Fig. 2: Generation and single-shot capture of stable linear polarization modes.
From: Spatio-temporal-spectral imaging of non-repeatable dissipative soliton dynamics
a Schematic for generating stable LP (linear polarization) modes using single-mode DSs. The output from a SM (single mode) DS mode-locked fiber laser was coupled into a piece of FM (few mode) fiber (~1 m in length) using a scanning mirror and focusing lens. Changing the angle of the scanning mirror could excite different higher-order LP modes, which were then collimated and sent through the RTP channel for STS-CUP imaging. b Representative raw STS-CUP data acquired at a speed of 1 billion frames per second. Two horizontal bands of temporally sheared signal are the complementary views of a multimode DS train with LP21 spatial profile. The inset (dashed box) shows the corresponding temporally integrated image of the same multimode DS train captured by an external CCD camera. c Normalized round-trip DSs in LP01, LP11, and LP21 modes imaged by STS-CUP. Scale bar is 400 µm. d Normalized spatial mean intensity of the reconstructed STS-CUP images vs time plot of the reconstructed LP21 data set. The period of the reconstructed DS train is 62 ns, in excellent agreement with the round-trip time of the single-mode DS laser measured using a fast photodetector.
