【摘要】：近年來,合成孔徑激光雷達(dá)憑借其能夠打破衍射極限對于入瞳孔徑的制約、改善傳統(tǒng)激光雷達(dá)空間分辨能力的優(yōu)勢,在相干激光雷達(dá)探測體系中的地位愈發(fā)重要,其關(guān)鍵技術(shù)之一即為雷達(dá)探測光源寬帶線性調(diào)頻激光的獲取。由于跳模現(xiàn)象在激光器頻率調(diào)制過程中難以避免,因此,針對于線性調(diào)頻激光器的跳模抑制研究工作就有著十分重要的意義。在理論部分,本文主要介紹了激光的模式理論和單縱模選取方法,對比各種選模方法的優(yōu)缺點(diǎn),最終確定本實(shí)驗(yàn)的單縱模選取方案為F-P標(biāo)準(zhǔn)具法,并對不同參數(shù)標(biāo)準(zhǔn)具的選模性能進(jìn)行理論分析。本文針對于影響輸出激光穩(wěn)定性的各種因素及相應(yīng)穩(wěn)頻手段也進(jìn)行了簡要闡述。分析了各種激光頻率調(diào)制方法,選取直接腔長調(diào)制法作為實(shí)驗(yàn)方案。之后從增益損耗角度出發(fā),介紹了導(dǎo)致均勻加寬激光器中跳�，F(xiàn)象出現(xiàn)的本質(zhì)原因?yàn)槟Ｊ礁偁幮?yīng),確定了改變標(biāo)準(zhǔn)具角度位置和諧振腔腔長來實(shí)現(xiàn)跳模抑制的實(shí)驗(yàn)方案。在實(shí)驗(yàn)部分,我們完成了所設(shè)計的跳模抑制系統(tǒng)的搭建,實(shí)現(xiàn)了基于Lab VIEW的跳模抑制系統(tǒng)控制程序開發(fā),并從輸出激光調(diào)頻范圍角度對于LD泵浦Nd:YVO4激光器進(jìn)行相關(guān)的實(shí)驗(yàn)分析。從只改變標(biāo)準(zhǔn)具角度位置、只改變諧振腔腔長以及二者協(xié)調(diào)變化這三個方面進(jìn)行實(shí)驗(yàn)研究。實(shí)驗(yàn)結(jié)果表明,標(biāo)準(zhǔn)具角度位置的改變主要影響其自由光譜區(qū)的移動,諧振腔腔長的改變主要影響腔內(nèi)激光模式的移動,只有在二者協(xié)調(diào)變化時才能實(shí)現(xiàn)對于跳模的抑制。最終得到輸出激光調(diào)頻范圍為4.40GHz,約為激光器諧振腔相鄰縱模間隔長度的二倍,說明實(shí)驗(yàn)系統(tǒng)能有效地抑制跳模。
[Abstract]:In recent years, with its ability to break the restriction of diffraction limit on pupil diameter and improve the spatial resolution of traditional lidar, synthetic aperture lidar (SAR) plays an increasingly important role in coherent lidar detection system. One of its key technologies is the acquisition of broadband linear frequency modulation (LFM) laser of radar detection light source. Because the mode hopping phenomenon is difficult to avoid in the frequency modulation process of the laser, it is of great significance to study the mode hopping suppression of the LFM laser. In the theoretical part, this paper mainly introduces the laser mode theory and the single longitudinal mode selection method, compares the advantages and disadvantages of various modes selection methods, and finally determines that the single longitudinal mode selection scheme of this experiment is F-P standard method. The model selection performance of different parameter standard tools is analyzed theoretically. In this paper, the factors affecting the stability of the output laser and the corresponding frequency stabilization methods are also briefly described. Various laser frequency modulation methods are analyzed, and the direct cavity long modulation method is selected as the experimental scheme. Then from the angle of gain loss, the essential reason of mode hopping phenomenon in uniform broadening laser is the mode competition effect, and the experimental scheme of mode hopping suppression is determined by changing the standard angle position and cavity length. In the experiment part, we completed the design of the mode-hopping suppression system, and realized the control program development of the mode-hopping suppression system based on Lab VIEW. The experimental analysis of LD pumped Nd:YVO4 laser is carried out from the angle of the frequency modulation range of the output laser. The experimental study is carried out from only changing the angular position of the standard resonator, changing the cavity length and the coordination between the two. The experimental results show that the change of the standard angular position mainly affects the movement of the free spectral region, and the change of the cavity length mainly affects the laser mode movement in the cavity. Only when the two changes harmoniously can the mode hopping be suppressed. Finally, the frequency modulation range of the output laser is 4.40 GHz, which is about twice the length of the adjacent longitudinal mode interval in the laser resonator, which shows that the experimental system can effectively suppress the mode hopping.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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