Kedu ihe bụ laser cryogenic

Echiche nke lasers na-arụ ọrụ na obere okpomọkụ abụghị ihe ọhụrụ: laser nke abụọ na akụkọ ihe mere eme bụ cryogenic. Na mbụ, echiche ahụ siri ike iji nweta ọrụ okpomọkụ nke ụlọ, na ịnụ ọkụ n'obi maka ọrụ obere okpomọkụ malitere na 1990 site na ịmepụta lasers na amplifiers dị elu.

Na ike dị eluisi mmalite laser, mmetụta thermal dị ka depolarization ọnwụ, thermal lens ma ọ bụ laser kristal ekwe nwere ike imetụta arụmọrụ nkeìhè isi iyi. Site na nju oyi dị ala, enwere ike ịkwụsị ọtụtụ mmetụta thermal na-emerụ ahụ nke ọma, ya bụ, a ga-eme ka ọ dị mma na 77K ma ọ bụ ọbụna 4K. Mmetụta jụrụ oyi gụnyere:

A na-egbochi àgwà conductivity nke uru usoro nke ukwuu, tumadi n'ihi na pụtara free ụzọ nke eriri na-abawanye. N'ihi ya, gradient okpomọkụ na-ada nke ukwuu. Dịka ọmụmaatụ, mgbe a na-ebelata okpomọkụ site na 300K ruo 77K, okpomọkụ nke kristal YAG na-abawanye site na ihe nke asaa.

Ọnụọgụ mgbasa nke thermal na-agbadakwa nke ọma. Nke a, yana mbelata nke gradient okpomọkụ, na-ebute mbelata mmetụta lensing thermal na ya mere mbelata ohere nke mgbawa nrụgide.

A na-ebelatakwa ọnụọgụ nke thermo-optical, na-ebelata mmetụta lens thermal.

Mmụba nke absorption cross section nke obere ụwa ion bụ n'ihi mbelata nke mgbasawanye nke mmetụta thermal kpatara. Ya mere, ike saturation na-ebelata ma nweta laser na-abawanye. Ya mere, a na-ebelata ike mgbapụta ọnụ ụzọ, enwere ike nweta obere mkpirisi mgbe mgba ọkụ Q na-arụ ọrụ. Site n'ịbawanye nnyefe nke mmepụta ihe mmepụta ihe, enwere ike imeziwanye arụmọrụ mkpọda, ya mere mmetụta ọnwụ nke oghere parasitic na-aghọ ihe na-adịchaghị mkpa.

Ọnụ ọgụgụ urughuru nke ngụkọta ala dị ala nke quasi-ọkwa atọ nke uru na-enweta na-ebelata, ya mere a na-ebelata ike ịgbapụta ọnụ ụzọ ma na-emeziwanye ike ike. Dịka ọmụmaatụ, Yb: YAG, nke na-emepụta ìhè na 1030nm, enwere ike ịhụ ya dị ka usoro nhazi ọkwa atọ na ụlọ okpomọkụ, mana usoro ọkwa anọ na 77K. Er: Otu ahụ ka ọ dịkwa YAG.

Dabere na usoro uru, a ga-ebelata ike nke ụfọdụ usoro ịmenyụ ọkụ.

Ejikọtara ya na ihe ndị dị n'elu, ọrụ okpomọkụ dị ala nwere ike ime ka ọrụ nke laser dịkwuo mma. Karịsịa, lasers jụrụ oyi dị ala nwere ike nweta ike mmepụta dị elu na-enweghị mmetụta ọkụ, ya bụ, enwere ike nweta ezigbo ọkụ ọkụ.

Otu okwu ị ga-atụle bụ na n'ime kristal laser cryocooled, bandwit nke ìhè na-egbuke egbuke na ọkụ na-etinye uche ga-ebelata, ya mere ngbanwe ngbanwe nke ogologo ogologo ga-adị warara, na obosara ahịrị na nkwụsi ike nke laser a na-agbapụta ga-adịkwu ike karị. . Otú ọ dị, mmetụta a na-adịkarị ụkọ.

Cryogenic jụrụ oyi na-ejikarị ihe jụrụ oyi, dị ka nitrogen mmiri mmiri ma ọ bụ helium mmiri mmiri, ma ọ dị mma, refrigerant na-ekesa site na tube nke etinyere na kristal laser. A na-ejuju oyi n'oge ma ọ bụ megharịa ya na akaghị emechi. Iji zere iguzosi ike, ọ na-adịkarị mkpa itinye kristal laser n'ime oghere oghere.

A pụkwara itinye echiche nke kristal laser na-arụ ọrụ na obere okpomọkụ na amplifiers. Enwere ike iji titanium sapphire mee nzaghachi nzaghachi dị mma, nkezi mmepụta ike na iri puku watts.

Ọ bụ ezie na ngwaọrụ jụrụ oyi nke cryogenic nwere ike gbakọọusoro laser, usoro jụrụ oyi na-adịkarị mfe na-adịkarị mfe, na arụmọrụ nke cryogenic jụrụ oyi na-enye ohere maka mbelata ụfọdụ mgbagwoju anya.