Cr, Tm, Ho: YAG – Laser Crystal – Gain Medium – Customized Products

Product ID: 6590


Cr, Tm, Ho: YAG – Laser Crystal – Gain Medium – Customized Products

Cr, Tm, Ho: YAG is a high efficient laser crystal pumped by a Xenon lamp or diode with a wavelength of 2.1μm. The pump source mainly originates from the flashlamp energy absorbed by Cr3+, Ho3+ is a working ion, and Tm3+ acts as an intermediary to transfer energy. 2.1 μm laser wave can be absorbed by water very well, transmits atmosphere easily, and is safe to the eye. Therefore, it is widely used in medical treatment, laser radar, the military, etc. Moreover, a 2.1 μm laser is an ideal pump source for a 3-5 μm mid-infrared optical parametric oscillator.

$100 is a deposit, not the final price of the product. Please contact us for price if needed.


Wide absorption band
Working at room temperature
2.1 mm lasing wavelength is for the eye
High slope efficiency
It can be pumped by a flashlamp or diode

Material Specifications

Doping Concentration Ho:0.3~0.4at% Cr:0.3~1.2at% Tm:5~6at%
Wavefront Aberration <λ/4@632nm
Extinction Ratio ≥25 dB
Size Diameter:3~6mm,Length:50~120mm
Size Tolerance Diameter:+0.00/-0.05mm, Length: ± 0.5mm
Precision Grinding 50-80 Micro Inches(RMS)
Parallelism ≤30″
Perpendicularity ≤5′
Flatness λ/10@ 633 nm
Surface Finish 10/5 Scratch / Digper MIL-O-1380A
Chamfer 0.006″±0.002″ at 45°± 5°
High Permeable Film Reflectivity ≤ 0.25% (@2094nm)

Physical and Chemical Properties

Structure Cubic
Lattice Constant 12.01Å
Melting Point 1970°C
Density 4.56g/cm3
Orientation <111> or <100]> 5°
Thermal Expansion 7.8×10-6 /K
Coefficient of Thermal Conductivity 14W/m/K, 20°C;10.5W/m/K, 100°C
Mohs hardness 8.5
Dielectric Constant 11.7

Optical and Spectral Properties

Laser Transition 5I7 → 5I8
Laser Wavelength  2.094 µm
Photon Energy 9.55 x 10–20 J
Radiation Cross Section 7 x 10-21 cm2
Fluorescence Lifetime 8.5 ms
Refractive Index 1.80 @2.08 µm
Aperture >90%
Absorption Line Width 4 nm
Diode Pump Band 781 nm
Main Pump Belt 400~800 nm


Absorption and Emission Spectra

TaorLab laser crystals