8 November 2017 High-resolution terahertz inline digital holography based on quantum cascade laser
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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    μ m , 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 N x and N y 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    μ m opens the door for many imaging experiments. It will turn the THz imaging systems into applications.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Qinghua Deng, Qinghua Deng, Weihua Li, Weihua Li, Xuemin Wang, Xuemin Wang, Zeyu Li, Zeyu Li, Haochong Huang, Haochong Huang, Changle Shen, Changle Shen, Zhiqiang Zhan, Zhiqiang Zhan, Ruijiao Zou, Ruijiao Zou, Tao Jiang, Tao Jiang, Weidong Wu, 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 . Submission: Received: 10 June 2017; Accepted: 28 September 2017
Received: 10 June 2017; Accepted: 28 September 2017; Published: 8 November 2017
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