I-laser enamandla amakhulu e-pulsed enesakhiwo se-MOPA esine-fiber yonke

I-laser enamandla amakhuluenesakhiwo se-MOPA esine-fiber yonke

Izinhlobo eziyinhloko zesakhiwo sama-fiber lasers zifaka phakathi i-single resonator, inhlanganisela ye-beam kanye nezakhiwo ze-master oscillating power amplifier (MOPA). Phakathi kwazo, isakhiwo se-MOPA sesibe ngesinye sezindawo ezithandwa kakhulu ocwaningweni ngenxa yamandla aso okufeza ukusebenza okuphezulu.i-laser evuvukileokukhiphayo okunobubanzi be-pulse obulungisekayo kanye nemvamisa yokuphindaphinda (okubizwa ngokuthi ububanzi be-pulse kanye nemvamisa yokuphindaphinda).

Isimiso sokusebenza se-laser ye-MOPA simi kanje: I-oscillator eyinhloko (MO) ingumthombo wembewu osebenza kahle kakhulu.i-laser ye-semiconductorokukhiqiza ukukhanya kwesignali yembewu ngamapharamitha alungisekayo ngokusebenzisa i-direct pulse modulation. Ukulawula okuyinhloko kwe-Field Programmable gate Array (FPGA) kukhipha izimpawu zamanje ze-pulse ngamapharamitha alungisekayo, alawulwa yi-drive circuit ukuze kusetshenziswe umthombo wembewu futhi kuqedele i-modulation yokuqala yokukhanya kwembewu. Ngemva kokuthola imiyalelo yokulawula ebhodini lokulawula eliyinhloko le-FPGA, i-pump source drive circuit iqala umthombo wepompo ukuze ikhiqize ukukhanya kwepompo. Ngemva kokuba ukukhanya kwembewu kanye nokukhanya kwepompo kuhlanganiswe yi-beam splitter, kufakwa ngokulandelana ku-Yb3+ -doped double-clad optical fiber (YDDCF) ku-module ye-optical amplification yezigaba ezimbili. Phakathi nale nqubo, ama-ion e-Yb3+ amunca amandla okukhanya kwepompo ukuze akhe ukusatshalaliswa kokuguquguquka kwabantu. Ngemva kwalokho, ngokusekelwe ezimisweni zokukhulisa amagagasi okuhambayo kanye nokukhishwa okushukunyisiwe, ukukhanya kwesignali yembewu kufinyelela ekuzuzeni kwamandla aphezulu ku-module ye-optical amplification yezigaba ezimbili, ekugcineni kukhiphe amandla aphezulu.i-laser ye-nanosecond pulsedNgenxa yokwanda kwamandla aphezulu, isignali ye-pulse ekhulisiwe ingase ibhekane nokucindezelwa kobubanzi be-pulse ngenxa yomphumela we-gain clamping. Ezisetshenzisweni ezisebenzayo, izakhiwo zokukhulisa ezinezigaba eziningi zivame ukwamukelwa ukuze kuthuthukiswe amandla okukhipha futhi kutholakale ukusebenza kahle.

Uhlelo lwesekethe ye-laser ye-MOPA lwakhiwe yibhodi lokulawula eliyinhloko le-FPGA, umthombo wephampu, umthombo wembewu, ibhodi lesekethe lomshayeli, i-amplifier, njll. Ibhodi lokulawula eliyinhloko le-FPGA liqhuba umthombo wembewu ukuze ukhiphe ukukhanya kwembewu eluhlaza okusezinga le-MW ngamapharamitha alungisekayo ngokukhiqiza izimpawu zikagesi ze-pulse ezinama-waveform alungisekayo, ububanzi be-pulse (5 kuya ku-200ns), kanye namazinga okuphindaphinda (30 kuya ku-900kHz). Lesi siginali sifakwa nge-isolator kumoduli yokukhulisa ukukhanya yezigaba ezimbili eyakhiwe yi-preamplifier kanye ne-amplifier eyinhloko, futhi ekugcineni sikhipha i-laser ye-short-pulse enamandla aphezulu nge-optical isolator enomsebenzi we-collimation. Umthombo wembewu ufakwe i-photodetector yangaphakathi ukuze iqaphe amandla okukhipha ngesikhathi sangempela futhi iwabuyisele ebhodini lokulawula eliyinhloko le-FPGA. Ibhodi lokulawula eliyinhloko lilawula amasekethe okushayela iphampu 1 no-2 ukuze kufezwe imisebenzi yokuvula nokuvala yemithombo yephampu 1, 2 no-3. Laphoumshini wokuthola izithombeuma yehluleka ukubona ukukhanya kwesiginali okuphumayo, ibhodi lokulawula eliyinhloko lizovala umthombo wephampu ukuvimbela umonakalo kumadivayisi e-YDDCF kanye namadivayisi okukhanya ngenxa yokuntuleka kokufakwa kokukhanya kwembewu.

Uhlelo lwe-MOPA laser optical path lusebenzisa isakhiwo se-fiber yonke futhi luqukethe i-module eyinhloko ye-oscillation kanye ne-module ye-amplification enezigaba ezimbili. I-module eyinhloko ye-oscillation ithatha i-semiconductor laser diode (LD) enobude obuphakathi obungu-1064nm, ububanzi obungu-3nm, kanye namandla aphezulu okukhipha aqhubekayo angu-400mW njengomthombo wembewu, futhi iyihlanganisa ne-fiber Bragg grating (FBG) enokukhanya okungu-99%@1063.94nm kanye nobubanzi obungu-3.5nm ukwakha uhlelo lokukhetha ubude obungu-wavelength. I-module ye-amplification enezigaba ezimbili isebenzisa umklamo we-reverse pump, kanti i-YDDCF enobubanzi obungu-8 no-30μm ihlelwe ngokulandelana njenge-gain media. Ama-coefficients okumunca i-coating pump ahambisanayo angu-1.0 no-2.1dB/m@915nm, ngokulandelana.