Effects of Parameters in Smoothing of Multi-Color Spectral Dispersion on Laser-Quad Irradiation Characteristics

Fig. 2. (a) Variation in contrast of focal-spot luminous flux with integral time and (b) FOPAI curves under different dispersion coefficient combinations of sub-beams gratings

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Fig. 3. Effect of CPP on focal spot. (a) One-dimensional distribution of focal spots of two sub-beams with same dispersion direction using different CPPs; (b) intensity distribution of focal spots of laser-quad when sub-beams use same CPPs and different CPPs; (c) FOPAI curves under different C

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Fig. 4. Intensity distributions of focal spot of laser-quad for different combinations and corresponding FOPAI curves. (a) Combination α, C=0.52; (b) combination β, C=0.45; (c) combination γ, C=0.43; (d) FOPAI curves

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Fig. 5. Longitudinal transmission cross-sections of laser beams for different combinations and corresponding longitudinal PSD curves. (a) Combination α; (b) combination β; (c) combination γ; (d) longitudinal PSD curves of different combinations

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Table 1. Combinations of dispersion coefficients of different gratings
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Table 1. Combinations of dispersion coefficients of different gratings
Dispersion coefficientcombination dθ₁/dλ₁ /(μrad·nm^-1) dθ₂/dλ₂ /(μrad·nm^-1) dθ₃/dλ₃ /(μrad·nm^-1) dθ₄/dλ₄ /(μrad·nm^-1)
a 558 558 278 278
b 558 558 418 418
c 558 558 558 558
d 558 558 698 698
e 558 558 838 838

Table 2. Modulation frequency and modulation depth of different grating dispersion coefficient combinations

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Table 2. Modulation frequency and modulation depth of different grating dispersion coefficient combinations

Dispersion coefficientcombination	ν_m /GHz				δ_m
Dispersion coefficientcombination	ν₁	ν₂	ν₃	ν₄	δ₁	δ₂	δ₃	δ₄
a	17.0	17.0	34.0	34.0	2.38	2.38	1.19	1.19
b	17.0	17.0	22.7	22.7	2.38	2.38	1.79	1.79
c	17.0	17.0	17.0	17.0	2.38	2.38	2.38	2.38
d	17.0	17.0	13.6	13.6	2.38	2.38	2.98	2.98
e	17.0	17.0	11.3	11.3	2.38	2.38	3.59	3.59

Table 3. Key unit parameters of multi-color SSD scheme

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Table 3. Key unit parameters of multi-color SSD scheme

Dispersion coefficientcombination	dθ₁/dλ₁ /(μrad·nm^-1)	dθ₂/dλ₂ /(μrad·nm^-1)	dθ₃/dλ₃ /(μrad·nm^-1)	dθ₄/dλ₄ /(μrad·nm^-1)	Type of CPP
α	558	558	558	558	same CPPs
β	558	558	418	418	same CPPs
γ	558	558	418	418	different CPPs

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Song Xin, Wang Jian, Zhong Zheqiang, Zhang Bin. Effects of Parameters in Smoothing of Multi-Color Spectral Dispersion on Laser-Quad Irradiation Characteristics[J]. Chinese Journal of Lasers, 2018, 45(1): 105002

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