Kafukufuku waposachedwa pa ma laser a semiconductor amitundu iwiri

Kafukufuku waposachedwa pa ma laser a semiconductor amitundu iwiri

Ma laser a semiconductor disc (SDL lasers), omwe amadziwikanso kuti vertical external cavity surface-emitting lasers (VECSEL), akope chidwi chachikulu m'zaka zaposachedwa. Amaphatikiza ubwino wa semiconductor gain ndi solid-state resonators. Sikuti amangochepetsa bwino malo otulutsa mpweya omwe amathandizira ma laser a semiconductor wamba, komanso ali ndi kapangidwe kosinthasintha ka semiconductor bandgap komanso mawonekedwe apamwamba a zinthu. Amatha kuwoneka m'njira zosiyanasiyana zogwiritsira ntchito, monga phokoso lotsika.laser yopapatiza yokhala ndi mzere wopapatizakutulutsa, kupanga ma pulse obwerezabwereza kwambiri, kupanga ma harmonic apamwamba, ndi ukadaulo wa nyenyezi zotsogolera za sodium, ndi zina zotero. Chifukwa cha kupita patsogolo kwa ukadaulo, zofunikira zapamwamba zaperekedwa patsogolo kuti ma wavelength ake azitha kusinthasintha. Mwachitsanzo, magwero a kuwala ogwirizana a dual-wavelength awonetsa kufunika kwakukulu kogwiritsidwa ntchito m'magawo atsopano monga anti-interference lidar, holographic interferometry, wavelength division multiplexing communication, mid-infrared kapena terahertz generation, ndi multi-color optical frequency combs. Momwe mungakwaniritsire kuwala kwa dual-color emission mu semiconductor disc lasers ndikuletsa bwino mpikisano pakati pa ma wavelengths ambiri nthawi zonse kwakhala vuto lofufuza m'munda uno.

Posachedwapa, mtundu wa mitundu iwirilaser ya semiconductorGulu la akatswiri ku China lapereka lingaliro la kapangidwe katsopano ka chip kuti athetse vutoli. Kudzera mu kafukufuku wozama wa manambala, adapeza kuti kuwongolera bwino kutentha kwa quantum well gain filtering ndi semiconductor microcavity filtering effects kuyembekezeka kukwaniritsa kusinthasintha kwa dual-color gain. Kutengera izi, gululo lidapanga bwino 960/1000 nm high-brightness gain chip. Laser iyi imagwira ntchito mu fundamental mode pafupi ndi malire a diffraction, ndi kuwala kotulutsa kokwera kufika pa 310 MW/cm²sr.

Gain layer ya semiconductor disc ndi yokhuthala pang'ono chabe, ndipo Fabry-Perot microcavity imapangidwa pakati pa semiconductor-air interface ndi Bragg reflector yomwe ili pansi. Kusamalira semiconductor microcavity ngati spectral filter yomangidwa mkati mwa chip kudzasintha gain ya quantum well. Pakadali pano, microcavity filtering effect ndi semiconductor gain zimakhala ndi mitundu yosiyanasiyana ya kutentha. Kuphatikiza ndi temperature control, kusintha ndi kulamulira mafunde otuluka kumatha kuchitika. Kutengera ndi makhalidwe awa, gululi linawerengera ndikuyika gain peak ya quantum well pa 950 nm pa temperature ya 300 K, ndi temperature drift rate ya gain wavelength kukhala pafupifupi 0.37 nm/K. Pambuyo pake, gululi linapanga longitudinal constriction factor ya chip pogwiritsa ntchito njira ya transmission matrix, yokhala ndi mafunde okulirapo pafupifupi 960 nm ndi 1000 nm motsatana. Ma simulations adavumbulutsa kuti temperature drift rate inali 0.08 nm/K yokha. Pogwiritsa ntchito ukadaulo wa metal-organic chemical vapor deposition kuti ikule bwino komanso kuti ipititse patsogolo njira yokulira, ma gain chips apamwamba kwambiri adapangidwa bwino. Zotsatira za muyeso wa photoluminescence zimagwirizana kwathunthu ndi zotsatira za simulation. Kuti achepetse kutentha ndikupeza mphamvu zambiri, njira yopangira ma semiconductor-diamond chips yapangidwanso.

Pambuyo pomaliza kulongedza ma chip, gululo linachita kafukufuku wathunthu wa momwe laser imagwirira ntchito. Mu njira yogwirira ntchito mosalekeza, powongolera mphamvu ya pampu kapena kutentha kwa sinki yotenthetsera, kutalika kwa mphamvu yotulutsa kumatha kusinthidwa mosavuta pakati pa 960 nm ndi 1000 nm. Mphamvu ya pampu ikafika pamlingo winawake, laser imathanso kugwira ntchito ya mafunde awiri, ndi kutalika kwa mafunde mpaka 39.4 nm. Pakadali pano, mphamvu yayikulu ya mafunde osalekeza imafika 3.8 W. Pakadali pano, laser imagwira ntchito mu njira yoyambira pafupi ndi malire a diffraction, yokhala ndi beam quality factor M² ya 1.1 yokha komanso kuwala kokwera kufika pafupifupi 310 MW/cm²sr. Gululo linachitanso kafukufuku pa momwe mafunde osalekeza amagwirira ntchito.laserChizindikiro cha kuchuluka kwa ma frequency chinawonedwa bwino poika kristalo ya LiB₃O₅ yopanda mzere mu resonant cavity, kutsimikizira kulumikizana kwa ma wavelength awiri.

Kudzera mu kapangidwe kabwino ka chip, kuphatikiza kwachilengedwe kwa quantum well gain filtering ndi microcavity filtering kwachitika, ndikuyika maziko opangidwira kuti magwero a laser amitundu iwiri apezeke. Ponena za zizindikiro za magwiridwe antchito, laser yamitundu iwiri iyi ya single-chip imapeza kuwala kwakukulu, kusinthasintha kwakukulu komanso kutulutsa kolondola kwa coaxial beam. Kuwala kwake kuli pamlingo wotsogola padziko lonse lapansi m'munda wamakono wa single-chip dual-color semiconductor lasers. Ponena za kugwiritsidwa ntchito kothandiza, kupambana kumeneku kukuyembekezeka kukulitsa bwino kulondola kozindikira komanso kuthekera koletsa kusokonezedwa kwa multi-color lidar m'malo ovuta pogwiritsa ntchito kuwala kwake kwakukulu ndi mawonekedwe amitundu iwiri. Mu gawo la optical frequency combs, kutulutsa kwake kokhazikika kwa dual-wavelength kungapereke chithandizo chofunikira pakugwiritsa ntchito monga muyeso wolondola wa spectral ndi kuzindikira kwapamwamba kwa optical.