Mwachidule za mapira

Mwachidulemapira a ma lasers

Njira Yotsogola Kwambiri YopangalaserKupindika ndikuwonjezera mwatolator kupita kunja kwa wosewerera. Njira iyi imatha kupanga purse yothamanga kwambiri, ngakhale yosavuta, koma yopanda tanthauzo yopepuka ndi mphamvu ya peak siyingapitirize mphamvu yokhazikika. Chifukwa chake, njira yabwino yopangira laser laser ndikusintha pagalimoto ya laser, kusunga mphamvu pa nthawi yopuma ndikumasulira nthawi. Maluso anayi omwe amagwiritsidwa ntchito potulutsa masitepe a laser amasinthasintha kusinthaku, q-switch (kutaya kusintha), kusala kanthu, ndi kutseka koyenda.

Tsitsi la phindu limapanga mafayilo achidule ndikusintha pampu. Mwachitsanzo, Semicotoctorc osinthika osinthidwa amatha kutulutsa kuchokera ku nanosekonda kupita ku ma picosecondi zana ndi zana. Ngakhale mphamvu zamkati zimakhala zochepa, njirayi ndiyosasinthika kwambiri, monga kupereka pafupipafupi komanso kupindika m'lifupi. Mu 2018, ofufuza ku yunivesite ya Tokyo adanenapo za semicotorockecy sear-squiconduct yosinthidwa, kuyimira kuwononga m'bodzi ya zaka 40.

Amphamvu a nanosecand amapangidwa ndi ma lasers osinthidwa, omwe amatulutsidwa mu maulendo angapo ozungulira mu chapamwamba, ndipo mphamvu zamkati zimakhala m'magulu angapo a milliitali, kutengera kukula kwa dongosolo. Mphamvu yapakatikati (nthawi zambiri m'munsi umodzi 1 μop) Picosecond ndi femtuosecond pulses imapangidwa makamaka ndi ma lasers otsekeka. Pali imodzi kapena zingapo za ultrahort pumps mu laser resonator yomwe imayenda mosalekeza. Iliyonse itavocyovaty imatsitsira zotulutsa kudzera pagalasi yotulutsa, ndipo renquincy nthawi zambiri imakhala pakati pa 10 Mhz ndi 100 ghz. Chiwerengero chomwe chili pansipa chikuwonetsa kufalitsa kwathunthu (and) soiton soiton femtosecondChipangizo cha Laser Laser, ambiri omwe amatha kumangidwa pogwiritsa ntchito zigawo zomangira (fiber, mandala, Phiri la Kusauka ndi Kusauka).

Njira Yopanda Isving Isving ikhoza kugwiritsidwa ntchitoMangalawa osinthidwaKuti mupeze ma pulose ofupikira ndi ma lasers otsekeka kuti muwonjezere mphamvu zowonjezera zokhala ndi mawonekedwe otsika.

Nthawi yopanga ndi pafupipafupi
Ma mzere mawonekedwe a zosenda ndi nthawi nthawi zambiri zimakhala zosavuta ndipo zitha kufotokozedwa ndi Gaussian ndi Sechu. Nthawi ya nthawi (yomwe imadziwikanso ngati mulingo wambiri) imafotokozedwa kwambiri ndi kutalika kwa theka (FWHM) kutalika kwake, ndiko kuti, kutalika komwe mphamvu yam'madzi imakhala theka mphamvu; LOSSET LOST amapanga nanosecond ma pulote mwachidule
Lasers otsekeka amatulutsa ma pulose-afupipafupi (USP) mu dongosolo la makumi a picosecondi kupita ku femptondeconds. Magetsi othamanga kwambiri amatha kungowonjezera makumi a picosecond, ndipo mapiri ofupikitsika amangoyesedwa ndi maluso othamanga okha monga autocorreor, achule ndi kangaude. Pomwe nanosecond kapena mapiri atatali sasintha nthawi yayitali pomwe amayenda, ngakhale atadutsa mtunda wautali, ma pulose-afupipafupi amatha kukhudzidwa ndi zinthu zosiyanasiyana:

Kubalalika kumatha kuyambitsa mphamvu yayikulu, koma atha kubwezeredwanso ndi kupezeka komwe kumachitika. Chithunzi chotsatirachi chikuwonetsa momwe mandimu femtotosecond Compresser amalipirira ma microscope obalalika.

Kusanthula nthawi zambiri sikukhudza mwachindunji kutalika kwamphamvu, koma kumakulitsa gulu la bandwidth, kupangitsa kuti khungu lanu ligwere pofalitsa. Fiber iliyonse, kuphatikizapo zopereka zina zokhala ndi bandwidth, zimatha kukhudza mawonekedwe a bandwidth kapena wafupipafupi, ndipo kuchepa kwa bandwidth kumatha kuyambitsa kukulitsa nthawi; Palinso zochitika zomwe zimakulitsa pulani ya pulani yolima kwambiri imakhala yofupikitsa pomwe mawonekedwe amayamba kuchepera.