Laser ya buluu yamphamvu kwambiri ya 457nm yokhala ndi ma frequency amodzi

457nm yamphamvu kwambiri yozungulira kamodzilaser yabuluu
Kapangidwe ka njira yowunikira ya laser ya buluu yamphamvu kwambiri ya 457nm yokhala ndi ma frequency amodzi
Gwero la pampu lomwe limagwiritsidwa ntchito ndi gulu la 30 W fiber-coupled laser diode. Kachiwiri, ring resonator imasankhidwa kuti isankhidwe mode. Mbali yomaliza imapopedwa ndi kristalo ya Nd3+-doped yttrium vanadate (Nd:YVO4) yautali wa 5 mm yokhala ndi kuchuluka kwa 0.1%. Kenako, kudzera mu cavity ya kristalo ya I-type phase-matched lithium triborate (LBO), harmonic yachiwiri imapangidwa kuti ikwaniritse 457nm high-power single-frequency.laserkutulutsa. Mphamvu ya pampu ikakhala 30 W, mphamvu yotulutsa ya laser ya 457nm single-frequency ndi 5.43 W, kutalika kwa mafunde apakati ndi 457.06 nm, mphamvu yosinthira kuwala kukhala kuwala ndi 18.1%, ndipo kukhazikika kwa mphamvu mkati mwa ola limodzi ndi 0.464%. Laser ya 457nm imagwira ntchito mu fundamental mode mkati mwa resonator. Zinthu zamtundu wa beam motsatira malangizo a x ndi y ndi 1.04 ndi 1.07 motsatana, ndipo ellipticity ya malo owala ndi 97%.

Kufotokozera njira yowunikira ya kuwala kwa buluu wamphamvu kwambirilaser ya ma frequency amodzi
Gwero la pampu limagwiritsa ntchito ulusi wowala wolumikizidwadiode ya laser ya semiconductorgulu lokhala ndi kutalika kwa mafunde apakati pa 808 nm, mphamvu yotulutsa yopitilira ya 30 W, ndi m'mimba mwake wa ulusi wa 400 μm, ndi malo otseguka a manambala a 0.22.
Kuwala kwa pampu kumawongoleredwa ndi kuyang'aniridwa ndi magalasi awiri ozungulira a plano okhala ndi kutalika kwa 20 mm kenako amagwera pagalasi la laser. Khiristo ya laser ndi kristo ya 3 mm × 3 mm × 5 mm Nd:YVO4 yokhala ndi kuchuluka kwa doping kwa 0.1%, ndi mafilimu oletsa kuwunikira a 808 nm ndi 914 nm omwe amaikidwa mbali zonse ziwiri, ndipo kristoyo imakulungidwa ndi indium foil ndikuyikidwa mu chogwirira cha mkuwa. Chogwirira cha mkuwa chimayendetsedwa bwino ndi kutentha ndi choziziritsira cha semiconductor ndikuyikidwa pa 15℃.
Resonator ndi mphete yokhala ndi magalasi anayi yokhala ndi M1, M2, M3, ndi M4.
M1 ndi galasi lozungulira lomwe lili ndi mafilimu oletsa kuwunikira a 808 nm, 1064 nm, ndi 1342 nm (R<0.05%), ndi filimu yowonetsera yonse ya 914 nm (R>99.8%); M4 ndi galasi lotulutsa mpweya lomwe lili ndi mafilimu oletsa kuwunikira a 914 nm (R>99.8%), 457 nm ndi 1064 nm, 1342 nm (R<0.02%); M2 ndi M3 zonse ndi magalasi okhala ndi plano-concave okhala ndi radius yozungulira ya r = 100 mm, okhala ndi mafilimu oletsa kuwunikira a 1064 nm ndi 1342 nm (R<0.05%) pa ndege ndi mafilimu owonetsera onse a 914 nm ndi 457 nm (R>99.8%) pamwamba pa concave.
Mbale ya theka la mafunde ndi kristalo ya TGG yomwe ili mu mphamvu ya maginito zonse zili ndi mafilimu oletsa kuwunikira a 914 nm (R<0.02%). Mwa kuyambitsa chipangizo chowongolera chopangidwa ndi TGG ndi mbale ya theka la mafunde, laser imakakamizidwa kuyenda molunjika mu resonator ya mphete, motero kuonetsetsa kuti laser ikugwira ntchito mokhazikika mu mkhalidwe wa ma frequency amodzi. FP ndi chidutswa chokhazikika chokhala ndi makulidwe a 2 mm, chokhala ndi reflectivity yophimbidwa mbali ziwiri ya 50%, ndipo chimachepetsa ntchito ya ma frequency amodzi a laser m'chimbudzi. Kristalo ya LBO imasankhidwa ngati kristalo yobwerezabwereza kawiri, yokhala ndi kukula kwa 3 mm × 3 mm × 15 mm, ndipo imakutidwa ndi mafilimu oletsa kuwunikira a 914 nm ndi 457 nm (R<0.02%), yokhala ndi I-type phase matching, cutting angle θ = 90°, φ = 21.9°.