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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.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. It has wide applications in surgery, dentistry, atmospheric testing, etc.

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 ?
Molecular Weight	593.7 g mol-1
Technical Parameters
Dopant Concentration	Ho:~0.35@% Tm:~5.8@% Cr:~1.5@%
Wavefront Distortion	≤0.125?/inch@1064nm
Rod Sizes	Diameter:3-6mm
	Length:50-120mm
	Upon request of customer
Dimensional Tolerances	Diameter:±0.05mm Length:±0.5mm
Barrel Finish	Ground finish:400#Grit
Parallelism	< 30"
Perpendicularity	≤5′
Flatness	?/10
Surface Quality	10/5
AR coating Reflectivity	≤0.25%@2094nm

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