Ihe ịga nke ọma! Laser eriri femtosekọnd nke nwere ike kachasị elu n'ụwa nke 3 μm

Mmezu! Ike kachasị elu n'ụwa 3 μm etiti infraredFemtosecond eriri laser

Eriri laserIji nweta mmepụta laser etiti-infrared, nzọụkwụ mbụ bụ ịhọrọ ihe eriri matrix kwesịrị ekwesị. Na laser eriri nso-infrared, quartz glass matrix bụ ihe eriri matrix kachasị ewu ewu nwere obere mfu nnyefe, ike igwe a pụrụ ịdabere na ya na nkwụsi ike dị mma. Agbanyeghị, n'ihi ike phonon dị elu (1150 cm-1), enweghị ike iji eriri quartz maka nnyefe laser etiti-infrared. Iji nweta obere mfu nnyefe nke laser etiti-infrared, anyị kwesịrị ịhọrọ ihe eriri matrix ndị ọzọ nwere obere ike phonon, dị ka matrix iko sulfide ma ọ bụ matrix iko fluoride. Eriri sulfide nwere ike phonon kacha ala (ihe dị ka 350 cm-1), mana ọ nwere nsogbu na enweghị ike ịbawanye njupụta doping, yabụ ọ dabara adaba maka iji ya dị ka eriri gain iji mepụta laser etiti-infrared. Ọ bụ ezie na ihe mkpuchi iko fluoride nwere ike phonon dị elu karịa (550 cm-1) karịa ihe mkpuchi iko sulfide, ọ nwekwara ike nweta obere nnyefe maka laser infrared etiti nwere ogologo ebili mmiri na-erughị 4 μm. Ihe kachasị mkpa bụ na ihe mkpuchi iko fluoride nwere ike nweta nnukwu ntinye doping ụwa dị ụkọ, nke nwere ike inye uru achọrọ maka mmepụta laser etiti infrared, dịka ọmụmaatụ, eriri fluoride ZBLAN kachasị etozu maka Er3+ enwewo ike iru ntinye doping nke ruru 10 mol. Ya mere, matrix iko fluoride bụ ihe kacha mma maka eriri fiber laser etiti infrared.

N'oge na-adịbeghị anya, ndị otu Prọfesọ Ruan Shuangchen na Prọfesọ Guo Chunyu na Mahadum Shenzhen mepụtara femtosekọnd dị ike nke ukwuueriri obi lasernke nwere oscillator eriri Er:ZBLAN nke nwere ụdị 2.8μm, otu ụdị Er:ZBLAN eriri preamplifier na mpaghara ụdị nnukwu Er:ZBLAN eriri amplifier.
Dabere na echiche mkpakọ onwe onye na mmụba nke mkpụkọ etiti infrared ultra-short pulse nke steeti polarization na ọrụ ngụkọ ọnụọgụ nke otu nyocha anyị, yana usoro mgbochi na-abụghị ahịrị na njikwa ụdị nke eriri optical buru ibu, teknụzụ oyi na-arụ ọrụ na nhazi mmụba nke mgbapụta okpukpu abụọ, sistemụ ahụ na-enweta mmepụta pulse ultra-short 2.8μm yana ike nkezi nke 8.12W na obosara pulse nke 148 fs. E megharịrị ndekọ mba ụwa nke ike kachasị elu nke otu nyocha a nwetara.

Foto nke 1. Eserese nhazi nke Er:ZBLAN fiber laser dabere na nhazi MOPA.
Nhazi nkelaser femtosekọndA na-egosi usoro ahụ na Foto 1. E jiri eriri Er:ZBLAN nke nwere otu ụdị nke nwere okpukpu abụọ nke dị mita 3.1 n'ogologo dị ka eriri gain na preamplifier yana mkpokọta doping nke 7 mol.% na dayameta isi nke 15 μm (NA = 0.12). Na isi amplifier, e jiri eriri ụdị nke nwere okpukpu abụọ nke nwere eriri Er:ZBLAN nke nwere ogologo mita 4 dị ka eriri gain nke nwere mkpokọta doping nke 6 mol.% na dayameta isi nke 30 μm (NA = 0.12). Dayameta isi nke buru ibu na-eme ka eriri gain nwee obere ihe na-abụghị ahịrị ma nwee ike iguzogide ike kacha elu na mmepụta pulse nke ike pulse buru ibu. A na-ejikọta nsọtụ abụọ nke eriri gain na okpu njedebe AlF3.