Ho:YAG — Ib Txoj Kev Siv Tau Los Tsim 2.1-μm Laser Emission
Product Description
Laser thermokeratoplasty (LTK) tau tsim sai heev hauv xyoo tas los no. Lub hauv paus ntsiab lus tseem ceeb yog siv cov nyhuv photothermal ntawm laser los ua kom cov collagen fibers nyob ib ncig ntawm lub pob ntseg ntsws thiab lub hauv paus curvature ntawm lub cornea ua kurtosis, thiaj li ua tiav lub hom phiaj ntawm kev kho hyperopia thiab hyperopic astigmatism. Holmium laser (Ho:YAG laser) yog ib qho cuab yeej zoo rau LTK. Lub wavelength ntawm Ho:YAG laser yog 2.06μm, uas belongs rau nruab nrab-infrared laser. Nws tuaj yeem nqus tau zoo los ntawm pob txha cov ntaub so ntswg, thiab lub pob txha ya raws tuaj yeem ua kom sov thiab cov collagen fibers tuaj yeem ua rau shrunk. Tom qab photocoagulation, txoj kab uas hla ntawm lub pob zeb nto coagulation cheeb tsam yog li 700μm, thiab qhov tob yog 450μm, uas tsuas yog ib qho kev nyab xeeb ntawm lub pob txha endothelium. Txij li thaum Seiler et al. (1990) thawj zaug siv Ho:YAG laser thiab LTK hauv kev tshawb fawb soj ntsuam, Thompson, Durrie, Alio, Koch, Gezer thiab lwm tus tau tshaj tawm lawv cov txiaj ntsig kev tshawb fawb. Ho: YAG laser LTK tau siv hauv kev kho mob. Cov kev zoo sib xws los kho hyperopia suav nrog radial keratoplasty thiab excimer laser PRK. Piv nrog rau radial keratoplasty, Ho:YAG zoo li yuav muaj kev kwv yees ntau dua ntawm LTK thiab tsis tas yuav tsum muaj qhov kev sojntsuam rau hauv lub pob txha thiab tsis ua rau lub pob txha necrosis hauv thaj chaw thermocoagulation. Excimer laser hyperopic PRK tawm tsuas yog lub hauv paus pob txha ntawm 2-3 hli yam tsis muaj ablation, uas yuav ua rau ntau qhov muag tsis pom thiab hmo ntuj glare dua Ho: YAG LTK tawm hauv nruab nrab pob txha ntau ntawm 5-6 hli.Ho: YAG Ho3+ ions doped rau hauv insulating laser Crystals tau nthuav tawm 14 inter-manifold laser channels, kev khiav hauj lwm nyob rau hauv temporal hom los ntawm CW mus rau hom-xauv. Ho: YAG feem ntau yog siv los ua ib qho txiaj ntsig zoo los tsim 2.1-μm laser emission los ntawm 5I7- 5I8 kev hloov pauv, rau kev siv xws li laser tej thaj chaw deb sensing, kho mob phais, thiab siv Mid-IR OPO's kom ua tiav 3-5micron emission. Direct diode pumped systems thiab Tm: Fiber Laser pumped systems[4] tau ua kom pom qhov zoo ntawm txoj kab nqes, qee qhov nce mus txog qhov kev txwv.
Cov cuab yeej yooj yim
| Ho3+ concentration ntau | 0.005-100% atomic |
| Emission wavelength ntawm lub teeb | 2.01 ua |
| Laser Hloov | 5I7 → 5I8 |
| Flouresence Lub Neej | 8.5ms ib |
| Pump Wavelength | 1.9 ua |
| Coefficient ntawm Thermal Expansion | 6.14 x 10-6 K-1 |
| Thermal Diffusivity | 0.041cm2s-2 |
| Thermal conductivity | 11.2 W m-1 K-1 |
| Thaum tshav kub kub (Cp) | 0.59 J g-1 K-1 |
| Thermal Shock Resistant | 800 W m-1 |
| Refractive Index @ 632.8 nm | 1.83 ib |
| dn/dT (Thermal Coefficient of Refractive Index) @ 1064nm | 7.8 10-6 K-1 |
| Molecular Luj | 593.7g mol-1 |
| Melting Point | 1965 ℃ |
| Qhov ntom | 4.56 g cm3 |
| MOHS Hardness | 8.25 Nws |
| Young's Modulus | 335gp ua |
| Tensile zog | 2 Gpa ua |
| Crystal Structure | Kub |
| Standard Orientation | |
| Y3+ Site Symmetry | D2 |
| Lattice Constant | ib = 12.013 Å |
