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1、第44卷第8期激光與紅外Vo1.44,No.82014年8月LASER&INFRAREDAugust,2014文章編號(hào):1001-5078(2014)08-0884-04·激光器技術(shù)·低閾值光纖激光器穩(wěn)頻特性研究張蔭民,祝連慶(北京信息科技大學(xué)光電信息與儀器北京市工程研究中心光電測(cè)試技術(shù)北京市重點(diǎn)實(shí)驗(yàn)室,北京100192)摘要:為了實(shí)現(xiàn)低閾值光纖激光器的頻率穩(wěn)定輸出,設(shè)計(jì)了環(huán)形腔光纖激光器,以光纖光柵作為波長(zhǎng)選擇元件,在未泵浦光纖飽和吸收體和其錐形化結(jié)構(gòu)的協(xié)同作用下實(shí)現(xiàn)激光縱模選擇,獲得了短光纖飽和吸收體長(zhǎng)度下的單縱模激光穩(wěn)定輸出。介紹了未泵浦光纖飽和吸收體選頻原理和錐形結(jié)構(gòu)濾波原
2、理,實(shí)驗(yàn)研究了不同光纖飽和吸收體長(zhǎng)度下激光縱模特性和波長(zhǎng)穩(wěn)定性,以及錐形化光纖飽和吸收體的激光輸出特性。實(shí)驗(yàn)表明,引入錐形化結(jié)構(gòu)的飽和吸收體后,激光器能夠穩(wěn)定輸出1545nln波長(zhǎng)的單縱模激光,并有效降低光纖激光器閾值至7.58mW,采用延遲自外差方法測(cè)得該光纖激光器的線寬小于8kHz。關(guān)鍵詞:飽和吸收體;穩(wěn)頻;錐形;拍頻;線寬中圖分類(lèi)號(hào):TN248.1文獻(xiàn)標(biāo)識(shí)碼:ADOI:10.3969/j.issn.1001-5078.2014.08.011StudyonFrequencystabilizationoflowthresholdfiberlaserZHANGYin-rain,ZH
3、ULian—qing(BeijingEngineeringResearchCenterofOptoelectronicInformationandInstrument,BeijingKeyLaboratoryofOptoelectronicMeasurementTechnology,BeijingInformationScience&TechnologyUniversity,Beijing100192,China)Abstract:Inordertorealizethestableoutputofa1ow—thresholdfiberlaser,afiberringlaserisd
4、esigned,whichem—ploysafiberBragggratingasthewavelengthselector,andthelaserlongitudinalmodechoiceisrealizedunderun·pumpederbium—dopedfibersaturableabsorberanditstaperedstructure.,rhestablesingle—longituinal—modelaserout—putcanbeobtainedundershoafibersaturableabsorber.Theprinciplesoffibersaturab
5、leabsorberonfrequencyse.1ectionandtaperedstructurefilteringareintroduced.Thecharacteristicsoflaserlongitudinalmodesandwavelengthstabilityarestudiedunderfibersaturableabsorbersofdifferentlength.a(chǎn)ndthelaseroutputcharacteristicsoftaperedfibersaturableabsorberareinvestigatedexperimentally.Theexper
6、imentalresultsshowthat.a(chǎn)fterintroducingtheta—peredfibersaturableabsorber,thesingle—longitudinal—modelaseroutputcansteadilybeobtainedat1545nm,andthethresholdofthefiberlasercanbeefectivelyreduceddownto7.58mW.nlelaserlinewidththatismeasuredbythedelayedself-hetemdynemethodislessthan8kHz.Keywords:s
7、aturableabsorber;frequencystabilization;taper;beatfrequency;linewidth1引言腔而言,想要獲取穩(wěn)定的激光輸出一般采用縮短腔頻率穩(wěn)定的光纖激光器在高精度光譜、光學(xué)測(cè)長(zhǎng)增加腔內(nèi)相鄰縱模間隔來(lái)實(shí)現(xiàn),如超短腔分布式量和光纖傳感方面具有廣泛的應(yīng)用¨I2]。由于光纖布拉格反射(DBR)光纖激光器和分布式反饋具有體積小、耐腐蝕、抗電磁干擾、可多路復(fù)用等多(DFB)光纖激光器L6J,但這需要極高濃度的摻雜光項(xiàng)突出優(yōu)點(diǎn),