Ho:YAG — IiNdlela eziSebenzayo zokuVelisa i-2.1-μm yokukhutshwa kweLaser
Ingcaciso yeMveliso
I-Laser thermokeratoplasty (LTK) iphuhliswe ngokukhawuleza kwiminyaka yamuva. Umgaqo osisiseko kukusebenzisa impembelelo ye-photothermal ye-laser ukwenza i-collagen fibers ejikeleze i-cornea iyancipha kwaye i-curvature esembindini ye-cornea ibe yi-kurtosis, ukuze kuphunyezwe injongo yokulungisa i-hyperopia kunye ne-hyperopic astigmatism. I-Holmium laser (Ho: YAG laser) ithathwa njengesixhobo esifanelekileyo se-LTK. Ubude be-laser ye-Ho: YAG yi-2.06μm, eyeye-laser ephakathi kwe-infrared. Inokuthi ifakwe ngokufanelekileyo ngezicubu ze-corneal, kwaye umswakama we-corneal unokufudumeza kwaye i-collagen fibers inokutshatyalaliswa. Emva kwe-photocoagulation, i-diameter ye-corneal surface coagulation zone imalunga ne-700μm, kwaye ubunzulu buyi-450μm, umgama okhuselekileyo ukusuka kwi-corneal endothelium. Ekubeni uSeiler et al. (I-1990) yaqala ukusebenzisa i-Ho: YAG laser kunye ne-LTK kwizifundo zeklinikhi, i-Thompson, i-Durrie, i-Alio, i-Koch, i-Gezer kunye nabanye ngokulandelelana babika iziphumo zabo zophando. Ho: YAG laser LTK isetyenziswe kwiklinikhi yokusebenza. Iindlela ezifanayo zokulungisa i-hyperopia ziquka i-radial keratoplasty kunye ne-excimer laser PRK. Xa kuthelekiswa ne-radial keratoplasty, i-Ho: YAG ibonakala iqikelele ngakumbi kwi-LTK kwaye ayifuni ukufakwa kwe-probe kwi-cornea kwaye ayibangeli i-corneal tissue necrosis kwindawo ye-thermocoagulation. I-Excimer laser hyperopic PRK ishiya kuphela uluhlu lwe-corneal oluphakathi kwe-2-3mm ngaphandle kokuchithwa, okunokukhokelela ekumfamekeni ngakumbi kunye nokukhazimula ebusuku kune-Ho: YAG LTK ishiya uluhlu oluphakathi lwe-corneal ye-5-6mm.Ho: YAG Ho3+ ion ifakwe kwi-laser yokukhusela iikristale zibonise i-14 inter-manifold laser channels, ezisebenza ngeendlela zexeshana ukusuka kwi-CW ukuya kwimodi evaliweyo. I-Ho: YAG isetyenziswa ngokuqhelekileyo njengendlela esebenzayo yokuvelisa i-2.1-μm yokukhutshwa kwe-laser ukusuka kwi-5I7- 5I8 inguqu, kwizicelo ezifana ne-laser ye-remote sensing, utyando lwezonyango, kunye nokumpompa i-Mid-IR OPO's ukuphumeza ukukhutshwa kwe-3-5micron. Iinkqubo ngqo diode pumped kunye Tm: Iinkqubo iFayibha Laser pumped [4] baye babonisa ukuphumelela hi ithambeka, abanye esondela umda ithiyori.
Iipropati ezisisiseko
| Uluhlu lokugxininiswa kweHo3 + | 0.005 - 100 atom % |
| I-Emission Wavelength | 2.01 um |
| Laser Transition | 5I7 → 5I8 |
| UBomi beFlouresence | 8.5 mz |
| Impompo yobude bobude | 1.9 um |
| I-Coefficient yoKwandiswa kweThermal | 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 |
| Ubushushu obuthile (Cp) | 0,59 J g-1 K-1 |
| I-Thermal Shock Resistant | 800 W m-1 |
| Refractive Index @ 632.8 nm | 1.83 |
| dn/dT (I-Thermal Coefficient ye Refractive Index) @ 1064nm | 7.8 10-6 K-1 |
| Ubunzima beMolekyuli | 593.7 g mol-1 |
| Indawo yokunyibilika | 1965℃ |
| Ukuxinana | 4.56 g cm-3 |
| Ubunzima be-MOHS | 8.25 |
| Imodulus yolutsha | 335 GPA |
| Tensile strength | 2 Gpa |
| Ulwakhiwo lweCrystal | Cubic |
| Uqhelaniso olusemgangathweni | |
| Y3+ Site Symmetry | D2 |
| I-Lattice Constant | a=12.013 Å |
