Mawu Oyamba
Kuwala kwapakati pa infrared (MIR) komwe kumakhala pakati pa 2-20 µm ndikothandiza pakuzindikiritsa mankhwala ndi chilengedwe chifukwa cha kupezeka kwa mizere yambiri ya mayamwidwe a mamolekyulu m'chigawo chowoneka bwino ichi.Gwero logwirizana, lozungulira pang'onopang'ono lomwe limaphimba nthawi imodzi yamitundu yotakata ya MIR litha kupititsa patsogolo ntchito zatsopano monga mirco-spectroscopy, femtosecond pump-probe spectroscopy, ndi miyeso yowoneka bwino kwambiri mpaka pano.
adapangidwa kuti apange ma radiation a MIR ogwirizana, monga mizere ya ma synchrotron beam, ma lasers a quantum cascade, magwero apamwamba, optical parametric oscillators (OPO) ndi optical parametric amplifiers (OPA).Mapulani onsewa ali ndi mphamvu zawo ndi zofooka zawo malinga ndi zovuta, bandwidth, mphamvu, mphamvu, ndi nthawi yothamanga.Zina mwa izo, intra-pulse difference frequency generation (IDFG) ikukopa chidwi chokulirapo chifukwa chakukula kwa ma laser amphamvu kwambiri a femtosecond 2 µm omwe amatha kupopa makristalo ang'onoang'ono opanda oxide nonlinear kuti apange kuwala kwamphamvu kwa Broadband kogwirizana kwa MIR.Poyerekeza ndi ma OPO ndi OPA omwe amagwiritsidwa ntchito nthawi zambiri, IDFG imalola kuchepetsa zovuta zamakina ndi kupititsa patsogolo kudalirika, chifukwa kufunikira kolumikiza matabwa awiri kapena mabowo molunjika kwambiri kumachotsedwa.Kupatula apo, kutulutsa kwa MIR ndikokhazikika kwa carrier-envelope-phase (CEP) kokhazikika ndi IDFG.
Chithunzi 1
Kufalikira kwa sipekitiramu ya 1-mm-chinenedwe chosatsekedwaBGS crystalzoperekedwa ndi DIEN TECH.Tsambali likuwonetsa kristalo weniweni womwe wagwiritsidwa ntchito pakuyesa uku.
Chithunzi 2
Kukonzekera koyeserera kwa m'badwo wa MIR wokhala ndi aBGS crystal.OAP, galasi la parabolic lakutali lomwe lili ndi kutalika kwa 20 mm;HWP, mbale ya theka yoweyula;TFP, polarizer yowonda-filimu;LPF, zosefera zazitali.
Mu 2010, kristalo watsopano wa biaxial chalcogenide nonlinear, BaGa4Se7 (BGSe), wapangidwa pogwiritsa ntchito njira ya Bridgman-Stockbarger.Ili ndi mawonekedwe owonekera kwambiri kuchokera ku 0.47 mpaka 18 µm (monga momwe tawonetsera mkuyu 1) ndi ma coefficients osagwirizana a d11 = 24.3 pm / V ndi d13 = 20.4 pm / V.Zenera lowonekera la BGSe ndilokulirapo kuposa ZGP ndi LGS ngakhale kuti kusagwirizana kwake kuli kotsika kuposa ZGP (75 ± 8 pm/V).Mosiyana ndi GaSe, BGSe imathanso kudulidwa pakona yofananira ndi gawo lomwe mukufuna ndipo ikhoza kukhala yotsutsana ndi kuwonetsa.
Kukonzekera koyesera kukuwonetsedwa mumkuyu 2 (a).Ma pulses oyendetsa amapangidwa kuchokera ku Kerr-lens mode-locked Cr:ZnS oscillator yokhala ndi polycrystalline Cr:ZnS crystal (5 × 2 × 9 mm3, transmission = 15% pa 1908nm) monga njira yopezera phindu. Tm-doped CHIKWANGWANI laser pa 1908nm.Kuthamanga kwa mpweya woyimirira kumapereka mphamvu za 45-fs zomwe zimagwira ntchito mobwerezabwereza 69 MHz ndi mphamvu yapakati ya 1 W pamtunda wonyamulira wa 2.4 µm.Mphamvuyi imakulitsidwa mpaka 3.3 W mu nyumba yomangidwa ndi magawo awiri a polycrystalline Cr: ZnS amplifier (5 × 2 × 6 mm3, transmission = 20% pa 1908nm ndi 5 × 2 × 9 mm3, transmission = 15% pa 1908nm), ndipo nthawi yotulutsa mphamvu imayezedwa ndi chipangizo chomangidwa kunyumba chachiwiri cha harmonic-generation frequency-resolved Optical grating (SHG-FROG).
