Kodi laser cryogenic ndi chiyani

Lingaliro la lasers lomwe likugwira ntchito pa kutentha kochepa si lachilendo: laser yachiwiri m'mbiri inali cryogenic. Poyambirira, lingaliroli linali lovuta kukwaniritsa ntchito ya kutentha kwa chipinda, ndipo chidwi cha ntchito yotsika kutentha chinayamba m'ma 1990 ndi chitukuko cha lasers ndi amplifiers apamwamba.

Mu mphamvu zapamwambamagwero a laser, zotsatira za kutentha monga kutayika kwa depolarization, lens yotentha kapena kupindika kwa laser crystal kungakhudze magwiridwe antchito.gwero lowala. Kupyolera mu kuziziritsa kwa kutentha kochepa, zowononga zambiri zowononga zimatha kuponderezedwa bwino, ndiye kuti, sing'anga yopindula iyenera kukhazikika mpaka 77K kapena 4K. Kuzizira kumaphatikizapo:

Makhalidwe abwino a sing'anga yopindula amaletsedwa kwambiri, makamaka chifukwa chakuti njira yaulere ya chingwe ikuwonjezeka. Zotsatira zake, kutentha kumatsika kwambiri. Mwachitsanzo, kutentha kumatsika kuchokera ku 300K kufika ku 77K, kutentha kwa kristalo ya YAG kumawonjezeka ndi zisanu ndi ziwiri.

Thermal diffusion coefficient imachepetsanso kwambiri. Izi, pamodzi ndi kuchepetsa kutentha kwa kutentha, kumabweretsa kuchepa kwa kutentha kwa lensing ndipo motero kuchepetsa mwayi wa kupsinjika maganizo.

Thermo-optical coefficient imachepetsedwanso, kumachepetsanso mphamvu ya lens yotentha.

Kuwonjezeka kwa mayamwidwe pamtanda wa ayoni osowa padziko lapansi makamaka chifukwa cha kuchepa kwa kufalikira komwe kumachitika chifukwa cha kutentha. Chifukwa chake, mphamvu ya machulukitsidwe imachepetsedwa ndipo kupindula kwa laser kumawonjezeka. Chifukwa chake, mphamvu ya mpope yocheperako imachepetsedwa, ndipo ma pulse amfupi amatha kupezeka pomwe Q switch ikugwira ntchito. Ndi kuonjezera transmittance wa linanena bungwe coupler, otsetsereka dzuwa akhoza bwino, kotero parasitic patsekeke imfa zotsatira zimakhala zochepa.

Chiwerengero cha tinthu tating'onoting'ono ta gawo la magawo atatu a magawo atatu amachepetsedwa, motero mphamvu yopopa pakhomo imachepetsedwa ndipo mphamvu yamagetsi imapangidwa bwino. Mwachitsanzo, Yb: YAG, yomwe imapanga kuwala pa 1030nm, ikhoza kuwonedwa ngati njira ya quasi-tatu-level pa kutentha kwa firiji, koma dongosolo la magawo anayi pa 77K. Er: N'chimodzimodzinso ndi YAG.

Kutengera ndi njira yopezera, kuchuluka kwa njira zozimitsa kumachepetsedwa.

Kuphatikizidwa ndi zinthu zomwe tazitchula pamwambapa, ntchito yotsika kutentha imatha kusintha kwambiri magwiridwe antchito a laser. Makamaka, ma lasers oziziritsa kutentha otsika amatha kupeza mphamvu zambiri zotulutsa popanda matenthedwe, ndiye kuti, mtengo wabwino ukhoza kupezeka.

Nkhani imodzi yoti muganizire ndi yakuti mu cryocooled laser crystal, bandwidth ya kuwala kowala ndi kuwala koyamwa kudzachepetsedwa, kotero kuti kusinthasintha kwa mafunde kumakhala kocheperapo, ndipo m'lifupi mwake ndi kukhazikika kwa mafunde a laser pumped kudzakhala kovuta kwambiri. . Komabe, izi zimachitika kawirikawiri.

Kuziziritsa kwa Cryogenic nthawi zambiri kumagwiritsa ntchito choziziritsa kukhosi, monga nayitrogeni wamadzimadzi kapena helium yamadzimadzi, ndipo m'malo mwake, firiji imazungulira mu chubu chomwe chimalumikizidwa ndi kristalo wa laser. Zoziziritsa kuziziritsa zimadzadzidwanso pakapita nthawi kapena kubwezerezedwanso mu lupu lotsekeka. Pofuna kupewa kulimba, nthawi zambiri ndikofunikira kuyika kristalo wa laser m'chipinda cha vacuum.

Lingaliro la makristasi a laser omwe amagwira ntchito kutentha pang'ono angagwiritsidwenso ntchito pa amplifiers. Titaniyamu safiro atha kugwiritsidwa ntchito kupanga mayankho abwino amplifier, pafupifupi mphamvu linanena bungwe makumi watts.

Ngakhale zida zoziziritsa za cryogenic zimatha kusokonezamachitidwe a laser, machitidwe oziziritsa omwe amapezeka nthawi zambiri sakhala ophweka, ndipo kuzizira kwa cryogenic kumathandiza kuchepetsa zovuta.