Author Affiliations
Heilongjiang Provincial Key Laboratory of Quantum Control, School of Measurement and Communication Engineering, Harbin University of Science and Technology, Harbin 150080, Chinashow less
Fig. 1. LG spectra of input signal and amplified signal pumped by Gaussian and flattop beams. (a) and (b) show the cases of wp = ws, 2ws, and 3ws for IGe4,0 and IGo4,2 signals at gain of 2, respectively. (c) LG spectra with different gain factors at wp = 3ws.
Fig. 2. Diagram of the OPA experimental setup, where the key components include the mirror (M), lenses (L1-L7), polarizing beam splitter (PBS), half-wave plate (HWP), spatial light modulator (SLM), spatial filter (SF), beam profiler (CMOS), and dichroic mirror (DM).
Fig. 3. Simulated and experimentally observed results of the OPA pumped by a Gaussian beam, where (a) shows the IG signal profiles; (b) and (c) are corresponding amplified signal profiles with wp = ws, 2ws, respectively.
Fig. 4. Results of the OPA pumped by a flattop beam, where (a)–(c) show the theoretical beam profiles, the measured signals, and the corresponding amplified signals, respectively; (d) comparison of the far-field amplified light and the input signal obtained via experimental observation.
Fig. 5. Measured amplified signal energy and gain factor versus the input signal energy for IG-mode OPA. Inset, the overlap of the pump, IGe4,0, and IGo4,2 signals.