I-laser yeshidi elikhiywe ngemodi, i-laser enamandla amakhulu e-ultrafast

Amandla aphezulu we-femtosecondlaserinenani elikhulu lesicelo ocwaningweni lwesayensi nasezinkambini zezimboni ezifana nokukhiqizwa kwe-terahertz, i-attosecond pulse generation kanye nekama lemvamisa yokubona.Ama-laser akhiyiwengokusekelwe kumidiya yendabuko ye-block-zuza inqunyelwe umphumela we-lensing eshisayo kumandla aphezulu, futhi okwamanje amandla aphezulu okukhiphayo angaba ngu-20 W.

I-laser yeshidi elincanyana isebenzisa ukwakheka kwephampu enamaphasi amaningi ukuze iboniseiphampu ukukhanyaeshidini zuza okuphakathi nogqinsi lwama-microns angu-100 ukuze kufakwe iphampu esebenza kahle kakhulu. Indawo yokuzuza ezacile kakhulu ehlanganiswe nobuchwepheshe be-backcooling inciphisa kakhulu umthelela we-lens eshisayo kanye nomphumela ongaqondile, futhi ingafinyelela amandla aphezulu okukhipha i-femtosecond pulse.
Ama-wafer oscillator ahlanganiswe nobuchwepheshe bokukhiya imodi ye-Kerr lens ayindlela eyinhloko yokuthola ukuphuma kwe-laser yamandla emaphakathi ne-pulse wide ngokulandelana kwe-femtosecond.

I-FIG. 1 (a) 72 umdwebo wesakhiwo esibonakalayo kanye (b) nomdwebo obonakalayo wemojula yephampu

Ithimba labacwaningi abavela ku-Chinese Academy of Sciences laklama futhi lakha i-laser yeshidi elikhiywe ilensi ye-Kerr ngokusekelwe kumojula yephampu yezindlela ezingu-72 ezithuthukisiwe, futhi lenza i-laser yeshidi elikhiywe ilensi ye-Kerr enamandla amaphakathi nesilinganiso esisodwa. i-pulse energy e-China.
Ngokusekelwe kumgomo wokukhiya imodi ye-Kerr lens kanye nokubala okuphindaphindwayo kwe-ABCD matrix, ithimba labacwaningi liqale lahlaziya ithiyori yokukhiya i-mode-locking laser encane ye-Kerr lens mode-locking, lalinganisa izinguquko zemodi kusithombothi ngesikhathi sokukhiya imodi. kanye nokusebenza okuqhubekayo, futhi kwaqinisekisa ukuthi irediyasi yemodi yomgodi ku-diaphragm eqinile izoncishiswa ngaphezu kuka-7% ngemva kokukhiya imodi.

Ngokulandelayo, liqondiswa isimiso sokuklama, ithimba locwaningo laklama futhi lakha i-resonator ekhiyiwe yelensi ye-Kerr (FIG. 2) ngokusekelwe kumojula yepompo yezindlela ezingu-72 (FIG.1) eyakhiwe ngokuzimela iqembu, futhi lathola i-pulsed laser. okukhiphayo ngamandla amaphakathi angu-11.78W, ububanzi be-pulse bungu-245 fs kanye namandla okuthinta okukodwa okungu-0.14μJ ku-72 W ngesikhathi sokupompa. Ububanzi be-pulse ephumayo kanye nokuhluka kwemodi ye-intracavity kuvumelana kahle nemiphumela yokulingisa.

I-FIG. 2 Umdwebo we-schematic we-resonant cavity ye-Kerr lens ekhiyiwe yemodi ye-Yb:YAG wafer laser esetshenziswe ekuhloleni

Ukuze kuthuthukiswe amandla okukhipha e-laser, ithimba locwaningo lenyuse irediyasi yokugoba yesibuko esigxilisa ingqondo, futhi lalungisa kahle ukujiya okuphakathi kwe-Kerr kanye nokuhlakazwa kwe-oda lesibili. Lapho amandla epompo esethelwe ku-94 W, isilinganiso samandla okukhiphayo anyuswa saba ngu-22.33 W, futhi ububanzi be-pulse babungu-394 fs kanye namandla okuthinta okukodwa kwaba ngu-0.28 μJ.

Ukuze kuqhutshekwe nokwandisa amandla okukhipha, ithimba locwaningo lizophinde likhulise i-radius yokugoba yepheya yesibuko se-concave egxilile, kuyilapho libeka i-resonator endaweni evalekile ye-vacuum ephansi ukuze kuncishiswe ithonya lokuphazamiseka komoya nokuhlakazeka komoya.