Ho:Cr:Tm:YAG
 
 


Ho:Cr:Tm:YAG is a high efficiency laser material which lasers at 2.1µm. It has wide applications in medical, military and meteorology fields.

 

   1. May be flash lamp or diode pumped

   2. Very high slope efficiency

   3. Operates well at room temperature 

  4. Operates in a relatively eye-safe wavelength range High efficiency 

 

 

 

 

 

 

Optical and Spectral Properties

  

Doping(atm%):

Ho: ~ 0.35 at%, Tm: ~ 5.8 at%,Cr:~1.5at%

Laser Transition

5 I 7 - 5 I 8

Laser Wavelength 

2.097 µm 

Photon Energy

9.55 x 10 -20 J

Emission Cross Section 

7 x 10 -21 cm 2

Fluorescence Lifetime

8.5 ms

Absorption Linewidth 

4 nm

Diode Pump Band 

781 nm

Major Pump Bands

400~800 nm

Index of Refraction 

1.80 @2.08 µm

  

 

  

 

Specifications

 

Orientation:

<111> or <100> crystalline within 5°

Wavefront distortion :

1/8 lambda per inch @ 633 nm

Extinction Ratio:

>25dB

Dimension Tolerances

Rods with diameter: ±0.025 mm , Length: ±0.5 mm

Surface quality:

10/5 Scratch / Digper MIL-O-1380A

Parallelism:

< 10 arc seconds

Perpendicularity:

< 5 arc minutes

Flatness:

<1/10 lambda @ 633 nm

chamfer:

<0.1 mm @ 45deg.

Barrel Finish:

50-80 micro-inch (RMS) ,

AR Coating Reflectivity

<0.25%

 

 

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