Optical txoj kev tsim ntawm polarized fiber nqaim-linewidth laser

Optical txoj kev tsim ntawm polarized fiber ntaunqaim-linewidth laser

1. Txheej txheem cej luam

1018nm polarized fiber nqaim-linewidth laser. Lub wavelength ua hauj lwm yog 1018 nm, lub laser tso zis hwj chim yog 104 W, lub spectral dav ntawm 3 dB thiab 20 dB yog ~ 21 GHz thiab ~ 72 GHz feem, lub polarization extinction ratio yog> 17.5 dB, thiab lub beam zoo yog siab (2 x M - 1.6 M2)laser systemnrog txoj kab nqes kev ua haujlwm ntawm 79% (∼1.63).

2. Optical txoj kev piav qhia

Hauv ibpolarized fiber nqaim-linewidth laser, linearly polarized fiber ntau laser oscillator yog tsim los ntawm ib khub ntawm polarization-tswj fiber ntau gratings thiab 1.5-meter-ntev 10/125 μm ytterbium-doped ob-clad polarization-tso fiber ntau li qhov nruab nrab nce. Qhov nqus coefficient ntawm fiber ntau optical ntawm 976 nm yog 5 dB / m. Lub laser oscillator yog pumped los ntawm 976 nm wavelength-lockedsemiconductor lasernrog lub zog siab tshaj plaws ntawm 27 W los ntawm kev tswj xyuas polarity (1 + 1) × 1 beam combiner. Lub siab xav grating muaj qhov cuam tshuam ntau dua 99%, thiab 3 dB qhov kev xav bandwidth yog kwv yees li 0.22 nm. Qhov tsis tshua muaj kev cuam tshuam ntawm cov grating yog 40%, thiab 3 dB reflection bandwidth yog kwv yees li 0.216 nm. Qhov nruab nrab qhov cuam tshuam wavelengths ntawm ob lub gratings yog nyob ntawm 1018 nm. Txhawm rau sib npaug ntawm cov zis hluav taws xob ntawm lub laser resonator thiab ASE inhibition piv, qhov tsis tshua muaj kev cuam tshuam ntawm cov grating tau ua kom zoo rau 40%. Tus Tsov tus tw fiber ntau ntawm high-reflection grating yog fused rau qhov nce fiber ntau, thaum tus Tsov tus tw fiber ntau ntawm qhov qis-reflection grating yog tig 90 ° thiab fused mus rau tus Tsov tus tw fiber ntawm cladding lim. Yog li, lub ncov txoj hauj lwm ntawm lub ceev-axis reflection wavelength ntawm high-reflection grating matches ntawm lub qeeb-axis reflection wavelength ntawm low-reflection grating. Ua li no, tsuas yog ib qho polarized laser tuaj yeem oscillate hauv cov kab noj hniav resonant. Cov twj tso kua mis ntxiv nyob rau hauv optical fiber cladding yog lim tawm los ntawm nws tus kheej-ua cladding lim fused rau hauv resonant kab noj hniav, thiab cov zis pigtail yog beveled los ntawm 8 ° los tiv thaiv kawg lub ntsej muag tawm tswv yim thiab parasitic oscillation.

3. Keeb kwm kev paub

Cov txheej txheem tiam ntawm linearly polarized fiber ntau lasers: Vim muaj kev ntxhov siab birefringence, pear-puab polarization-tso fiber ntau muaj ob lub orthogonal polarization axes, hu ua axis ceev thiab qeeb axis. Feem ntau, txij li qhov ntsuas qhov ntsuas ntawm qhov qeeb axis yog ntau dua li ntawm qhov ceev axis, cov grating sau rau ntawm lub polarization-tswj fiber ntau muaj ob qhov sib txawv nruab nrab wavelengths. Lub resonant kab noj hniav ntawm ib tug linearly polarized fiber ntau laser feem ntau yog tsim los ntawm ob tug polarization-tswj gratings. Lub wavelengths ntawm lub low-reflection grating thiab high-reflection grating ntawm lub nrawm axis thiab qeeb axis sib haum. Thaum qhov kev xav bandwidth ntawm lub polarization-tswj grating yog nqaim txaus, qhov kis tau tus mob nyob rau hauv qhov ceev axis thiab qeeb axis cov lus qhia tuaj yeem sib cais, thiab ob qho tib si wavelengths tuaj yeem vibrate nyob rau hauv lub resonant kab noj hniav. Raws li lub hauv paus ntsiab lus dual-wavelength oscillation ntawm lub polarization-tswj grating, hauv kev sim, txoj kev sib txuas vuam tuaj yeem raug coj los ua kom tiav. Thaum lub sij hawm welding, lub polarization-tswj axes ntawm ob gratings yog ua raws. Nyob rau hauv txoj kev no, ob qho tib si kis tau tus mob ntawm high-reflection grating sib haum mus rau cov uas tsis tshua muaj-reflection grating, thiab yog li dual-wavelength laser tso zis yuav tsum tau paub.

Nyob rau hauv qhov tseeb laser polarization-kev tuav tswj systems, linear skew yog ib qho tseem ceeb qhia rau kev ntsuam xyuas cov zis cov yam ntxwv ntawm linearly polarized lasers. Feem ntau, lub sij hawm ntawm high-reflectance grating yog ntau dua li qhov tsawg-reflectance grating. Txhawm rau ua tiav cov kab hluav taws xob polarized nrog tus nqi siab PER, tsuas yog ib qho polarization ncov yuav tsum tau co. Thaum lub ceev axis ntawm lub low-reflectance grating yog raws lub qeeb axis ntawm high-reflectance grating, lub nruab nrab wavelength nyob rau hauv lub ceev axis kev taw qhia ntawm lub low-reflection grating sib raug mus rau qhov uas nyob rau hauv lub qeeb axis kev taw qhia ntawm lub high-reflection grating, thaum lub sij hawm kis tau tus mob ncov nyob rau hauv lub qeeb axis kev taw qhia ntawm lub low-reflection grating tsis ceev. axis kev taw qhia ntawm high-reflection grating. Nyob rau hauv txoj kev no, ib qho kev sib kis siab tshaj plaws tuaj yeem vibrated. Ib yam li ntawd, thaum lub axis qeeb ntawm qhov qis-reflectance grating yog raws qhov ceev axis ntawm high-reflectance grating, lub nruab nrab wavelength ntawm qeeb axis ntawm low-reflectance grating sib haum mus rau qhov ceev axis ntawm high-reflectance grating, thaum lub sij hawm xa mus ncov ntawm qhov ceev axis ntawm lub grating qeeb tsis ref. ntawm high-reflectance grating. Nyob rau hauv txoj kev no, ib qho kev xa tawm ncov kuj tuaj yeem vibrated. Ob qho tib si saum toj no ob txoj kev tuaj yeem ua tiav linearly polarized laser tso zis. Raws li ib leeg-wavelength linearly polarized laser oscillation txoj cai ntawm lub polarization-tswj grating, nyob rau hauv kev sim, txoj kev orthogonal splicing yuav raug saws los ua kom tiav. Thaum lub splicing lub kaum sab xis ntawm lub polarization-tswj axes ntawm lub siab reflection grating thiab qhov tsawg reflection grating yog 90 °, lub ncov kis tau tus mob nyob rau hauv lub qeeb axis kev taw qhia ntawm lub siab reflection grating sib raug mus rau cov kis tau tus mob ncov nyob rau hauv lub ceev axis kev taw qhia ntawm lub low reflection grating, thiab yog li qhov tso zis ntawm ib leeg-waveleng laser tau paub lawm.