Triple-doped Holmium:Chromium:Thulium YAG (Ho:Cr:Tm:YAG) is a laser material which emits radiation at 2097 nm. HCT:YAG can be pumped by a flashlamp or with laser diodes. It is widely used in military, medicine, and meteorology. Lasers It can work at room temperature, has high slope efficiency, and operates at a wavelength where the threshold for eye damage is relatively high. Main diode pump band is at 785 nm but it can also be pumped between 400 and 800 nm.


Optola offers wide range of HCT:YAG crystals sizes by request. 



<111> or <100> crystalline within 5°

Wavefront distortion :

λ/8 per inch @ 633 nm

Extinction Ratio:


Dimension Tolerances

Rods with diameter: ±0.03 mm , Length: ±0.5 mm

Surface quality:

10/5 Scratch / Dig


< 10 arc seconds


< 5 arc minutes


λ/10 @ 633 nm


<0.1 mm @ 45deg.

Barrel Finish:

50-80 micro-inch (RMS) ,

AR Coating Reflectivity


Laser Wavelength

2.097 µm

Photon Energy

9.55 x 10-20 J

Emission Cross Section

7 x 10-21 cm2

Fluorescence Lifetime

8.5 ms

Index of Refraction

1.80 @2.08 µm                                   

Absorption Linewidth

4 nm

Diode Pump Band                      

781 nm

Major Pump Bands

400~800 nm

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