Tahara Tatsuki, Arai Yasuhiko
Appl Opt. 2017 May 1;56(13):F200-F204. doi: 10.1364/AO.56.00F200.
We propose single-shot multiwavelength digital holography with an extremely large incident angle and show the digital recording of multiple object waves at multiple wavelengths with an angle of more than 40 degrees and no beam combiner to generate interference light. Both the avoidance of the crosstalk between the object waves at different wavelengths and the space-bandwidth extension are simultaneously achieved with a single-shot exposure of a monochromatic image sensor and a reference beam even when the wavelength difference between the object waves is small. An extremely large angle can be set by utilizing the signal theory. An angle of up to 40.6 degrees was introduced, interference fringes with an 818 nm period at the wavelength of 532 nm were generated, and an image sensor recorded a two-wavelength-multiplexed hologram. Resolution improvement was experimentally demonstrated using two-wavelength digital holography with the wavelengths of 640 and 532 nm.
我们提出了一种具有极大入射角的单次多波长数字全息术，展示了在不使用光束组合器来产生干涉光的情况下，以超过40度的角度对多个波长的多个物波进行数字记录。即使不同波长物波之间的波长差很小，通过单色图像传感器和参考光束的单次曝光，也能同时实现不同波长物波之间串扰的避免和空间带宽扩展。利用信号理论可以设置极大的角度。引入了高达40.6度的角度，在532 nm波长处产生了周期为818 nm的干涉条纹，图像传感器记录了双波长复用全息图。通过使用波长为640和532 nm的双波长数字全息术，实验证明了分辨率的提高。
