本文選題：光纖激光 + 相干合成　； 參考：《中國(guó)科學(xué)院研究生院（光電技術(shù)研究所）》2015年碩士論文

【摘要】：基于隨機(jī)并行梯度下降算法(SPGD算法)的光纖激光相干合成方案是獲得高亮度、高質(zhì)量的相干合成光束的有效途徑。實(shí)現(xiàn)光纖激光相干合成的關(guān)鍵是校正各組束間的相位誤差。相位控制精度和控制帶寬是評(píng)價(jià)系統(tǒng)校正能力的兩個(gè)主要指標(biāo),它依賴(lài)于算法特性、算法實(shí)現(xiàn)平臺(tái)和相位控制器件特性。本文主要研究基于SPGD算法的光纖激光相干合成系統(tǒng)的性能優(yōu)化問(wèn)題,主要包括基于現(xiàn)場(chǎng)可編程邏輯門(mén)陣列(FPGA)的硬件控制平臺(tái)實(shí)現(xiàn)和自適應(yīng)光纖準(zhǔn)直器(AFOC)的諧振性能優(yōu)化兩個(gè)方面。首先,基于實(shí)際應(yīng)用的光纖激光相干合成系統(tǒng),開(kāi)發(fā)了一個(gè)基于FPGA的硬件控制平臺(tái),該平臺(tái)最多可以完成21單元光束的相干合成控制。然后結(jié)合平臺(tái)的硬件特性,從相位控制精度和系統(tǒng)控制帶寬兩個(gè)評(píng)價(jià)指標(biāo)的角度分析了硬件控制平臺(tái)的性能。理論分析得知,該平臺(tái)的鎖相和傾斜控制的理論帶寬分別為1.37 k Hz和9 Hz。然后,首次將雙二階數(shù)字濾波器用于優(yōu)化AFOC的諧振特性,完成了該濾波器相關(guān)的理論推導(dǎo)和仿真分析。結(jié)果表明,該方法可以有效地抑制AFOC的諧振峰,提高AFOC的有效控制帶寬。另外基于現(xiàn)有AFOC器件的諧振特性,結(jié)合階梯減振結(jié)構(gòu)和雙二階數(shù)字濾波器兩種方法設(shè)計(jì)了一套減振方案,將AFOC的有效帶寬從1k Hz提高到2.5k Hz。再者,結(jié)合自主開(kāi)發(fā)的硬件平臺(tái)和雙二階數(shù)字濾波器技術(shù),基于實(shí)際應(yīng)用的相干合成系統(tǒng)完成了各控制模塊的分析、設(shè)計(jì)、編程和調(diào)試�？刂颇K主要包括數(shù)據(jù)采集、偽隨機(jī)數(shù)生成、SPGD控制迭代、電壓同步輸出、雙二階數(shù)字濾波器、參數(shù)配置、信息顯示和數(shù)據(jù)交換,通過(guò)各模塊的組合可以實(shí)現(xiàn)該平臺(tái)的鎖相控制和傾斜控制功能。最后,搭建了一個(gè)基于硬件控制平臺(tái)的七路光纖激光相干合成系統(tǒng),在室內(nèi)弱湍流情況下,分別完成了基于硬件控制平臺(tái)的鎖相和傾斜控制實(shí)驗(yàn),并從桶中功率(PIB)、相位控制精度和系統(tǒng)控制帶寬三個(gè)方面分析了系統(tǒng)性能。鎖相實(shí)驗(yàn)結(jié)果表明,PIB值從鎖相前的0.32提高到鎖相后的1.20,系統(tǒng)實(shí)際相位控制精度為1/19?,鎖相控制帶寬約為1k Hz;傾斜控制實(shí)驗(yàn)結(jié)果表明,PIB值從開(kāi)環(huán)時(shí)的0.45提高到閉環(huán)后的0.68,傾斜控制帶寬約為6Hz。全文為后續(xù)基于SPGD算法的光纖激光相干合成系統(tǒng)的實(shí)際應(yīng)用和性能提高提供了有效的硬件支撐和技術(shù)基礎(chǔ)。
[Abstract]:The optical fiber laser coherent combination scheme based on the stochastic parallel gradient descent algorithm (SPGD) is an effective way to obtain high brightness and high quality coherent composite beams. The key to realize coherent combination of optical fiber laser is to correct the phase error between each group of beams. Phase control precision and control bandwidth are two main indexes to evaluate the system correction capability. They depend on the algorithm characteristics, the algorithm implementation platform and the phase controller characteristics. In this paper, the performance optimization of optical fiber laser coherent combination system based on SPGD algorithm is studied. The hardware control platform based on FPGA (Field Programmable Logic Gate Array) and the resonant performance optimization of adaptive optical fiber collimator (AFOC) are discussed in this paper. Firstly, a hardware control platform based on FPGA is developed based on the practical application of optical fiber laser coherent synthesis system. The platform can control the coherent combination of 21 units of beams at most. Then the performance of the hardware control platform is analyzed from the angle of the phase control precision and the system control bandwidth combined with the hardware characteristics of the platform. Theoretical analysis shows that the theoretical bandwidth of phase-locked and tilt control is 1.37 kHz and 9 Hz respectively. Then, the bisecond-order digital filter is used to optimize the resonant characteristics of AFOC for the first time, and the theoretical derivation and simulation analysis of the filter are completed. The results show that this method can effectively suppress the resonance peak of AFOC and increase the effective control bandwidth of AFOC. In addition, based on the resonance characteristics of the existing AFOC devices, a damping scheme is designed by combining the step damping structure and the two-order digital filter. The effective bandwidth of the AFOC is increased from 1kHz to 2.5kHz. Furthermore, based on the self-developed hardware platform and double-second-order digital filter technology, the coherent synthesis system based on practical application has completed the analysis, design, programming and debugging of each control module. The control module mainly includes data acquisition, pseudo random number generation SPGD control iteration, voltage synchronous output, double second order digital filter, parameter configuration, information display and data exchange. The phase lock control and tilt control function of the platform can be realized by the combination of each module. Finally, a seven-channel optical fiber laser coherent combination system based on hardware control platform is built, and the phase locking and tilt control experiments based on hardware control platform are completed in the case of weak turbulence in the room. The performance of the system is analyzed from three aspects: the power in the bucket, the precision of phase control and the control bandwidth of the system. The results of phase-locked experiment show that the PIB value increases from 0.32 before phase-locking to 1.20 after phase-locked. The actual phase control precision of the system is 1 / 19, and the control bandwidth of phase-locked is about 1kHz. The results of tilt control experiment show that the PIB value increases from 0.45 in open loop to 0.45 in closed loop. The tilt control bandwidth is about 6 Hz. This paper provides an effective hardware support and technical foundation for the practical application and performance improvement of the optical fiber laser coherent combination system based on SPGD algorithm.
【學(xué)位授予單位】：中國(guó)科學(xué)院研究生院（光電技術(shù)研究所）
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN24;TN253

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