Ho: YAG - Ụzọ dị mma iji wepụta 2.1-μm Laser Emission
Nkọwa ngwaahịa
Laser thermokeratoplasty (LTK) amalitela ngwa ngwa n'afọ ndị na-adịbeghị anya. Ụkpụrụ bụ isi bụ iji mmetụta photothermal nke laser na-eme ka eriri collagen dị n'akụkụ cornea na-adaba na curvature etiti nke cornea na-aghọ kurtosis, iji nweta nzube nke imezi hyperopia na hyperopic astigmatism. A na-ewere laser Holmium (Ho: YAG laser) ka ọ bụrụ ezigbo ngwaọrụ maka LTK. Ogologo ogologo nke Ho: YAG laser bụ 2.06μm, nke bụ nke laser infrared etiti. Enwere ike ịmịnye ya nke ọma site na anụ ahụ corneal, na mmiri nke corneal nwere ike ikpo ọkụ na eriri collagen nwere ike ibelata. Mgbe photocoagulation gasịrị, dayameta nke mpaghara coagulation nke corneal dị ihe dị ka 700μm, na omimi bụ 450μm, nke dị nnọọ anya site na endothelium corneal. Ebe ọ bụ na Seiler et al. (1990) buru ụzọ tinye Ho: YAG laser na LTK na ọmụmụ ụlọ ọgwụ, Thompson, Durrie, Alio, Koch, Gezer na ndị ọzọ na-akọpụta nsonaazụ nyocha ha. Ho: YAG laser LTK ka ejirila mee ihe na ụlọ ọgwụ. Ụzọ ndị yiri ya iji dozie hyperopia gụnyere radial keratoplasty na excimer laser PRK. E jiri ya tụnyere radial keratoplasty, Ho: YAG na-egosi na ọ na-ebu amụma banyere LTK na ọ dịghị achọ ntinye nyocha n'ime cornea ma ghara ịkpata necrosis anụ ahụ corneal na mpaghara thermocoagulation. Excimer laser hyperopic PRK na-ahapụ naanị etiti corneal nke 2-3mm na-enweghị ablation, nke nwere ike ime ka kpuo ìsì na ìhè abalị karịa Ho: YAG LTK na-ahapụ etiti corneal nke 5-6mm.Ho: YAG Ho3 + ions doped n'ime laser mkpuchi mkpuchi. kristal egosipụtala ọwa laser inter-manifold 14, na-arụ ọrụ n'ụdị nwa oge site na CW ruo ọnọdụ akpọchiri. Ho: YAG na-ejikarị eme ihe dị ka ụzọ dị mma iji mepụta 2.1-μm laser emission site na 5I7- 5I8 mgbanwe, maka ngwa dị ka laser remote sensing, ọgwụ ịwa ahụ, na pumping Mid-IR OPO's iji nweta 3-5micron emission. Sistemụ mgbapụta diode Direct na Tm: Fiber Laser Pumped Sistemu[4] egosipụtala arụmọrụ mkpọda dị elu, ụfọdụ na-abịaru nso n'usoro usoro.
Njirimara ndị bụ isi
| Oke ịta ahụhụ Ho3+ | 0.005-100 atomic% |
| Ogologo ikuku ikuku | 2.01 nke |
| Ntugharị Laser | 5I7 → 5I8 |
| Oge ndụ Flouresence | 8.5ms |
| Ogologo ogologo mgbapụta | 1,9 nke |
| Ọnụọgụ nke Thermal Mgbasawanye | 6.14 x 10-6 K-1 |
| Diffusivity nke okpomọkụ | 0,041 cm2 s-2 |
| Nrụpụta okpomọkụ | 11.2 W m-1 K-1 |
| Okpomọkụ akọwapụtara (Cp) | 0,59 J g-1 K-1 |
| Thermal Shock Resistant | 800W m-1 |
| Ntụgharị ntụgharị @ 632.8 nm | 1.83 |
| dn/dT (Thermal Coefficient of Ntụgharị ntụgharị) @ 1064nm | 7.8 10-6 K-1 |
| Ibu molekụla | 593,7 g mol-1 |
| Ebe Na-agbaze | 1965 ℃ |
| Njupụta | 4.56 g cm-3 |
| MOHS siri ike | 8.25 |
| Modul nke Young | 335Gpa |
| Ike ọdụdọ | 2 Gpa |
| Ọdịdị kristal | Kubik |
| Usoro nhazi | |
| Y3+ Saịtị Symmetry | D2 |
| Lattice Constant | a=12.013 Å |
