Umklamo wendlela ebonakalayo we-66-femtosecondi-laser ekhiyiwe ngemodi
Le laser enemodi ye-femtosecond engu-66 iyi-laser ye-fiber ye-ytterbium egcina i-all-polarization ene-shifter yesigaba esingashintshi. Ifinyelela i-147 MHz fundamental frequency mode-locking. Ngokulungisa ibanga phakathi kwama-grating, ububanzi be-spectral obungu-39.8 nm kanye nobubanzi be-pulse obungu-66 fs ngemva kokucindezelwa kwangaphandle kutholakala. Ngamandla aphezulu ephampu, i-second-order kanye ne-third-order harmonic mode-locking enemvamisa yokuphindaphinda engu-294.1 MHz kanye no-442.3 MHz iyatholakala.
Incazelo yendlela yokukhanya:
I-resonator iqukethe izingxenye ze-spatial optical ezinhlangothini zombili kanye nengxenye ye-polarization-maintaining fiber ephakathi. Ingxenye yesobunxele yesikhala ihlanganisa isibuko sokubonakalisa okuphelele (M1), ipuleti lamagagasi angu-λ/8 (EWP), kanye ne-Faraday rotator (FR). Inhlanganisela ye-EWP kanye ne-FR ingasetshenziswa njengesishintshi sesigaba esingashintshi, ihlinzeka nge-non-reciprocal phase bias, ngaleyo ndlela ithuthukise ikhono lokuziqala. Ingxenye ye-fiber iqukethe idivayisi ehlanganisiwe ye-custom wavelength division multiplexing - collimator (WDM-Collimator), i-62 cm ytterbium-doped polarization-maintaining fiber (Yb401-PM, CORACTIVE), kanye ne-optical fiber collimator (Col). I-gain fiber iphonswa yi-single-mode 976 nm laser diode (LD) enamandla amakhulu okupompa angu-1.4 W. Ingxenye yendawo efanele iqukethe ipuleti le-half-wave (HWP), i-polarization beam splitter (PBS), i-grating pair (LightSmyth T-1000-1040-3212-94), kanye nesibuko sokubonakalisa okuphelele (M2). I-transmission grating pair enobuningi bomugqa obuyimigqa/mm eyi-1000 inikeza isinxephezelo sokusabalala kwe-intra-cavity. Ibanga eliphakathi kwama-grating amabili lingalungiswa ngesigaba. Ubude besikhala samahhala kusukela ku-collimator kuya ezibukweni ezimbili zokubonakalisa ezinhlangothini zombili bungu-5.5 cm no-6.5 cm ngokulandelana.i-laserikhipha ama-pulse ngendlela eqondile evela ku-PBS.
Isimiso sokusebenza:
I-pulse yokuqala ejwayelekile edluliselwa nge-loop ye-intracavity iqala kusuka ku-PBS bese idluliselwa ku-M1. Ekuqaleni, i-HWP izohlukanisa i-pulse ibe izingxenye ezimbili ze-orthogonal, bese ingena ku-fiber optical egcina i-polarization bese isakazeka nge-axes esheshayo nehamba kancane. Isilinganiso sokuqina kwama-pulse eceleni kwama-axes amabili e-orthogonal sinqunywa yi-engeli yokujikeleza (θh) ye-HWP. Ngesikhathi sokusabalala ngaphakathi kwe-fiber optical, ngenxa yemiphumela engeyona eqondile, ukuqina okungalingani kwama-pulse ahlanganisiwe e-orthogonal kuzobangela ukushintsha kwesigaba esingeyona eqondile okuhlobene nokuqina. Isibuko sokugcina i-M1 senza ama-pulse angaphakathi adlule ku-phase shifter kabili bese ebuyela ku-fiber optical egcina i-polarization. Ama-pulse angaphakathi athola ukushintsha kwesigaba esingashintshi esingu-π/2 futhi ashintshe i-axis optical yokusabalalisa. Ukungafani kwejubane leqembu phakathi kwama-pulse ahlanganisiwe e-orthogonal kuholela ekunxephezelweni komphumela wokuphambuka. Okokugcina, i-pulse iqoqa ukushintsha kwesigaba okungeyona eqondile okuhlukile futhi ibhekana nokuphazamiseka ku-PBS. Njenge-polarizer, i-PBS ivumela ukushaya kwesimo se-polarization esifanele ukuthi kudlule, kuyilapho okunye kuboniswa ngaphandle kwe-cavity. Le nqubo idlala indima ye-absorber yokwenziwa egcwala kahle kule cavity eqondile.i-laser yokukhanya. Lapho ibanga le-grating pair lincishiswa kakhulu libe ngu-3.2 mm, unqenqema lwesobunxele lwe-spectrum luba luqine kakhulu. Ngalesi sikhathi, ukusabalala kwe-cavity net kuba kuhle, futhi kutholakala amandla aphezulu e-single-pulse angu-3.57 nJ. I-pulse self-correlation trace etholakala ngokucindezelwa kwangaphandle kwe-pulse enobubanzi be-spectral obungu-39.8 nm ifakwa umsebenzi we-Gaussian, ongu-66 fs.
Isikhathi sokuthunyelwe: Feb-25-2026