Ho:YAG - Ingantacciyar Hanya don Haɓaka Fitar Laser 2.1-μm
Bayanin Samfura
Laser thermokeratoplasty (LTK) ya ci gaba da sauri a cikin 'yan shekarun nan. Babban ka'idar ita ce yin amfani da tasirin photothermal na Laser don sanya filaye na collagen da ke kewaye da cornea ya ragu kuma tsakiyar tsakiya na cornea ya zama kurtosis, don cimma manufar gyara hyperopia da hyperopic astigmatism. Laser Holmium (Ho: YAG Laser) ana ɗaukarsa azaman kayan aiki mai kyau don LTK. Tsawon tsayin Ho: YAG Laser shine 2.06μm, wanda ke cikin Laser tsakiyar infrared. Ana iya shafe shi da kyau ta hanyar nama na corneal, kuma za'a iya zafi da danshi na corneal kuma za'a iya rushe filaye na collagen. Bayan photocoagulation, diamita na corneal surface coagulation zone ne game da 700μm, da kuma zurfin ne 450μm, wanda shi ne kawai hadari nisa daga corneal endothelium. Tun da Seiler et al. (1990) ya fara amfani da Ho: YAG Laser da LTK a cikin nazarin asibiti, Thompson, Durrie, Alio, Koch, Gezer da sauransu sun ci gaba da bayar da rahoton sakamakon binciken su. Ho: YAG Laser LTK an yi amfani dashi a aikin asibiti. Irin wannan hanyoyin don gyara hyperopia sun haɗa da radial keratoplasty da excimer Laser PRK. Idan aka kwatanta da radial keratoplasty, Ho: YAG ya bayyana ya fi tsinkaya game da LTK kuma baya buƙatar shigar da bincike a cikin cornea kuma baya haifar da necrosis na nama na corneal a cikin yankin thermocoagulation. Excimer Laser hyperopic PRK ya bar kawai tsakiyar tsakiya na 2-3mm ba tare da ablation ba, wanda zai iya haifar da ƙarin makanta da hasken dare fiye da Ho: YAG LTK ya bar tsakiya na tsakiya na 5-6mm.Ho: YAG Ho3+ ions doped cikin laser insulating lu'ulu'u sun baje kolin tashoshi na laser daban-daban guda 14, suna aiki a cikin yanayin ɗan lokaci daga CW zuwa yanayin kulle-kulle. Ho: YAG ana amfani da shi azaman ingantacciyar hanya don samar da iskar laser 2.1-μm daga canjin 5I7- 5I8, don aikace-aikacen kamar Laser nesa nesa, aikin tiyata, da yin famfo Mid-IR OPO don cimma iskar 3-5micron. Tsarukan famfo diode kai tsaye da Tm: Fiber Laser tsarin famfo [4] sun nuna ingancin gangara, wasu suna gabatowa iyakar ƙa'idar.
Basic Properties
| Ho3+ kewayon maida hankali | 0.005 - 100 atomic % |
| Tsawon Wave | 2.01 ku |
| Canjin Laser | 5I7 → 5I8 |
| Flouresence Rayuwa | 8.5m ku |
| Tsawon Ruwan Ruwa | 1.9 ku |
| Coefficient na Thermal Expansion | 6.14 x 10-6 K-1 |
| Diffusivity na thermal | 0.041 cm2 s-2 |
| Thermal Conductivity | 11.2 W m-1 K-1 |
| Specific Heat (Cp) | 0.59 J g-1 K-1 |
| Ƙarfafa Shock Resistant | 800 W m-1 |
| Fihirisar Refractive @ 632.8 nm | 1.83 |
| dn/dT (Thermal Coefficient na Fihirisar Refractive) @ 1064nm | 7.8 10-6 K-1 |
| Nauyin Kwayoyin Halitta | 593.7 g mol-1 |
| Matsayin narkewa | 1965 ℃ |
| Yawan yawa | 4.56 g cm-3 |
| MOHS Hardness | 8.25 |
| Modul na Matasa | 335 gpa |
| Ƙarfin Ƙarfi | 2 gpa |
| Tsarin Crystal | Cubic |
| Daidaitaccen Daidaitawa | |
| Y3+ Alamar Yanar Gizo | D2 |
| Lattice Constant | a = 12.013 Å |
