny by the synthetic aperture method, smoothing the source beam profile, and diminishing vibration due to the cryorefrigeration device. This kind of holography system with a resolution smaller than 100 μm opens the door for many imaging experiments. It will turn the THz imaging systems into applications.

Citation Download Citation

Qinghua Deng, Weihua Li, Xuemin Wang, Zeyu Li, Haochong Huang, Changle Shen, Zhiqiang Zhan, Ruijiao Zou, Tao Jiang, and Weidong Wu "High-resolution terahertz inline digital holography based on quantum cascade laser," Optical Engineering 56(11), 113102 (8 November 2017). https://doi.org/10.1117/1.OE.56.11.113102

Received: 10 June 2017; Accepted: 28 September 2017; Published: 8 November 2017

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