Optical njira kapangidwe ka polarized CHIKWANGWANI yopapatiza-linewidth laser

Optical njira kapangidwe ka polarized CHIKWANGWANIyopapatiza-linewidth laser

1. Mwachidule

1018 nm polarized CHIKWANGWANI yopapatiza-linewidth laser. Kutalika kogwira ntchito ndi 1018 nm, mphamvu yotulutsa laser ndi 104 W, mawonekedwe owoneka bwino a 3 dB ndi 20 dB ndi ~ 21 GHz ndi ~ 72 GHz motsatana, chiŵerengero cha kutha kwa polarization ndi> 17.5 dB, ndipo khalidwe la mtengo ndilokwera (2 x M - 2 1.62 A) ndi A.laser systemndi kutsetsereka kwa 79% (∼1.63).

2. Kufotokozera njira

Mu apolarized CHIKWANGWANI yopapatiza-linewidth laser, linearly polarized fiber laser oscillator imapangidwa ndi ma polarization-kusunga fiber gratings ndi 1.5-mita-yautali 10/125 μm ytterbium-doped double-clad polarization-kusunga CHIKWANGWANI monga njira yopezera phindu. Mayamwidwe a fiber fiber iyi pa 976 nm ndi 5 dB/m. Laser oscillator imapopedwa ndi 976 nm wavelength-yotsekedwalaser semiconductorndi mphamvu yaikulu ya 27 W kupyolera mu polarity-kusunga (1 + 1) × 1 mtengo chophatikizira. Kuwala kowoneka bwino kumakhala ndi chiwonetsero chopitilira 99%, ndipo 3 dB reflection bandwidth ndi pafupifupi 0.22 nm. Kuwoneka kochepa kwa grating ndi 40%, ndipo 3 dB reflection bandwidth pafupifupi 0.216 nm. Mawonekedwe apakati owonetsera ma grating onse ali pa 1018 nm. Kuti muchepetse mphamvu zotulutsa za laser resonator ndi kuchuluka kwa kuponderezana kwa ASE, kuwunikira kotsika kwa grating kunakongoletsedwa mpaka 40%. Ulusi wa mchira wa grating wowoneka bwino umasakanikirana ndi ulusi wopeza, pomwe ulusi wa mchira wa grating wocheperako umazunguliridwa ndi 90 ° ndikusakanikirana ndi ulusi wa mchira wa fyuluta ya cladding. Choncho, nsonga ya nsonga ya kutalika kwa mawonekedwe a axis-axis reflection wavelength ya grating yapamwamba yowonetserako ikufanana ndi yapang'onopang'ono yowonetsera mawonekedwe a mawonekedwe otsika a grating. Mwanjira iyi, laser imodzi yokha yopangidwa ndi polarized imatha kuyendayenda m'matumbo a resonant. Kuwala kwapampu kotsalira mu kuwala kwa fiber cladding kumasefedwa ndi fyuluta yodzipangira yokha yomwe imasakanikirana ndi phokoso la resonant, ndipo pigtail yotulutsa imagwedezeka ndi 8 ° kuti iteteze mapeto a nkhope ndi kutsekemera kwa parasitic.

3. Chidziwitso chambiri

Makina opangira ma lasers opangidwa ndi ma polarized fiber: Chifukwa cha kupsinjika kwa birefringence, ulusi wokhala ndi mawonekedwe a peyala uli ndi nkhwangwa ziwiri za orthogonal polarization, zomwe zimadziwika kuti axis yothamanga komanso axis pang'onopang'ono. Nthawi zambiri, popeza index ya refractive ya axis pang'onopang'ono ndi yayikulu kuposa ya axis yothamanga, grating yolembedwa pa polarization-intaining fiber imakhala ndi mafunde awiri apakati. Pang'onopang'ono pawotchi ya linearly polarized fiber laser nthawi zambiri imakhala ndi ma grating awiri osunga polarization. Mafunde ang'onoang'ono a grating otsika kwambiri komanso okwera kwambiri omwe amawombera pamtunda wothamanga komanso pang'onopang'ono amagwirizana motsatira. Pamene chiwonetsero cha bandwidth ya grating yosunga polarization ndi yopapatiza mokwanira, mawonekedwe opatsirana mu axis yothamanga ndi mayendedwe oyenda pang'onopang'ono amatha kupatulidwa, ndipo mafunde onsewa amatha kugwedezeka mkati mwa nsonga yowumbira. Malinga ndi mfundo yapawiri-wavelength oscillation ya polarization-kusunga grating, pakuyesa, njira yowotcherera yofananira ingatengedwe kuti ikwaniritse. Pa kuwotcherera, nkhwangwa zosunga polarization za ma grating awiriwo zimalumikizidwa. Mwanjira iyi, nsonga ziwiri zopatsirana za grating zowoneka bwino kwambiri zimafanana ndi zomwe zimakhala zocheperako, motero kutulutsa kwa laser kwapawiri-wavelength kumatha kuchitika.

M'makina enieni osungira ma laser polarization, skew ya mzere ndi chizindikiro chofunikira pakuwunika mawonekedwe a ma lasers opangidwa ndi polarized. Nthawi zambiri, nthawi ya grating yowoneka bwino kwambiri ndi yayikulu kuposa ya kabati yocheperako. Kuti mukwaniritse laser polarized ndi mtengo wapamwamba wa PER, nsonga imodzi yokha ya polarization iyenera kugwedezeka. Pamene nsonga yothamanga ya grating yotsika-reflectance ili pafupi ndi nsonga yapang'onopang'ono ya grating yowonekera kwambiri, kutalika kwapakati pa njira yofulumira ya grating yotsika-reflection ikufanana ndi yomwe imayendera pang'onopang'ono pa grating yowonekera kwambiri, pamene nsonga ya kufalikira kumtunda wapang'onopang'ono sikugwirizana ndi njira yochepetsera yomwe imadutsa pamtunda wa grating. kabati wapamwamba kwambiri. Mwanjira iyi, nsonga imodzi yotumizira imatha kugwedezeka. Momwemonso, pamene kagawo kakang'ono ka kabati kakang'ono kakang'ono kamene kali pafupi ndi kabati kakang'ono kameneka kameneka kamakhala kothamanga kwambiri, kutalika kwapakati pa kabati kakang'ono kameneka kamakhala kofanana ndi kakombo kakang'ono kameneka kamene kalikonse kamene kamawonekera, pamene nsonga yotumizira siimayenderana ndi axis yotsika kwambiri. chowotcha kwambiri. Mwanjira iyi, nsonga imodzi yotumizira imathanso kugwedezeka. Njira ziwiri zomwe zili pamwambazi zitha kukwaniritsa kutulutsa kwa laser polarized. Malinga ndi mfundo ya single-wavelength linearly polarized laser oscillation mfundo ya polarization-kusunga grating, mukuyesera, njira ya orthogonal splicing ingatengedwe kuti ikwaniritse. Pamene splicing Axis ya nkhwangwa polarization-kusamalira kabati mkulu chinyezimira kabati ndi otsika kunyezimira kabati ndi 90 °, nsonga kufala mu axis pang'onopang'ono kabati yonyezimira kabati mkulu chimafanana ndi nsonga kufala mu othamanga othamanga malangizo otsika kabati kabati, motero linanena bungwe la single-wavelength fiber linear akhoza anazindikira single-wavelength linear.