Ho:YAG — Macnaha Waxtarka Leh ee Lagu Abuuro 2.1-μm Laser Emission
Sharaxaada Alaabta
Laser thermokeratoplasty (LTK) ayaa si degdeg ah u horumaray sanadihii ugu dambeeyay. Mabda'a aasaasiga ah waa in la isticmaalo saameynta photothermal ee laser si loo sameeyo fiilooyinka kolajka ee ku wareegsan cornea oo yaraada iyo qalooca dhexe ee cornea waxay noqdaan kurtosis, si loo gaaro ujeedada hagaajinta hyperopia iyo hyperopic astigmatism. Laser Holmium (Ho: YAG laser) waxaa loo arkaa inuu yahay aalad ku habboon LTK. Dhererka hirarka Ho: YAG laser waa 2.06μm, kaas oo iska leh leysarka dhexe-infrared. Waxaa si wax ku ool ah u nuugi kara unugyada lafaha, iyo qoyaanka corneal waa la kululayn karaa oo fiilooyinka kolajka waa la dhimi karaa. xinjirowga dhiigga ka dib, dhexroorka aagga xinjirowga dhiigga ee korkiisa wuxuu ku saabsan yahay 700μm, qoto dheeruna waa 450μm, taas oo masaafo ammaan ah u jirta endothelium corneal. Tan iyo markii Seiler et al. (1990) markii ugu horeysay waxay codsadeen Ho: YAG laser iyo LTK ee daraasadaha kiliinikada, Thompson, Durrie, Alio, Koch, Gezer iyo kuwa kale ayaa si isdaba joog ah u sheegay natiijooyinkooda cilmi-baarista. Ho:YAG laser LTK waxa loo isticmaalay hawl maalmeedka caafimaadka. Hababka la midka ah ee lagu saxo hyperopia waxaa ka mid ah keratoplasty radial iyo eximer laser PRK. Marka la barbar dhigo radial keratoplasty, Ho:YAG waxay u muuqataa inay sii saadaalisay LTK oo uma baahna gelinta baadhista xudunta mana keenayso necrosis nudaha corneal ee aagga heerkulbeegyada. Excimer laser hyperopic PRK waxay ka tagtaa kaliya dhexda dhexe ee 2-3mm iyada oo aan la tirtirin, taas oo u horseedi karta indho la'aan iyo iftiin habeenkii ah marka loo eego Ho: YAG LTK waxay ka tagtaa qiyaasta dhexe ee corneal ee 5-6mm. kiristaalo ayaa soo bandhigay 14 kanaal laser kala duwan, oo ku shaqeynaya qaabab ku meel gaar ah laga bilaabo CW ilaa qaab quful. Ho:YAG waxaa caadi ahaan loo isticmaalaa si hufan si loo dhaliyo 2.1-μm laser ka gudubka 5I7- 5I8, codsiyada sida laser fog dareenka, qaliinka caafimaadka, iyo bamgareynta Mid-IR OPO si loo gaaro 3-5micron qiiqa. Nidaamyada bamgareynta tooska ah ee diode-ka iyo Tm: Nidaamyada bamgareynta Fiber Laser[4] waxay muujiyeen wax-ku-oolnimo sare, qaar ayaa soo dhowaanaya xadka aragtida.
Guryaha aasaasiga ah
| Ho3+ kala duwanaansho | 0.005 - 100 atomiga % |
| Dhererka mawjadaha sii daaya | 2.01 um |
| Kala-guurka Laser | 5I7 → 5I8 |
| Flouresence Nolosha | 8.5 ms |
| Dhererka mawjadaha bamka | 1.9 um |
| Isku-dhafka Balaadhinta kulaylka | 6.14 x 10-6 K-1 |
| Kala-baxa kulaylka | 0.041 cm2 s-2 |
| Habdhaqanka kulaylka | 11.2 W m-1 K-1 |
| Kuleylka Gaarka ah (Cp) | 0.59 J g-1 K-1 |
| Iska caabinta shoogga kulaylka | 800 W m-1 |
| Tusmada dib-u-celinta @ 632.8 nm | 1.83 |
| dn/dT (Iskuxidhka kulaylka ee Tusmada Refractive) @ 1064nm | 7.8 10-6 K-1 |
| Miisaanka Molecular | 593.7 g mol-1 |
| Meesha dhalaalaysa | 1965℃ |
| Cufnaanta | 4.56 g cm-3 |
| MOHS Adag | 8.25 |
| Modulka dhalinyarada | 335 GB |
| Xoogga Jilicsan | 2 Gpa |
| Dhismaha Crystal | Kuub |
| Hanuuninta caadiga ah | |
| Y3+ astaanta goobta | D2 |
| Lattice Constant | a=12.013 Å |
