Chromium, Thulium, Holmium: Yttrium Aluminum Garnet - CTH:YAG CTH:YAG is a new crystal material which lases at 2080 nm. It has applications in medical, military and meteorological fields. The key to efficient operation lies in the energy transfer processes between co-dopants of Cr, Tm and Ho. Cr3+ acts to effectively absorb flashlamp energy, which is then transferred to the Tm3+ with an efficiency of > 90%. A Tm:Tm cross relaxation then occurs and transfers this energy to the Ho with a quantum efficiency approaching 2. Advantages Of Cr,Tm,Ho:YAG Include: High-efficiency 2 µm source Operates well at room temperature(1) May be flashlamp or diode pumped Laser diode sources can pump the strong 780 nm Tm3+ ion absorption line Chromium doping not necessary for diode-pumped applications Pump line width of 4 nm; 4 times wider than the corresponding Nd:YAG diode-pump line width Operates in a relatively eye-safe wavelength range Applications in medical, military and scientific lasers Properties Cr, Tm, Ho;YAG Lasing Properties Lasing Transition: Lasing Wavelength Fluorescence Lifetime Stimulated Emission Cross-Section: Index of Refraction: Diode Pump Band: Absorption Linewidth: Major Pump Bands:

Standard Specifications Material Parameters Host: Standard Melt Concentration: Yttrium Aluminum Garnet (Y3AI5O12) Chromium (Cr3+): 0.85 at % Thulium (Tm3+): 5.90 at % Holmium (Ho3+): 0.36 at % (Other Compositions Available) [111] crystallographic directions ± 5° less than 1/2 wave per inch of length @ 1064 nm Orientation: Wavefront Distortion: Diameter: Length: Barrel Finish: Chamfer: End Configuration within λ / 10 wave at 633 nm wavelength within 30 seconds of arc less than 5 minutes of arc scratch-dig 10 - 5 per MIL-O-13830A Flatness: Parallelism: Perpendicularity: Surface Quality: Anti-Reflection...