Kafukufuku waposachedwa pa ma laser amitundu iwiri a semiconductor

Kafukufuku waposachedwa pa ma laser amitundu iwiri a semiconductor

Ma semiconductor disc lasers (SDL lasers), omwe amadziwikanso kuti vertical external cavity surface-emitting lasers (VECSEL), akopa chidwi kwambiri m'zaka zaposachedwa. Imaphatikiza ubwino wa semiconductor phindu ndi olimba-state resonator. Sizimangochepetsa kuchepetsa kuchepetsa kutulutsa kwamtundu umodzi wothandizira ma semiconductor lasers wamba, komanso zimakhala ndi mawonekedwe osinthika a semiconductor bandgap ndi mawonekedwe apamwamba azinthu. Zitha kuwoneka muzochitika zosiyanasiyana zogwiritsira ntchito, monga phokoso lochepayopapatiza-linewidth laserkutulutsa, ultra-short high-repetition pulse generation, high-order harmonic generation, ndi sodium guide star teknoloji, ndi zina zotero. Mwachitsanzo, kuwala kwapawiri-wavelength kogwirizana kwawonetsa kufunika kogwiritsa ntchito kwambiri m'magawo omwe akubwera monga anti-interference lidar, holographic interferometry, wavelength division multiplexing communication, mid-infrared kapena terahertz generation, ndi multicolor optical frequency zisa. Momwe mungakwaniritsire kuwala kwamitundu iwiri mu semiconductor disc lasers ndikupondereza bwino mpikisano pakati pa mafunde angapo nthawi zonse kwakhala kovuta pakufufuza pankhaniyi.

Posachedwapa, wapawiri-mtundulaser semiconductorgulu ku China lakonza kamangidwe ka chip kuti athane ndi vutoli. Kupyolera mu kafukufuku wozama wa manambala, adapeza kuti kuwongolera bwino kuchuluka kwa kutentha komwe kumakhudzana ndi kutentha kumapeza kusefa komanso kusefa kwa semiconductor microcavity kumayembekezereka kukwaniritsa kuwongolera kupindula kwamitundu iwiri. Kutengera izi, gululi lidapanga bwino chipangizo cha 960/1000 nm chowala kwambiri. Laser iyi imagwira ntchito mofunikira kwambiri pafupi ndi malire a diffraction, ndi kuwala kotulutsa mpaka pafupifupi 310 MW/cm²sr.

Kupeza wosanjikiza wa semiconductor chimbale ndi ochepa micrometers wandiweyani, ndi Fabry-Perot microcavity aumbike pakati pa semiconductor-mpweya mawonekedwe ndi pansi anagawira Bragg wonyezimira. Kuchiza semiconductor microcavity monga cholumikizira chowonekera cha chip chidzasinthira kupindula kwa quantum bwino. Pakadali pano, kusefa kwa microcavity ndi kupindula kwa semiconductor kumakhala ndi kutentha kosiyanasiyana. Kuphatikizidwa ndi kuwongolera kutentha, kusintha ndi kuwongolera kwa mafunde ang'onoang'ono kumatha kukwaniritsidwa. Kutengera mawonekedwe awa, gululo linawerengera ndikuyika chiwongolero cha kuchuluka kwa kuchuluka kwa 950 nm pa kutentha kwa 300 K, ndi kutentha kwamphamvu kwa kuchuluka kwa mafunde kukhala pafupifupi 0.37 nm/K. Pambuyo pake, gululo linapanga chopinga chotalikirapo cha chip pogwiritsa ntchito njira yopatsira matrix, yokhala ndi mafunde apamwamba pafupifupi 960 nm ndi 1000 nm motsatana. Zoyerekeza zidawonetsa kuti kutentha kwanyengo kunali 0.08 nm/K kokha. Pogwiritsa ntchito ukadaulo wachitsulo-organic chemical deposition vapor kukula kwa epitaxial ndikuwongolera mosalekeza kukula, tchipisi tapamwamba kwambiri zidapangidwa bwino. Zotsatira za kuyeza kwa photoluminescence zimagwirizana kwathunthu ndi zotsatira zofananira. Kuti muchepetse kuchuluka kwamafuta ndikukwaniritsa kufalikira kwamphamvu kwambiri, njira yopangira ma semiconductor-diamond chip yapangidwanso.

Pambuyo pomaliza kuyika chip, gululo lidawunika mwatsatanetsatane momwe laser imagwirira ntchito. Munthawi yogwira ntchito mosalekeza, polamulira mphamvu ya mpope kapena kutentha kwakuya kwa kutentha, kutalika kwa utsi kumatha kusinthidwa mosavuta pakati pa 960 nm ndi 1000 nm. Pamene mphamvu ya mpope ili mkati mwamtundu wina, laser imathanso kugwira ntchito yapawiri-wavelength, ndi kutalika kwa kutalika kwa 39.4 nm. Panthawiyi, mphamvu yowonjezereka yopitirirabe imafika pa 3.8 W. Panthawiyi, laser imagwira ntchito mofunikira pafupi ndi malire a diffraction, ndi mtengo wamtengo wapatali wa M² wa 1.1 yekha ndi kuwala kokwanira pafupifupi 310 MW / cm²sr. Gululi lidachitanso kafukufuku wokhudzana ndi momwe mafunde amagwirira ntchitolaser. Chidziwitso chafupipafupi chimawonedwa bwino ndikuyika LiB₃O₅ nonlinear optical crystal mumtsempha wa resonant, kutsimikizira kulumikizana kwa mafunde apawiri.

Kupyolera mu kamangidwe ka chip kanzeru kameneka, kuphatikiza kwachilengedwe kwa kusefa kwa quantum bwino ndi kusefa kwa microcavity kwakwaniritsidwa, kuyika maziko opangira kukwaniritsidwa kwa magwero amitundu iwiri ya laser. Pankhani ya zizindikiro zogwirira ntchito, laser single-chip dual-color laser imakwaniritsa kuwala kwambiri, kusinthasintha kwakukulu komanso kutulutsa kolondola kwa mtengo wa coaxial. Kuwala kwake kuli pamlingo wotsogola wapadziko lonse lapansi pantchito yamakono ya single-chip dual-color semiconductor lasers. Ponena za ntchito yothandiza, kupindula kumeneku kukuyembekezeka kupititsa patsogolo kulondola kwa kuzindikira ndi kutsutsa kusokoneza mphamvu ya lidar yamitundu yambiri m'madera ovuta pogwiritsira ntchito kuwala kwake kwakukulu ndi maonekedwe a mitundu iwiri. M'munda wa ma combs owoneka bwino, kutulutsa kwake kokhazikika kwapawiri-wavelength kumatha kupereka chithandizo chofunikira pazogwiritsa ntchito monga kuyeza kolondola kwa spectral ndi kuzindikira kwapamwamba kwambiri.