Koj Puas Paub Txog Mid-infrared Solid-state Lasers?(Part 2)

Mid-infrared solid-state lasernrog lub wavelength ntawm 3 ~ 5μm muaj qhov zoo ntawm kev ua haujlwm siab, me me, thiab lub teeb yuag, thiab muaj cov txiaj ntsig tseem ceeb hauv kev lag luam, kev kho mob, kev ua tub rog, thiab lwm yam. siv lead ua thiab infrared siab-lub zog laser twj tso kua mis qhov chaw nrog ntev tso zis wavelengths tau dhau los ua ib qho ntawm cov kev txhim kho yav tom ntej ntawm mid-infrared solid-state laser.

Peb mam li tham txog tiam technology ntawm mid-infrared solid-state laser.

(2) Holmium doped khoom laser

Lub 2μm band coherent lub teeb ci muaj qhov sib kis tau zoo nyob rau hauv huab cua thiab yog qhov zoo tshaj plaws lub teeb rau kev ntsuas cua ceev, coherent Lidar, chaw taws teeb sensing, thiab lwm yam kev siv.

Qhov nce nruab nrab doped nrog holmium ion tuaj yeem tsim lub laser ncaj qha txog 2.1 µm. Holmium ions muaj qhov nqus qhov siab ze-pom pom thiab 1.9µm. Yav dhau los holmium lasers tau siv los ntawm lub teeb nyem, thiab cov co-doped ions xws li Tm3 ntxiv tau ntxiv rau qhov nce nruab nrab raws li cov sensitizers, uas tsis yog qhov tsim nyog kom tau txais kev hloov pauv siab ntawm chav tsev kub.

Tam sim no, txoj hauv kev zoo tshaj plaws yog siv 1.9µm laser tsim los ntawm thulium-doped laser ncaj qha twj holmium siv lead ua, lossis siv lub laser semiconductor li ntawm 1908 nm ua qhov chaw siv, uas tuaj yeem ua tiav qhov ruaj khov thiab muaj txiaj ntsig holmium laser tso tawm ntawm chav kub.

(3) Erbium-doped solid-state laser

4I 11/2 → 4I 13/2 kev hloov pauv ntawm Er3 ntxiv tuaj yeem tsim cov laser hauv band ntawm 2.7 ~ 3 μm hauv cov substrates sib txawv, uas tuaj yeem ncaj qha tau los ntawm xenon teeb thiab LD twj tso kua mis siab doping concentration ntawm Erbium khoom. Cov ntaub ntawv paub tab tau kawm suav nrog Er: YAG, Er: YLF, Er: YSGG, Er: GSGG, Er: BYF, thiab lwm yam. Nyob rau xyoo tas los no, kuj tau muaj kev tshawb fawb txog oxide laser ceramics ua cov ntaub ntawv matrix, xws li Er: LuO3. ,e:y2o3, lwm.

GSGG siv lead ua thermal conductivity yog tsawg, muaj ib tug loj thermal lens nyhuv, thiab nws yog ib qho nyuaj rau ua kom tiav repetition zaus, siab zog, thiab siab beam zoo ntawm mid-infrared laser tso zis; YSGG matrix cov ntaub ntawv tuaj yeem siv rau qhov tsawg dua qhov nruab nrab thiab lub zog me me zog-xeev laser, thiab lub zog phonon yog tsawg, thiab kev cuam tshuam ntawm ntau lub phonon tsis-radiative hloov pauv me me.

YAG siv lead ua matrix kev loj hlob thev naus laus zis yog qhov paub tab, yooj yim rau dope, muaj cov thermal conductivity siab, siab laser kev puas tsuaj, thiab zoo heev lub cev thiab tshuaj. Piv nrog rau YAG siv lead ua, YLF siv lead ua qauv kev ntxhov siab, thiab kev ntxhov siab thermal yog qhov loj dua, muaj qee yam thermal lens nyhuv, thiab cov txheej txheem kev loj hlob siv lead ua nyuaj. Lub tshuab nqus dej ntawm Er: YAG laser feem ntau muab faib ua xenon teeb siv, LD sab siv, thiab LD kawg siv, uas tuaj yeem tso tawm 2940 nm laser nrog lub zog siab thiab lub zog loj.

(4) Hloov pauv hlau chromium hlau doped khoom laser

Hloov cov hlau ions Cr2 ntxiv, Ni2 ntxiv, Co2 ntxiv, thiab Fe2 ntxiv nthuav tawm zoo dua nruab nrab-infrared laser zog nyob rau hauv pab pawg Ⅱ-Ⅵ semiconductor cov ntaub ntawv, tshwj xeeb tshaj yog cov semiconductor crystals doped nrog Cr2 ntxiv ions, xws li Cr2 ntxiv: ZnSe, Cr2 ntxiv : ZnS, muaj cov khoom fluorescence zoo nyob rau hauv chav tsev kub, dav tuning ntau, thiab siab quantum efficiency. Cr2 ntxiv: ZnSe muaj qhov sib txawv ntawm qhov ntev ntawm 2200-2700 nm, thiab Cr2 ntxiv: ZnS muaju muaj qhov tso zis ntau ntawm 2100-2700 nm.

(5) Mid-infrared laser raws li nonlinear tshuab

① Qhov sib txawv-frequency mid-infrared solid-state laser

Thaum ob lub laser beams nrog zaus sib txawv yog tshwm sim ntawm ib tug nonlinear siv lead ua, ib tug tshiab laser uas nws zaus yog qhov txawv ntawm zaus ntawm ob lub laser beam yog generated. Ib yam li lwm cov txheej txheem nonlinear, cov txheej txheem no yuav tsum ncav cuag qee qhov xwm txheej. Raws li qhov sib txawv zaus thev naus laus zis, cov teeb pom kev zoo hauv qhov pom ntawm 30 µm tuaj yeem tau txais, thiab feem ntau yog siv los ua kom tiav qhov tsis muaj zog infrared.

② Nruab nrab infrared parametric oscillation laser

Yog hais tias lub nonlinear nruab nrab yog muab tso rau hauv lub optical resonator, lub twj tso kua mis yog qhov teeb meem ntawm lub nonlinear siv lead ua, ua ob lub teeb tshiab tsawg zaus (lub teeb liab thiab lub teeb tsis pom kev), lub teeb pom kev zoo, teeb liab teeb, thiab lub teeb tsis muaj zog ntau zaus los ntawm lub teeb. nonlinear nruab nrab, thaum qhov nce ntawm lub teeb liab lub teeb yoj thiab lub teeb tsis ua haujlwm yog ntau dua li lawv qhov poob hauv resonator, lub laser oscillation yog tsim nyob rau hauv lub resonator.

Qhov no yog optical parametric oscillator (OPO). Los ntawm txheej txheej tsim ntawm daim iav resonator, qhov xav tau laser zaus tso zis tuaj yeem raug xaiv.

Raws li pom hauv daim duab. ωp yog lub twj tso kua mis optical zaus, ωs yog lub teeb liab optical zaus, ωi yog qhov tsis siv neeg kho qhov muag zaus, thiab ua tau raws li kev sib raug zoo ntawm ωp=ωs ntxiv rau ωi.

Lub resonator ntawm qhov kho qhov muag parametric oscillator tuaj yeem ua suab nrov rau ob qho tib si teeb liab thiab lub teeb tsis muaj zog lossis rau ib qho ntawm cov zaus. Cov qub feem ntau hu ua ob-resonance parametric oscillator (DRO), thiab tom kawg yog feem ntau hu ua ib leeg-resonance optical parametric oscillator (SRO).

Peb lub teeb propagating nyob rau hauv lub siv lead ua yuav tsum tau raws li lub sij hawm sib piv cov mob, uas yog, muaj feem xyuam rau lub refractive index ntawm lub optical wavelength nyob rau hauv lub siv lead ua, yog hais tias lub pumped lub teeb tshwm sim ntawm ib tug ruaj wavelength, qhov kev hloov ntawm refractive index ntawm lub teeb. lub nonlinear siv lead ua yuav hloov lub wavelength ntawm lub teeb liab lub teeb thiab lub teeb nyob twj ywm, thiaj li yuav tau txais ib tug tshiab theem txuam mob thiab ua tiav wavelength tuning.

Lub kaum sab xis tuaj yeem ua tiav los ntawm kev siv kev sib raug zoo ntawm anisotropic siv lead ua birefringence thiab lub kaum sab xis, lossis qhov ntsuas kub tuaj yeem ua tiav los ntawm kev hloov pauv kub. Periodic tuning tuaj yeem ua tau los ntawm kev hloov lub sij hawm siv lead ua rau lub caij nyoog polarized crystals.

Lub kaum sab xis tuaj yeem ua tiav los ntawm kev siv kev sib raug zoo ntawm anisotropic siv lead ua birefringence thiab lub kaum sab xis, lossis qhov ntsuas kub tuaj yeem ua tiav los ntawm kev hloov pauv kub. Periodic tuning tuaj yeem ua tau los ntawm kev hloov lub sij hawm siv lead ua rau lub caij nyoog polarized crystals.

Nonlinear crystals yog cov khoom tseem ceeb ntawm mid-infrared parametric oscillation lasers. Cov mid-infrared nonlinear crystals muaj xws li KTP, KTA, ZnGeP2 (ZGP), AgGaS2, LiNbO3 (LN), LiTaO3 (LT), PPLN, PPLT, PPKTP, PPKTA. PPLN, PPLT, PPKTP, thiab PPKTA belongs rau lub sij hawm-polarized crystals thiab muaj kev hloov pauv siab. Ntxiv MgO rau hauv PPLN thiab PPLT tuaj yeem txhim kho qhov kev puas tsuaj ntawm cov muaju.

Cov ntaub ntawv tiv tauj:

Yog tias koj muaj lus nug, thov hu rau peb. Txawm peb cov neeg muas zaub nyob qhov twg thiab peb cov kev xav tau yog dab tsi, peb yuav ua raws li peb lub hom phiaj los muab peb cov neeg siv khoom zoo, tus nqi qis, thiab kev pabcuam zoo tshaj plaws.