Torregrosa A J, Maestre H, Capmany J
Opt Lett. 2015 Nov 15;40(22):5315-8. doi: 10.1364/OL.40.005315.
We report an image wavelength upconversion system. The system mixes an incoming image at around 1550 nm (eye-safe region) illuminated by an amplified spontaneous emission (ASE) fiber source with a Gaussian beam at 1064 nm generated in a continuous-wave diode-pumped Nd(3+):GdVO(4) laser. Mixing takes place in a periodically poled lithium niobate (PPLN) crystal placed intra-cavity. The upconverted image obtained by sum-frequency mixing falls around the 631 nm red spectral region, well within the spectral response of standard silicon focal plane array bi-dimensional sensors, commonly used in charge-coupled device (CCD) or complementary metal-oxide-semiconductor (CMOS) video cameras, and of most image intensifiers. The use of ASE illumination benefits from a noticeable increase in the field of view (FOV) that can be upconverted with regard to using coherent laser illumination. The upconverted power allows us to capture real-time video in a standard nonintensified CCD camera.
我们报道了一种图像波长上转换系统。该系统将由放大自发辐射（ASE）光纤源照射的、波长约为1550nm（对眼睛安全的区域）的输入图像与连续波二极管泵浦Nd(3+):GdVO(4)激光器产生的1064nm高斯光束混合。混合在腔内放置的周期极化铌酸锂（PPLN）晶体中进行。通过和频混合获得的上转换图像落在631nm的红色光谱区域附近，该区域完全在标准硅焦平面阵列二维传感器的光谱响应范围内，这些传感器常用于电荷耦合器件（CCD）或互补金属氧化物半导体（CMOS）摄像机以及大多数图像增强器中。与使用相干激光照明相比，使用ASE照明的好处是可上转换的视场（FOV）显著增加。上转换功率使我们能够在标准的非增强型CCD相机中捕获实时视频。
