Kev tsim txoj kev kho qhov muag ntawm cov laser polarized fiber narrow-linewidth

Kev tsim txoj kev kho qhov muag ntawm cov fiber polarizedlaser kab nqaim

1. Txheej txheem cej luam

1018 nm polarized fiber narrow-linewidth laser. Lub wavelength ua haujlwm yog 1018 nm, lub zog tso zis laser yog 104 W, qhov dav spectral ntawm 3 dB thiab 20 dB yog ~ 21 GHz thiab ~ 72 GHz feem, qhov piv txwv polarization extinction yog > 17.5 dB, thiab qhov zoo ntawm lub teeb yog siab (2 x M - 1.62 thiab 2 y M) Alub tshuab lasernrog kev ua haujlwm ntawm qhov nqes hav ntawm 79% (~1.63).

2. Kev piav qhia txog txoj kev kho qhov muag

Hauv ib qholaser polarized fiber narrow-linewidth, lub linearly polarized fiber laser oscillator yog tsim los ntawm ib khub ntawm polarization-tswj fiber gratings thiab 1.5-meter-ntev 10/125 μm ytterbium-doped ob-clad polarization-tswj fiber ua qhov nce nruab nrab. Lub coefficient absorption ntawm cov optical fiber no ntawm 976 nm yog 5 dB / m. Lub laser oscillator yog pumped los ntawm 976 nm wavelength-xauvlaser semiconductornrog lub zog siab tshaj plaws ntawm 27 W los ntawm lub polarity-maintaining (1 + 1) × 1 beam combiner. Lub grating siab reflection muaj qhov reflectivity ntawm ntau dua 99%, thiab 3 dB reflection bandwidth yog kwv yees li 0.22 nm. Qhov reflectivity qis ntawm lub grating yog 40%, thiab 3 dB reflection bandwidth yog kwv yees li 0.216 nm. Lub wavelengths reflection nruab nrab ntawm ob lub gratings yog ntawm 1018 nm. Txhawm rau kom sib npaug lub zog tso zis ntawm lub laser resonator thiab ASE suppression ratio, qhov reflectivity qis ntawm lub grating tau optimized rau 40%. Lub tail fiber ntawm lub high-reflection grating yog fused rau lub gain fiber, thaum lub tail fiber ntawm lub low-reflection grating yog tig 90 ° thiab fused rau lub tail fiber ntawm lub cladding lim. Yog li, qhov chaw siab tshaj plaws ntawm qhov ceev-axis reflection wavelength ntawm lub high-reflection grating phim qhov ntawm qhov qeeb-axis reflection wavelength ntawm lub low-reflection grating. Ua li no, tsuas yog ib lub laser polarized thiaj li oscillate tau hauv lub resonant cavity. Lub teeb twj tso kua mis seem hauv lub optical fiber cladding yog lim tawm los ntawm lub lim dej cladding tus kheej ua fused rau hauv lub resonant cavity, thiab cov zis pigtail yog beveled los ntawm 8 ° kom tiv thaiv kev tawm tswv yim kawg thiab parasitic oscillation.

3. Kev paub txog keeb kwm yav dhau los

Lub tshuab tsim cov lasers fiber linearly polarized: Vim muaj kev ntxhov siab birefringence, cov fiber polarization-maintaining fiber zoo li pear muaj ob lub orthogonal polarization axes, hu ua lub axis ceev thiab lub axis qeeb. Feem ntau, txij li thaum lub refractive index ntawm lub axis qeeb yog ntau dua li ntawm lub axis ceev, lub grating sau rau ntawm lub polarization-maintaining fiber muaj ob lub wavelengths sib txawv. Lub resonant cavity ntawm lub linearly polarized fiber laser feem ntau yog tsim los ntawm ob lub polarization-maintaining gratings. Lub wavelengths ntawm lub low-reflection grating thiab lub high-reflection grating ntawm lub axis ceev thiab lub axis qeeb sib xws. Thaum lub reflection bandwidth ntawm lub polarization-maintaining grating nqaim txaus, cov spectra kis tau tus mob hauv lub axis ceev thiab lub axis qeeb tuaj yeem sib cais, thiab ob lub wavelengths tuaj yeem co hauv lub resonant cavity. Raws li lub hauv paus ntsiab lus dual-wavelength oscillation ntawm lub polarization-maintaining grating, hauv kev sim, txoj kev vuam sib luag tuaj yeem raug saws los ua tiav nws. Thaum lub sijhawm vuam, cov kab sib txuas ntawm ob lub gratings raug sib dhos. Ua li no, ob lub ncov kis ntawm lub grating siab-reflection sib raug rau cov ntawm lub grating qis-reflection, thiab yog li ob-wavelength laser tso zis tuaj yeem ua tiav.

Hauv cov tshuab tswj hwm polarization laser tiag tiag, linear skew yog ib qho cim qhia tseem ceeb rau kev ntsuam xyuas cov yam ntxwv ntawm cov lasers linearly polarized. Feem ntau, lub sijhawm ntawm lub grating siab-reflectance yog ntau dua li ntawm lub grating qis-reflectance. Yuav kom ua tiav lub laser linearly polarized nrog tus nqi PER siab, tsuas yog ib lub ncov polarization yuav tsum co. Thaum lub axis ceev ntawm lub grating qis-reflectance nyob raws lub axis qeeb ntawm lub grating siab-reflectance, Lub wavelength nruab nrab hauv qhov kev taw qhia ceev ntawm lub grating qis-reflectance sib raug rau qhov ntawd hauv qhov kev taw qhia qeeb ntawm lub grating siab-reflectance, thaum lub ncov kis tau hauv qhov kev taw qhia qeeb ntawm lub grating qis-reflection tsis sib raug rau lub ncov kis tau hauv qhov kev taw qhia ceev ntawm lub grating siab-reflection. Ua li no, ib lub ncov kis tau tuaj yeem co. Ib yam li ntawd, thaum lub axis qeeb ntawm lub grating qis-reflectance nyob raws lub axis ceev ntawm lub grating siab-reflectance, lub wavelength nruab nrab ntawm lub axis qeeb ntawm lub grating qis-reflectance sib raug rau qhov ntawm lub axis ceev ntawm lub grating siab-reflectance, thaum lub ncov kis ntawm lub axis ceev ntawm lub grating qis-reflectance tsis sib raug rau qhov ntawm lub axis qeeb ntawm lub grating siab-reflectance. Ua li no, ib lub ncov kis kuj tuaj yeem vibrated. Ob qho tib si ntawm ob txoj kev saum toj no tuaj yeem ua tiav cov zis laser linearly polarized. Raws li lub hauv paus ntsiab lus laser oscillation linearly polarized ib-wavelength ntawm lub polarization-maintaining grating, hauv kev sim, txoj kev orthogonal splicing tuaj yeem raug saws los ua tiav nws. Thaum lub kaum sab xis ntawm cov polarization-maintaining axes ntawm lub grating siab reflection thiab lub grating qis reflection yog 90 °, lub ncov kis tau tus mob hauv qhov kev taw qhia qeeb ntawm lub grating siab reflection sib raug rau lub ncov kis tau tus mob hauv qhov kev taw qhia ceev ntawm lub grating qis reflection, thiab yog li cov zis ntawm ib-wavelength linearly polarized fiber laser tuaj yeem paub.