I-laser enamandla aphezulu evulwa nge-pulsed enesakhiwo se-MOPA esinefayibha yonke

I-laser enamandla aphezuluenesakhiwo se-MOPA esinefayibha yonke

Iintlobo eziphambili zesakhiwo se-fiber lasers ziquka i-single resonator, i-beam combination kunye ne-master oscillating power amplifier (MOPA). Phakathi kwazo, isakhiwo se-MOPA siye saba sesinye sezona ndawo ziphambili zophando ngenxa yokukwazi kwaso ukufikelela kwizinga eliphezulu lokusebenza.i-pulsed laserimveliso enobubanzi be-pulse obuhlengahlengiswayo kunye ne-repetition frequency (ebizwa ngokuba bububanzi be-pulse kunye ne-repetition frequency).

Umgaqo wokusebenza we-laser ye-MOPA ngolu hlobo lulandelayo: I-oscillator ephambili (MO) ngumthombo wembewu osebenza kakuhle.i-laser ye-semiconductorovelisa ukukhanya kwesignali yembewu ngeeparameter ezihlengahlengiswayo ngokusebenzisa i-direct pulse modulation. Ulawulo oluphambili lwe-Field Programmable gate Array (FPGA) lukhupha imiqondiso yangoku ye-pulse eneparameters ezihlengahlengiswayo, ezilawulwa yi-drive circuit ukuze zisebenzise umthombo wembewu kwaye zigqibezele i-modulation yokuqala yokukhanya kwembewu. Emva kokufumana imiyalelo yokulawula kwibhodi yokulawula ephambili ye-FPGA, i-pump source drive circuit iqala umthombo wepompo ukuvelisa ukukhanya kwepompo. Emva kokuba ukukhanya kwembewu kunye nokukhanya kwepompo zidityaniswe yi-beam splitter, zifakwa ngokulandelelana kwi-Yb3+ -doped double-clad optical fiber (YDDCF) kwi-two-stage optical amplification module. Ngexesha lale nkqubo, ii-Yb3+ ions zifunxa amandla okukhanya kwepompo ukuze zenze usasazo lwe-population inversion. Emva koko, ngokusekelwe kwimigaqo yokukhulisa amaza okuhamba kunye nokukhupha okukhuthazwayo, ukukhanya kwesignali yembewu kufikelela kwi-high power gain kwi-two-stage optical amplification module, ekugqibeleni kuphume amandla aphezulu.i-laser eshukumayo ye-nanosecondNgenxa yokwanda kwamandla aphezulu, isignali ye-pulse eyandisiweyo inokufumana uxinzelelo lobubanzi be-pulse ngenxa yesiphumo sokubambelela kwe-gain. Kwizicelo ezisebenzayo, izakhiwo zokukhulisa ezinamanqanaba amaninzi zihlala zisetyenziswa ukuphucula amandla okukhupha kunye nokusebenza kakuhle.

Inkqubo yesekethe yelaser ye-MOPA yenziwe yibhodi yokulawula ephambili ye-FPGA, umthombo wepompo, umthombo wembewu, ibhodi yesekethe yomqhubi, i-amplifier, njl. Ibhodi yokulawula ephambili ye-FPGA iqhuba umthombo wembewu ukuba ukhuphe iipulses zokukhanya kwembewu eluhlaza zenqanaba le-MW ezineeparameter ezihlengahlengiswayo ngokuvelisa imiqondiso yombane yepulse ene-waveforms ezihlengahlengiswayo, ububanzi bepulse (5 ukuya kwi-200ns), kunye namazinga okuphindaphinda (30 ukuya kwi-900kHz). Le signal ifakwa nge-isolator kwimodyuli yokukhulisa i-optical enamanqanaba amabini eyenziwe yi-preamplifier kunye ne-amplifier ephambili, kwaye ekugqibeleni ikhupha i-laser ye-short-pulse enamandla aphezulu nge-optical isolator enomsebenzi we-collimation. Umthombo wembewu uxhotyiswe nge-photodetector yangaphakathi yokujonga amandla okukhupha ngexesha langempela kwaye iwabuyisele kwibhodi yokulawula ephambili ye-FPGA. Ibhodi yokulawula ephambili ilawula iisekethe zokuqhuba ipompo 1 kunye ne-2 ukufezekisa imisebenzi yokuvula nokuvala imithombo yepompo 1, 2 kunye ne-3. Xaisixhobo sokubona iifotoUkuba ayikwazanga ukubona ukukhanya kwesiginali, ibhodi yokulawula ephambili iya kuyicima ipompo yomthombo ukuthintela umonakalo kwi-YDDCF kunye nezixhobo zokukhanya ngenxa yokunqongophala kokukhanya kwembewu.

Inkqubo ye-MOPA laser optical path isebenzisa isakhiwo se-all-fiber kwaye iqulathe i-main oscillation module kunye ne-two-stage amplification module. I-main oscillation module ithatha i-semiconductor laser diode (LD) enobude obuphakathi be-1064nm, ububanzi bomgca we-3nm, kunye namandla aphezulu okukhupha aqhubekayo angama-400mW njengomthombo wembewu, kwaye iyidibanisa ne-fiber Bragg grating (FBG) enokukhanya kwe-99%@1063.94nm kunye nobubanzi bomgca we-3.5nm ukwenza inkqubo yokukhetha ubude bomgca we-wavelength. I-2-stage amplification module isebenzisa uyilo lwe-reverse pump, kwaye i-YDDCF ene-core diameters ye-8 kunye ne-30μm icwangciswe ngokulandelelana njenge-gain media. Ii-coefficients zokufunxa i-coating pump ezihambelanayo ziyi-1.0 kunye ne-2.1dB/m@915nm, ngokulandelelana.