Ho:YAG - Mokhoa o Sebetsang oa ho Hlahisa Phallo ea Laser ea 2.1-μm
Tlhaloso ea Sehlahisoa
Laser thermokeratoplasty (LTK) e tsoetse pele ka potlako lilemong tsa morao tjena. Molao-motheo oa motheo ke ho sebelisa phello ea photothermal ea laser ho etsa hore likhoele tsa collagen tse pota-potileng cornea li fokotsehe 'me karolo e bohareng ea cornea e be kurtosis, e le ho finyella sepheo sa ho lokisa hyperopia le hyperopic astigmatism. Laser ea Holmium (Ho: YAG laser) e nkoa e le sesebelisoa se loketseng bakeng sa LTK. Bophahamo ba laser ea Ho:YAG ke 2.06μm, eo e leng ea leseare ea bohareng ba infrared. E ka kenngoa ka katleho ke lisele tsa cornea, 'me mongobo oa cornea o ka futhumatsoa' me likhoele tsa collagen li ka fokotseha. Ka mor'a photocoagulation, bophara ba corneal surface coagulation zone ke hoo e ka bang 700μm, 'me botebo ke 450μm, e leng sebaka se sireletsehileng ho tloha ho corneal endothelium. Ho tloha ha Seiler et al. (1990) e qalile ho sebelisa laser ea Ho:YAG le LTK lithutong tsa bongaka, Thompson, Durrie, Alio, Koch, Gezer le ba bang ka ho latellana ba tlaleha liphetho tsa bona tsa lipatlisiso. Ho:YAG laser LTK e sebelisitsoe mesebetsing ea bongaka. Mekhoa e ts'oanang ea ho lokisa hyperopia e kenyelletsa radial keratoplasty le excimer laser PRK. Ha ho bapisoa le radial keratoplasty, Ho: YAG e bonahala e le e bolelang esale pele ea LTK 'me ha e hloke ho kenngoa ha probe ka har'a cornea' me ha e bake corneal tissue necrosis sebakeng sa thermocoagulation. Excimer laser hyperopic PRK e siea feela karolo e bohareng ea corneal ea 2-3mm ntle le ablation, e ka lebisang ho foufetseng le ho benya ha bosiu ho feta Ho: YAG LTK e siea mefuta e bohareng ea corneal ea 5-6mm.Ho:YAG Ho3+ ion doped into insulating laser likristale li bonts'itse likanale tse 14 tse fapaneng tsa laser, tse sebetsang ka mekhoa ea nakoana ho tloha ho CW ho isa ho e notletsoeng. Ho:YAG hangata e sebelisoa e le mokhoa o sebetsang oa ho hlahisa 2.1-μm laser emission ho tloha phetohong ea 5I7- 5I8, bakeng sa lits'ebetso tse kang laser remote sensing, opereishene ea bongaka, le ho pompa Mid-IR OPO's ho fihlela tlhahiso ea 3-5micron. Litsamaiso tse pompetsoeng tsa diode tse otlolohileng le Tm: Lits'ebetso tse pompetsoeng tsa Fiber Laser [4] li bonts'itse katleho ea hi slope, tse ling li atamela moeli oa thuto.
Thepa ea Motheo
| Ho3+ concentration range | 0.005 - 100 atomic% |
| Emission Wavelength | 2.01 um |
| Phetoho ea Laser | 5I7 → 5I8 |
| Flouresence Bophelong bohle | 8.5 ms |
| Pompo Wavelength | 1.9 hle |
| Coefficient ea Katoloso ea Thermal | 6.14 x 10-6 K-1 |
| Thermal Diffusivity | 0.041 cm2 s-2 |
| Thermal Conductivity | 11.2 W m-1 K-1 |
| Mocheso o khethehileng (Cp) | 0,59 J g-1 K-1 |
| Thermal Shock Resistant | 800 W m-1 |
| Refractive Index @ 632.8 nm | 1.83 |
| dn/dT (Thermal Coefficient of Refractive Index) @ 1064nm | 7.8 10-6 K-1 |
| Boima ba Molek'hule | 593,7 dikgerama mol-1 |
| Melting Point | 1965 ℃ |
| Botenya | 4.56 g cm-3 |
| MOHS boima | 8.25 |
| Modulus ea Bacha | 335 GPA |
| Matla a tšepe | 2Gpa |
| Sebopeho sa Crystal | Likhubu |
| Mokhoa o Tloaelehileng | |
| Y3+ Site Symmetry | D2 |
| Lattice Constant | a=12.013 Å |
