Ho, Cr, Tm: YAG – Doped With Chromium, Thulium And Holmium Ions

Short Description:

Ho, Cr, Tm: YAG -yttrium aluminium garnet laser crystals doped with chromium,thulium and holmium ions to provide lasing at 2.13 microns are finding more and more applications, especially in the medical industry.

Product Detail

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Product Description

The inherent advantage of the crystal crystal is that it employs YAG as the host. YAG’s physical, thermal and optical properties are well known and understood by every laser designer. 
Diode or lamp lasers and runable lasers with tunable output between 1350 and 1550 nm employ CTH:YAG (Cr,Tm,Ho:YAG). High thermal conductivity, strong chemical stability, resistance to UV light, and a high damage threshold are all characteristics of Cr4+:YAG. American Elements adheres to applicable ASTM testing standards and produces to a variety of standard grades, including Mil Spec (military grade), ACS, Reagent and Technical Grade, Food, Agricultural and Pharmaceutical Grade, Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia), among others. There are standard and unique packing options. A Reference Calculator for converting between the many units of measurement that are important is also provided, along with other technical, research, and safety (MSDS) information.

Advantages Of Ho:Cr:Tm:YAG Crystal

●  High slope efficiency 
●  Pumped by flash lamp or diode
●  Operates well at room temperature 
●  Operates in a relatively eye-safe wavelength range

Dopant Ion

Cr3+ Concentration 0.85%
Tm3+ Concentration 5.9%
Ho3+ Concentration 0.36%
Operating Spec
Emission Wavelength 2.080 um
Laser Transition 5I7 → 5I8
Flouresence Lifetime 8.5 ms
Pump Wavelength flash lamp or diode pumped
@ 780nm

Basic Properties

Coefficient of Thermal Expansion 6.14 x 10-6 K-1
Thermal Diffusivity 0.041 cm2 s-2
Thermal Conductivity 11.2 W m-1 K-1
Specific Heat (Cp) 0.59 J g-1 K-1
Thermal Shock Resistant 800 W m-1
Refractive Index @ 632.8 nm 1.83
dn/dT (Thermal Coefficient of Refractive Index) @ 1064nm 7.8 10-6 K-1
Melting Point 1965℃
Density 4.56 g cm-3
MOHS Hardness 8.25
Young’s Modulus 335 Gpa
Tensile Strength 2 Gpa
Crystal Structure Cubic
Standard Orientation
Y3+ Site Symmetry D2
Lattice Constant a=12.013 Å
Molecular Weight 593.7 g mol-1

Technical Parameters

Dopant Concentration Ho:~0.35@%  Tm:~5.8@% Cr:~1.5@%
Wavefront Distortion ≤0.125ʎ/inch@1064nm
Rod Sizes Diameter:3-6mm
Upon request of customer
Dimensional Tolerances Diameter:±0.05mm  Length:±0.5mm
Barrel Finish Ground finish:400#Grit
Parallelism < 30"
Perpendicularity ≤5′
Flatness ʎ/10
Surface Quality 10/5
AR coating Reflectivity ≤0.25%@2094nm

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