Ho:YAG — Izindlela Eziphumelelayo Zokukhiqiza Ukukhishwa Kwe-Laser okungu-2.1-μm
Incazelo Yomkhiqizo
I-Laser thermokeratoplasty (LTK) ithuthuke ngokushesha eminyakeni yamuva. Umgomo oyisisekelo uwukusebenzisa umphumela we-photothermal we-laser ukwenza imicu ye-collagen ezungeze i-cornea inciphe futhi ukugoba okumaphakathi kwe-cornea kube yi-kurtosis, ukuze kufezwe inhloso yokulungisa i-hyperopia kanye ne-hyperopic astigmatism. I-Holmium laser (Ho:YAG laser) ithathwa njengethuluzi elikahle le-LTK. Ubude begagasi be-laser ye-Ho:YAG bungu-2.06μm, okungele-laser emaphakathi ne-infrared. Ingamuncwa ngokuphumelelayo izicubu ze-cornea, futhi umswakama we-cornea ungashiswa futhi imicu ye-collagen ingancipha. Ngemuva kwe-photocoagulation, ububanzi be-corneal surface coagulation zone cishe bungama-700μm, futhi ukujula kungu-450μm, okuyibanga eliphephile ukusuka ku-corneal endothelium. Kusukela uSeiler et al. (1990) waqala ukusebenzisa i-Ho:YAG laser kanye ne-LTK ezifundweni zomtholampilo, uThompson, Durrie, Alio, Koch, Gezer nabanye babika ngokulandelana imiphumela yabo yocwaningo. I-Ho:YAG laser LTK isetshenziswe ekusebenzeni komtholampilo. Izindlela ezifanayo zokulungisa i-hyperopia zihlanganisa i-radial keratoplasty ne-excimer laser PRK. Uma kuqhathaniswa ne-radial keratoplasty, i-Ho:YAG ibonakala ibikezela kakhulu i-LTK futhi ayidingi ukufakwa kwe-probe ku-cornea futhi ayibangeli i-corneal tissue necrosis endaweni ye-thermocoagulation. I-Excimer laser hyperopic PRK ishiya kuphela ububanzi obumaphakathi be-cornea obungu-2-3mm ngaphandle kokukhishwa, okungase kuholele ekuphuphuthekeni okungaphezulu kanye nokucwebezela kwasebusuku kuno-Ho: YAG LTK ishiya ububanzi obumaphakathi be-corneal obungu-5-6mm.Ho:YAG Ho3+ ion efakwe ku-insulating laser amakristalu abonise amashaneli e-laser ahlukahlukene ayi-14, asebenza ngezindlela zesikhashana ukusuka ku-CW kuya kumodi ekhiyiwe . I-Ho:YAG ivamise ukusetshenziswa njengendlela ephumelelayo yokukhiqiza ukukhishwa kwe-laser okungu-2.1-μm kusukela kuguquko lwe-5I7- 5I8, kwezinhlelo zokusebenza ezifana nokuzwa okukude kwe-laser, ukuhlinzwa kwezokwelapha, nokumpompa i-Mid-IR OPO's ukuze kuzuzwe ukukhishwa kwe-3-5micron. I-Direct diode pumped systems kanye ne-Tm: I-Fiber Laser pumped systems[4] ibonise ukusebenza kahle kwe-slope, ezinye zisondela emkhawulweni wethiyori.
Izakhiwo Eziyisisekelo
| Ibanga lokuhlushwa le-Ho3+ | 0.005 - 100 i-athomu % |
| I-Emission Wavelength | 2.01 um |
| I-Laser Transition | 5I7 → 5I8 |
| I-Flouresence Lifetime | 8.5 ms |
| Iphampu Wavelength | 1.9 um |
| I-Coefficient of Thermal Expansion | 6.14 x 10-6 K-1 |
| I-Thermal Diffusivity | 0.041 cm2 s-2 |
| I-Thermal Conductivity | 11.2 W m-1 K-1 |
| Ukushisa Okuthile (Cp) | 0.59 J g-1 K-1 |
| I-Thermal Shock Resistant | 800 W m-1 |
| I-Refractive Index @ 632.8 nm | 1.83 |
| dn/dT (Thermal Coefficient of I-Refractive Index) @ 1064nm | 7.8 10-6 K-1 |
| Isisindo samangqamuzana | 593.7 g i-mol-1 |
| I-Melting Point | 1965℃ |
| Ukuminyana | 4.56 g cm-3 |
| Ukuqina kwe-MOHS | 8.25 |
| I-Modulus Encane | 335 gp |
| Amandla Okuqina | 2 gpa |
| Isakhiwo Sekristalu | I-Cubic |
| Umumo Ojwayelekile | |
| I-Y3+ Site Symmetry | D2 |
| I-Lattice Constant | a=12.013 Å |
