發(fā)布時(shí)間：2018-09-14 08:53

【摘要】：射頻調(diào)制的脈沖激光是激光雷達(dá)探測領(lǐng)域內(nèi)的一項(xiàng)重要研究內(nèi)容.根據(jù)聲光斬波器的強(qiáng)度和頻率調(diào)制特性,設(shè)計(jì)了基于頻移反饋腔的全光纖射頻調(diào)制脈沖激光.理論上,建立了基于頻移反饋腔的激光外差相干理論模型,并進(jìn)行了數(shù)值仿真.根據(jù)理論模型,實(shí)驗(yàn)上嚴(yán)格控制頻移反饋腔的長度和聲光斬波器觸發(fā)信號的周期,在100 MHz的射頻信號驅(qū)動(dòng)下,產(chǎn)生了脈沖寬度110 ns、重復(fù)頻率約20 kHz的具有最高700 MHz射頻調(diào)制的脈沖激光(脈內(nèi)調(diào)制激光);同時(shí)微調(diào)斬波周期可以實(shí)現(xiàn)脈沖前沿或后沿的多樣性射頻調(diào)制.通過改變反饋腔內(nèi)光纖放大器的輸出功率實(shí)現(xiàn)了射頻調(diào)制深度的連續(xù)可調(diào),最高達(dá)到了0.67.
[Abstract]:RF modulated pulsed laser is an important research content in the field of lidar detection. According to the intensity and frequency modulation characteristics of acoustooptic chopper, an all-fiber RF modulated pulse laser based on frequency shift feedback cavity is designed. Theoretically, the theoretical model of laser heterodyne coherence based on frequency shift feedback cavity is established, and the numerical simulation is carried out. According to the theoretical model, the length of frequency shift feedback cavity and the period of acousto-optic chopper trigger signal are strictly controlled experimentally. The frequency shift feedback cavity is driven by 100 MHz RF signal. A pulse laser with a pulse width of 110 ns, and a repetition rate of about 20 kHz with a maximum RF modulation of 700 MHz (intrapulse modulated laser) is generated. The RF modulation depth is continuously adjustable by changing the output power of the fiber amplifier in the feedback cavity, and the maximum is 0.67.
【作者單位】： 北京理工大學(xué)光電學(xué)院;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:61308054)資助的課題~~
【分類號】：TN24

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