Igishushanyo mbonera cy'inzira y'amajwi ya 66-femtosecondlaser ifunze mu buryo
Iyi laser ifite uburyo bwa 66-femtosecond mode-locked ni laser ifite uburyo bwa linear cavity bukomeza polarisation yose hamwe na non-reciprocal phase shifter. Igera kuri 147 MHz fundamental frequency mode-locking. Mu guhindura intera iri hagati y'imirongo, ubugari bwa spectral bwa 39.8 nm n'ubugari bwa pulse bwa 66 fs nyuma yo gukanda hanze. Iyo ikoresheje pompe nyinshi, uburyo bwa second-order na third-order harmonic-locking hamwe na repetition frequencing ya 294.1 MHz na 442.3 MHz biragerwaho.
Ibisobanuro by'inzira y'urumuri:
Resonator igizwe n'ibice by'urumuri ku mpande zombi hamwe n'igice cy'urumuri gikomeza polarisation hagati. Igice cy'ibumoso kirimo indorerwamo igaragara neza (M1), plaque ya λ/8 wave (EWP), na Faraday rotator (FR). Uruvange rwa EWP na FR rushobora gukoreshwa nk'impinduka mu buryo butari bwo, bigatanga imiterere idahinduka, bityo bikongera ubushobozi bwo gutangira. Igice cy'urumuri kigizwe n'igikoresho cyakozwe mu buryo bwihariye cyo gutandukanya uburebure bw'umuraba - collimator (WDM-Collimator), fibre ikomeza polarisation ya cm 62 ytterbium (Yb401-PM, CORACTIVE), na collimator ya fiber optique (Col). Fibre yo gukuraho ikoreshwa na diode ya laser ya 976 nm (LD) ifite ubushobozi ntarengwa bwo gupima 1.4 W. Igice cy'iburyo kigizwe na plate ifite igice cy'umuraba (HWP), polarisation beam splitter (PBS), grating pair (LightSmyth T-1000-1040-3212-94), n'indorerwamo y'inyuma (M2). Indorerwamo y'inyuma ifite ubucucike bw'umurongo wa lines 1000 / mm itanga indishyi yo gutatanya hagati y'ubuso. Intera iri hagati y'indorerwamo ebyiri ishobora guhindurwa hakoreshejwe icyiciro. Uburebure bw'umwanya uva kuri collimator kugeza ku ndorerwamo ebyiri z'inyuma ku mpande zombi ni cm 5.5 na cm 6.5.laserisohora imivuduko mu buryo bugororotse buva kuri PBS.
Ihame ry'imikorere:
Umuvuduko wa mbere usanzwe woherezwa binyuze mu ruziga rw'imbere mu kanwa utangirira kuri PBS woherezwa kuri M1. Mu ntangiriro, HWP izahindura umuvuduko mo ibice bibiri bya orthogonal, hanyuma yinjire muri fiber optique ikomeza polarisation hanyuma ikwirakwira ku migozi yihuta kandi yihuta. Igipimo cy'ubukana bw'imivuduko ku migozi ibiri ya orthogonal kigenwa n'inguni yo kuzenguruka (θh) ya HWP. Mu gihe cyo gukwirakwira muri fiber optique, bitewe n'ingaruka zitari umurongo, ubukana butangana bw'imivuduko ya orthogonal polarized pulses buzatuma habaho impinduka zijyanye n'ubukana bw'imivuduko idahuje umurongo. Indorerwamo ya nyuma M1 ituma imivuduko ya orthogonal inyura muri phase shifter kabiri igasubira kuri fiber optique ikomeza polarisation. Imivuduko ya orthogonal ibona impinduka ya π/2 idahuza kandi igahinduranya umurongo wa optique. Kudahuza kw'umuvuduko w'itsinda hagati y'imivuduko ya orthogonal polarized pulses bitanga ingurane y'ingaruka zo kunyura. Amaherezo, umuvuduko uteranya impinduka zitandukanye za nonlinear phase kandi ukanyura muri PBS. Nk'igikoresho gitera ubwiza, PBS yemerera ubwiza bw'imiterere y'ubwiza bw'umwuka (polarization state) kunyuramo, mu gihe ibindi byose bigaragarira hanze y'ubwobo. Ubu buryo bugira uruhare rw'icyuma gitera ubwiza bw'ubukorano muri ubwo bwobo bugororotse.laser y'amasoIyo intera ya grating pair igabanutse cyane ikagera kuri mm 3.2, impande y'ibumoso ya spectrum iba irambuye cyane. Muri iki gihe, gutatana kwa cavity net kuba ari positive, kandi ingufu ntarengwa za 3.57 nJ ziraboneka. Ishusho y'imivuduko yihuza n'imivuduko iboneka binyuze mu gukanda kw'inyuma kw'imivuduko ifite ubugari bwa spectral bwa 39.8 nm yagutse cyane ishyirwaho na function ya Gaussian, ari yo fs 66.
Igihe cyo kohereza: 25 Gashyantare 2026