Tsarin hanyar gani na 66-femtosecondlaser mai kullewa
Wannan laser mai kullewa na tsawon lokaci na femtosecond 66 wani laser ne mai layi wanda ke kula da dukkan ramukan ytterbium tare da canjin lokaci mara daidaituwa. Yana cimma 147 MHz na yanayin mita na asali. Ta hanyar daidaita nisan da ke tsakanin gratings, an sami faɗin spectral na 39.8 nm da faɗin bugun jini na 66 fs bayan matsewa ta waje. A babban ƙarfin famfo, an cimma kulle yanayin harmonic na tsari na biyu da na uku tare da maimaita mita na 294.1 MHz da 442.3 MHz.
Bayanin hanyar gani:
Resonator ɗin ya ƙunshi sassan gani na sarari a ɓangarorin biyu da kuma ɓangaren zare mai kula da polarization a tsakiya. Sashen sararin samaniya na hagu ya haɗa da madubin tunani gaba ɗaya (M1), farantin raƙuman ruwa na λ/8 (EWP), da kuma mai juyawa na Faraday (FR). Haɗin EWP da FR za a iya amfani da shi azaman mai sauya yanayin lokaci mara juyawa, yana ba da son zuciya na lokaci mara juyawa, ta haka yana haɓaka ikon farawa kai tsaye. Sashen zare ya ƙunshi na'urar haɗakarwa ta musamman ta rarraba raƙuman ruwa - collimator (WDM-Collimator), zaren da ke kula da polarization mai tsawon cm 62 (Yb401-PM, CORACTIVE), da kuma mai haɗa fiber optical collimator (Col). Ana amfani da na'urar laser diode mai tsawon mita 976 (LD) mai ƙarfin famfo mai matsakaicin ƙarfin famfo na 1.4 W. Sashen sarari mai kyau ya ƙunshi faranti rabin-wave (HWP), mai raba hasken polarization (PBS), mai raba haske (LightSmyth T-1000-1040-3212-94), da kuma madubin haske gaba ɗaya (M2). Na'urar rarraba haske mai tsawon layuka 1000/mm tana ba da diyya ga watsawar rami a cikin rami. Ana iya daidaita nisan da ke tsakanin na'urorin biyu ta hanyar mataki. Tsawon sarari mai 'yanci daga mai haɗa haske zuwa madubin haske guda biyu a ɓangarorin biyu shine 5.5 cm da 6.5 cm bi da bi.laseryana fitar da bugun jini ta hanyar layi mai layi daga PBS.
Ka'idar aiki:
Bugawar farko da aka daidaita ta hanyar madauki a cikin ramin yana farawa daga PBS kuma ana watsa ta zuwa M1. Da farko, HWP zai wargaza bugun zuwa sassa biyu na orthogonal, sannan ya shiga zaren gani mai kiyaye polarization kuma ya yaɗu tare da gatari mai sauri da jinkirin. Rabon ƙarfin bugun da ke kan gatari biyu na orthogonal ana ƙaddara shi ta hanyar kusurwar juyawa (θh) na HWP. A lokacin yaduwa a cikin zaren gani, saboda tasirin da ba na layi ba, ƙarfin rashin daidaituwa na bugun polarized na orthogonal zai haifar da canjin yanayin da ba na layi ba da ke da alaƙa da ƙarfi. Madubin ƙarshe M1 yana ba wa bugun orthogonal damar wucewa ta hanyar canjin yanayin sau biyu kuma su koma zuwa zaren gani mai kiyaye polarization. Bugawar orthogonal suna samun canjin yanayin π/2 wanda ba na juna ba kuma suna musayar canjin yanayin gani. Rashin daidaiton saurin rukuni tsakanin bugun polarized na orthogonal yana haifar da diyya ga tasirin karkacewa. A ƙarshe, bugun yana tara canje-canjen yanayin da ba na layi ba daban-daban kuma yana fuskantar tsangwama a PBS. A matsayinsa na polarizer, PBS yana ba da damar bugun yanayin polarization da ya dace ya ratsa, yayin da sauran kuma ana nuna shi daga cikin ramin. Wannan tsari yana taka rawar mai shaye-shaye na wucin gadi a cikin wannan ramin layi.Laser na ganiIdan aka ƙara rage nisan da ke tsakanin grating biyu zuwa 3.2 mm, gefen hagu na bakan ya zama mai tsayi sosai. A wannan lokacin, watsawar ramin ramin yana da kyau, kuma ana samun matsakaicin kuzarin bugun jini ɗaya na 3.57 nJ. An sanya alamar haɗin kai ta bugun jini da aka samu ta hanyar matse bugun jini na waje tare da faɗin spectral na 39.8 nm ta hanyar aikin Gaussian, wanda shine 66 fs.
Lokacin Saƙo: Fabrairu-25-2026