FM-to-AM conversion in angular filtering based on transmitted volume Bragg gratings 
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1 School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, China
2 Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
3 Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Laboratory of Modern Optical Technologies of Ministry of Education, Suzhou 215006, China
Figures & Tables
Fig. 1. Frequency spectrum filtered by the TBGs and the FM-to-AM conversion: (a) and (b) TBG-1, (c) and (d) TBG-2, (e) and (f) TBG-3, (g) and (h) TBG-4.
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Fig. 2. Dependence of the distortion criterion on the bandwidth.
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Fig. 3. Dependence of the Bragg selectivity on the grating period and thickness: (a) $\unicode[STIX]{x1D706}_{0}=1053$ nm, $d=2.5$ mm, $\unicode[STIX]{x1D719}=90^{\circ }$; (b) $\unicode[STIX]{x1D706}_{0}=1053$ nm, $\unicode[STIX]{x1D6EC}=1.5~\unicode[STIX]{x03BC}\text{m}$, $\unicode[STIX]{x1D719}=90^{\circ }$.
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Fig. 4. Bragg selectivity for TBG-3, TBG-3-O, TBG-4 and TBG-4-O.
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Fig. 5. Frequency spectrum filtered by optimized TBGs and the FM-to-AM conversion: (a) and (b) TBG-3-O, (c) and (d) TBG-4-O.
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Fig. 6. Dependence of the distortion criterion on the number of TBGs.
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Fig. 7. Schematic diagram demonstrating FM-to-AM conversion on TBGs.
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Fig. 8. Fluctuation of the inclined laser pulse.
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Fig. 9. Frequency spectra filtered by TBGs and temporal profiles of the laser pulses: (a) and (b) TBG-I, (c) and (d) TBG-II, (e) and (f) TBG-III.
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Table1. Structural parameters of TBGs.
| | | | Cutoff | | |
|---|
| Period | Thickness | Modulation | frequency | Bandwidth | DE |
|---|
| () | (mm) | () | (mrad) | (nm) | (%) |
|---|
| TBG-1 | 1.88 | 2.0 | 258 | 0.84 | 4.50 | 100 | | TBG-2 | 1.17 | 2.5 | 177 | 0.41 | 1.35 | 100 | | TBG-3 | 1.08 | 3.3 | 157 | 0.28 | 0.87 | 100 | | TBG-4 | 0.97 | 4.0 | 129 | 0.21 | 0.60 | 100 |
|
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Table2. Optimized structural parameters of TBG-3 and TBG-4.
| Period | Thickness | Modulation | Bandwidth |
|---|
| () | (mm) | () | (nm) |
|---|
| TBG-3-O | 2.62 | 8.0 | 65 | 2.20 | | TBG-4-O | 3.64 | 15.0 | 35 | 2.28 |
|
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Table3. Structural parameters of the TBGs in the experiment.
| | | | | Cutoff | |
|---|
| Wavelength | Period | Thickness | Bandwidth | frequency | DE |
|---|
| (nm) | | (mm) | (nm) | (mrad) | (%) |
|---|
| TBG-I | 1053 | 3.49 | 3.54 | 8.70 | 1.285 | 96.9 | | TBG-II | 1053 | 1.25 | 3.83 | 1.00 | 0.487 | 94.0 | | TBG-III | 1053 | 1.10 | 4.09 | 0.75 | 0.376 | 91.0 |
|
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Table4. Results of the distortion criterion $\unicode[STIX]{x1D6FC}$.
| Incident | After TBG-I | After TBG-II | After TBG-III |
|---|
| pulse (%) | (%) | (%) | (%) |
|---|
| Experimental results | 12.8 | 13.6 | 28.4 | 42.5 | | Theoretical results | | 13.3 | 26.9 | 39.6 |
|
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Fan Gao, Baoxing Xiong, Xiang Zhang, Xiao Yuan. FM-to-AM conversion in angular filtering based on transmitted volume Bragg gratings[J]. High Power Laser Science and Engineering, 2019, 7(2): 02000e34.
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