Mid-infrared laser tuaj yeem siv rau kev tshawb nrhiav roj av, kev ntsuas photoacoustic spectroscopic, isotope precision tsom, thiab hauv kev ntsuas optoelectronic, nws kuj yog ib qho cuab yeej muaj zog los xyuas thiab sib npaug ntawm infrared kev taw qhia ntawm unmanned aircraft, qhov chaw raws thiab huab cua. -based missile tiv thaiv systems. Qhov nyuaj ntawm kev tau txais mid-infrared laser yog thawj zaug vim qhov bandgap ntawm nruab nrab-infrared laser crystals feem ntau loj, thiab emission nyob rau hauv nruab nrab-infrared band (3 μm ~ 5 μm) yog qhov nyuaj; semiconductor quantum cascade lasers (QCLs) siv lub zog theem tsim qauv los ua kom lub semiconductor muaj ntau qhov nqaim cascade bandgaps, thiab emit ntev wavelengths, thiab lub wavelengths feem ntau nyob rau hauv nruab nrab-infrared band ntawm 4 μm ~ 12 μm, tab sis vim yog divergence ntawm QCLs Txawm li cas los xij, vim yog lub kaum sab xis loj ntawm QCL, lub wavelength linewidth yog dav heev, lub ncov lub zog qis, daim ntawv thov teb tau txwv zoo heev, thiab QCL nrog lub zog siab dua yog embargoed los ntawm txawv teb chaws, uas nyuaj rau tau txais domestically. Lwm qhov laj thawj yog qhov tsis zoo thiab tus nqi siab ntawm cov khoom siv kho qhov muag hauv nruab nrab-infrared wavelength band, tshwj xeeb tshaj yog cov khoom siv kho qhov muag tsis zoo, xws li lithium niobate crystals nrog lub sijhawm polarization, thiab ntau lub substrates thiab cov txheej txheem yuav tsum tau imported equipments, uas txwv txoj kev. ntawm generating mid-infrared lasers los ntawm nonlinear txoj kev.
Txhawm rau daws qhov teeb meem no, Nanjing University Zhu Shining pab pawg, siv cov cuab yeej parametric cascade los kov yeej lithium niobate absorption poob hauv 5μm band, los daws qhov teeb meem ntawm kev nruam nthwv dej nruab nrab-infrared laser tiam deb li 5.19μm, thiab lub wavelength. tuaj yeem hloov kho los ntawm qhov ze infrared mus rau nruab nrab-infrared wavelength band txuas ntxiv mus, nrog cov qauv yooj yim, qhov dav ntawm wavelength tuning, nqaim linewidth, qhov zoo ntawm cov nqaj zoo, thiab yuav tsum tau siv rau kev tshawb nrhiav roj, nws xav tau. siv rau hauv kev tshawb nrhiav roj, photoelectricity countermeasures thiab lwm yam teb. Lub tshuab yog tsim los ntawm magnesium-doped ib ntus polarized lithium niobate (MgO: PPLN), thiab cov txheej txheem cascading optical parametric oscillation (TOPO) tau paub los ntawm kev siv ib lub voj voog. Cov txheej txheem cascade muaj optical parametric oscillation (OPO) teeb liab lub teeb cascade siv lub teeb, thiab ib txhij outputs peb mid-infrared wavelengths uas yuav ua tau wavelength-tuned, thiab los ntawm qhov txo ntawm intracavity poob, lub nruam-yoj resonance tso zis yog pom tau hais tias, thiab Lub zog tso zis ntau tshaj yog ntau tshaj 2.6 W ntawm 3896 nm. Kev tsim kho tshiab ntawm cov thev naus laus zis no nyob hauv qhov cascade ntawm optical parametric oscillations los ntawm ib lub voj voog ib zaug, thiab txo qis ntawm qhov tsis txaus ntseeg los ntawm kev ua haujlwm kho qhov muag, kom cov nthwv dej nthwv dej resonance OPO tuaj yeem siv los ua cov nthwv dej txuas ntxiv. Lub nruam-yoj resonant OPO muaj peev xwm ua tau ntev-yoj cascade txheej txheem.
Wavelength tuning ntawm OPO thiab TOPO
Raws li lub xyoo ntawm tsub zuj zuj nyob rau hauv lub teb ntawm lithium niobate superlattice cov ntaub ntawv thiab laser tshuab, lub tunable OPO tsim los ntawm cov pab pawg neeg tau ntse hloov mus rau hauv ntau hom mid-infrared lasers npog nruam yoj, nanosecond mem tes, picosecond ultra-ceev, thiab lwm yam. , uas tau txais kev qhuas zoo los ntawm cov neeg siv los ntawm ntau lub tsev kawm ntawv qib siab, cov koom haum tshawb fawb thiab cov tub rog. Tam sim no, qhov ntev tshaj plaws tso zis wavelength ntawm tunable laser khoom muaj peev xwm ncav cuag 4.65μm, thiab lub siab tshaj plaws tso zis hwj chim yog ntau tshaj 10W.
