Laser yothamanga kwambiri yokhala ndi MOPA yokhala ndi ulusi wonse

Laser yothamanga kwambiriyokhala ndi MOPA yokhala ndi ulusi wonse

Mitundu ikuluikulu ya kapangidwe ka fiber lasers ndi monga single resonator, beam combination ndi master oscillating power amplifier (MOPA). Pakati pawo, kapangidwe ka MOPA kakhala imodzi mwa malo ofufuzira omwe alipo chifukwa cha kuthekera kwake kochita bwino kwambiri.laser yozungulirakutulutsa ndi m'lifupi mwa kugunda kwa mtima kosinthika ndi pafupipafupi yobwerezabwereza (yotchedwa m'lifupi mwa kugunda kwa mtima ndi pafupipafupi yobwerezabwereza).

Mfundo yogwirira ntchito ya laser ya MOPA ndi iyi: Chotsukira chachikulu (MO) ndi gwero la mbewu logwira ntchito bwino kwambiri.laser ya semiconductorzomwe zimapanga kuwala kwa chizindikiro cha mbewu ndi magawo osinthika kudzera mu direct pulse modulation. Field Programmable gate Array (FPGA) main control imatulutsa ma pulse current signals ndi magawo osinthika, omwe amayendetsedwa ndi drive circuit kuti agwiritse ntchito gwero la mbewu ndikumaliza modulation yoyamba ya kuwala kwa mbewu. Pambuyo polandira malangizo owongolera kuchokera ku FPGA main control board, circuit yoyendetsera gwero la pump imayamba gwero la pump kuti ipange kuwala kwa pump. Pambuyo poti kuwala kwa mbewu ndi kuwala kwa pump zilumikizidwa ndi beam splitter, zimalowetsedwa mu Yb3+ -doped double-clad optical fiber (YDDCF) mu two-stage optical amplification module. Panthawiyi, ma Yb3+ ion amayamwa mphamvu ya kuwala kwa pump kuti apange population inversion distribution. Pambuyo pake, kutengera mfundo za traveling wave amplification ndi stimulated emission, kuwala kwa chizindikiro cha mbewu kumapeza mphamvu yayikulu mu two-stage optical amplification module, pamapeto pake kutulutsa mphamvu yayikulu.laser yozungulira ya nanosecondChifukwa cha kuwonjezeka kwa mphamvu ya peak, chizindikiro cha pulse chokwezedwa chingakumane ndi kupsinjika kwa pulse width chifukwa cha gain clamping effect. Mu ntchito zenizeni, mapangidwe a multi-step amplification nthawi zambiri amagwiritsidwa ntchito kuti apititse patsogolo mphamvu yotulutsa ndikupeza bwino.

Dongosolo la MOPA laser circuit limapangidwa ndi bolodi lalikulu lolamulira la FPGA, gwero la pampu, gwero la mbewu, bolodi la dalaivala, amplifier, ndi zina zotero. Bolodi lalikulu lolamulira la FPGA limayendetsa gwero la mbewu kuti litulutse kuwala kwa mbewu zosaphika kwa MW-level ndi magawo osinthika popanga zizindikiro zamagetsi zamagetsi zokhala ndi ma waveforms osinthika, kutalika kwa pulse (5 mpaka 200ns), ndi kuchuluka kobwerezabwereza (30 mpaka 900kHz). Chizindikiro ichi chimalowetsedwa kudzera mu cholekanitsa kupita ku gawo la optical amplification la magawo awiri lopangidwa ndi preamplifier ndi amplifier yayikulu, ndipo pamapeto pake limatulutsa laser yaifupi yamphamvu kwambiri kudzera mu optical isolator yokhala ndi collimation function. Gwero la mbewu lili ndi chowunikira chamkati kuti chiziyang'anira mphamvu yotulutsa nthawi yeniyeni ndikuyibwezera ku bolodi lalikulu lolamulira la FPGA. Bolodi lalikulu lolamulira limayang'anira mabwalo oyendetsa pampu 1 ndi 2 kuti akwaniritse ntchito zotsegulira ndi kutseka magwero a pampu 1, 2 ndi 3. Pamenechowunikira zithunziNgati yalephera kuzindikira kuwala kwa chizindikiro, bolodi lalikulu lowongolera lidzatseka gwero la pampu kuti lisawononge YDDCF ndi zida zowunikira chifukwa cha kusowa kwa kuwala kwa mbewu.

Dongosolo la njira ya kuwala ya laser ya MOPA limagwiritsa ntchito kapangidwe ka ulusi wonse ndipo limakhala ndi gawo lalikulu la oscillation ndi gawo la amplification la magawo awiri. Gawo lalikulu la oscillation limatenga semiconductor laser diode (LD) yokhala ndi kutalika kwa mafunde kwapakati kwa 1064nm, mulifupi wa mzere wa 3nm, ndi mphamvu yayikulu yotulutsa yopitilira ya 400mW ngati gwero la mbewu, ndikuiphatikiza ndi fiber Bragg grating (FBG) yokhala ndi reflectivity ya 99%@1063.94nm ndi mulifupi wa mzere wa 3.5nm kuti ipange dongosolo losankha wavelength. Gawo la amplification la magawo awiri limagwiritsa ntchito kapangidwe ka reverse pump, ndipo YDDCF yokhala ndi mainchesi apakati a 8 ndi 30μm imakonzedwa motsatana ngati gain media. Ma coefficients ofanana a coating pump absorption ndi 1.0 ndi 2.1dB/m@915nm, motsatana.