Sabbin bincike kan lasers na semiconductor masu launuka biyu

Sabbin bincike kan lasers na semiconductor masu launuka biyu

Na'urorin laser na faifan semiconductor (laser SDL), wanda kuma aka sani da na'urorin laser na saman rami na tsaye (VECSEL), sun jawo hankali sosai a cikin 'yan shekarun nan. Yana haɗa fa'idodin samun semiconductor da kuma na'urorin resonator masu ƙarfi. Ba wai kawai yana rage ƙarancin yankin fitarwa na tallafin yanayi ɗaya ga na'urorin laser na semiconductor na gargajiya ba, har ma yana da ƙirar bandeji mai sassauƙa na semiconductor da kuma halayen samun kayan aiki masu yawa. Ana iya ganinsa a cikin yanayi daban-daban na aikace-aikace, kamar ƙarancin hayaniya.Laser mai faɗi mai faɗifitarwa, samar da bugun zuciya mai sauri, samar da harmonic mai girma, da fasahar jagorar sodium, da sauransu. Tare da ci gaban fasaha, an gabatar da buƙatu mafi girma don sassaucin tsawonta. Misali, tushen haske mai haɗin gwiwa na tsawon zango biyu sun nuna ƙimar aikace-aikace mai yawa a fannoni masu tasowa kamar lidar mai hana tsangwama, haɗin gwiwar holographic, sadarwa mai yawa na rabuwar tsawon zango, samar da tsakiyar infrared ko terahertz, da kuma tsefewar mitar gani mai launuka da yawa. Yadda ake cimma fitar da haske mai yawa a cikin lasers na diski na semiconductor da kuma rage gasa tsakanin raƙuman ruwa da yawa koyaushe yana da wahala a bincike a wannan fanni.

Kwanan nan, wani launi mai launuka biyuLaser na semiconductorTawagar da ke aiki a China ta gabatar da wani sabon tsari na ƙira guntu don magance wannan ƙalubalen. Ta hanyar zurfafa bincike kan lambobi, sun gano cewa ana sa ran daidaita tasirin tace rijiyar quantum da tasirin tace microcavity na semiconductor da ke da alaƙa da zafin jiki zai cimma nasarar sarrafa ribar launuka biyu. Dangane da wannan, ƙungiyar ta yi nasarar ƙirƙirar guntu mai ƙarfin haske mai girman 960/1000 nm. Wannan laser yana aiki a yanayin asali kusa da iyakar diffraction, tare da hasken fitarwa har zuwa kusan 310 MW/cm²sr.

Layin riba na faifan semiconductor yana da kauri kaɗan na micrometers, kuma an samar da ƙaramin rami na Fabry-Perot tsakanin hanyar haɗin semiconductor-air da kuma Bragg reflector na ƙasa da aka rarraba. Yin la'akari da ƙaramin rami na semiconductor a matsayin matattarar spectral da aka gina a cikin guntu zai daidaita rijiyar quantum. A halin yanzu, tasirin tace microcavity da ribar semiconductor suna da bambancin saurin juyawar zafin jiki. Idan aka haɗa su da sarrafa zafin jiki, ana iya cimma sauyawa da daidaita tsawon tsayin fitarwa. Dangane da waɗannan halaye, ƙungiyar ta ƙididdige kuma ta saita kololuwar riba na rijiyar quantum a 950 nm a zafin jiki na 300 K, tare da ƙimar juyawar zafin jiki na tsawon tsayin samu shine kusan 0.37 nm/K. Daga baya, ƙungiyar ta tsara ma'aunin ƙuntatawa na tsayin guntu ta amfani da hanyar matrix na watsawa, tare da tsawon tsayin kololuwar kusan 960 nm da 1000 nm bi da bi. Kwaikwayo sun nuna cewa ƙimar juyawar zafin jiki shine kawai 0.08 nm/K. Ta hanyar amfani da fasahar adana tururin sinadarai na ƙarfe da na halitta don ci gaban epitaxial da kuma ci gaba da inganta tsarin girma, an yi nasarar ƙera guntun riba masu inganci. Sakamakon aunawa na hasken rana ya yi daidai da sakamakon kwaikwayo. Don rage nauyin zafi da kuma cimma watsawa mai ƙarfi, an ƙara haɓaka tsarin marufi na guntun semiconductor-lu'u-lu'u.

Bayan kammala marufin guntu, ƙungiyar ta gudanar da cikakken kimanta aikin laser ɗinta. A cikin yanayin aiki mai ci gaba, ta hanyar sarrafa ƙarfin famfo ko zafin wurin nutsewa na zafi, ana iya daidaita tsawon fitar da iskar gas mai sassauƙa tsakanin 960 nm da 1000 nm. Lokacin da ƙarfin famfo yake cikin takamaiman kewayon, laser ɗin kuma zai iya cimma aikin tsawon zango biyu, tare da tazara mai tsawon zango har zuwa 39.4 nm. A wannan lokacin, matsakaicin ƙarfin raƙuman ruwa mai ci gaba ya kai 3.8 W. A halin yanzu, laser ɗin yana aiki a yanayin asali kusa da iyakar diffraction, tare da ƙimar ingancin hasken M² na 1.1 kawai da haske mai girman kusan 310 MW/cm²sr. Ƙungiyar ta kuma gudanar da bincike kan aikin raƙuman ruwa masu kama da juna nalaserAn yi nasarar lura da siginar mitar jimla ta hanyar saka lu'ulu'u mai haske na LiB₃O₅ mara layi a cikin ramin resonant, yana tabbatar da daidaitawar raƙuman ruwa biyu.

Ta hanyar wannan ƙira mai ban mamaki ta guntu, an cimma haɗin halitta na tace rijiyar quantum gain da tace microcavity, wanda hakan ya kafa harsashin ƙira don cimma tushen laser mai launuka biyu. Dangane da alamun aiki, wannan laser mai launuka biyu yana samun babban haske, sassauci mai yawa da kuma ingantaccen fitowar hasken coaxial. Haskensa yana kan gaba a duniya a fannin lasers mai launuka biyu na semiconductor guda ɗaya. Dangane da aikace-aikacen da ake amfani da shi, ana sa ran wannan nasarar za ta inganta daidaiton ganowa da kuma ikon hana tsangwama na lidar mai launuka da yawa a cikin mahalli masu rikitarwa ta hanyar amfani da babban haske da halayen launuka biyu. A fannin tsefewar mitar gani, fitowar sa mai ƙarfi ta raƙuman ruwa biyu na iya samar da tallafi mai mahimmanci ga aikace-aikace kamar ma'aunin haske daidai da kuma jin haske mai haske mai ƙuduri mai girma.