Hisatake Shintaro, Tada Keiji, Nagatsuma Tadao
Division of Advanced Electronics and Optical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
Opt Express. 2010 Mar 1;18(5):4748-57. doi: 10.1364/OE.18.004748.
We demonstrate the generation of an optical frequency comb (OFC) with a Gaussian spectrum using a continuous-wave (CW) laser, based on spatial convolution of a slit and a periodically moving optical beam spot in a linear time-to-space mapping system. A CW optical beam is linearly mapped to a spatial signal using two sinusoidal electro-optic (EO) deflections and an OFC is extracted by inserting a narrow spatial slit in the Fourier-transform plane of a second EO deflector (EOD). The spectral shape of the OFC corresponds to the spatial beam profile in the near-field region of the second EOD, which can be manipulated by a spatial filter without spectral dispersers. In a proof-of-concept experiment, a 16.25-GHz-spaced, 240-GHz-wide Gaussian-envelope OFC (corresponding to 1.8 ps Gaussian pulse generation) was demonstrated.
我们展示了一种基于线性时间到空间映射系统中狭缝与周期性移动光束光斑的空间卷积，利用连续波（CW）激光器生成具有高斯光谱的光学频率梳（OFC）的方法。连续波光束通过两次正弦电光（EO）偏转被线性映射为空间信号，并且通过在第二个电光偏转器（EOD）的傅里叶变换平面中插入一个窄空间狭缝来提取OFC。OFC的光谱形状对应于第二个EOD近场区域中的空间光束轮廓，其可以通过空间滤波器进行操控而无需光谱色散器。在概念验证实验中，展示了一个频率间隔为16.25 GHz、带宽为240 GHz的高斯包络OFC（对应于1.8 ps高斯脉冲生成）。
