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  • Yb:CALGO

  • Yb:CaGdAlO4(called CALGO) is a promising new laser gain material which possess several important advantages. The crystal structure of CALGO is tetragonal. When it is pumped at 979nm under pi configuration, we can get broad emission spectra from 994nm to 1050nm in theta configuration. This implies a very small quantum defect (down to 1.5%) and gives a good expectation of obtaining ultra-short pulse. Its thermal conductivity is also high: k=6.7W/m/K, which means it can be used for high power laser applications.
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CASTECH’s Yb:CaGdAlO4 is featured by

  High absorption coefficient @ 979 nm

  High stimulated emission cross section

  Low laser threshold

  Extremely low quantum defect

  Broad output at 994-1050 nm

  High slope efficiency with diode pumping (up to 55%)

  Various Yb-doping concentration

 

 

Applications

 Over 5.5W output power is obtained by 23W incident pumping diode laser with 10% output coupler.

 Output power as high as 12.5W and 94fs pulses for 28W pumping power was reported. 

 

 

 

Basic Properties:                                                                                                                     

 

Crystal structure

Tetragonal

Point group

I4/mmm

Cell Parameters

a = 3.6585Å;

c = 1.1978 Å

Mohs hardness  

6

Density, g/cm³

4.8

Melting Point(C°)

1850

Thermal conductivity (W/m/K)

K[001] =6.3

K[001] =6.9

Thermal expansion coefficient (10-6 /K)

10.1(//a); 

16.2(//c)

Lasing Wavelength

994-1050nm

Absorption Wavelength

979nm

Absorption Cross Section (pi configuration at 979nm) 

2.7x(10-20)cm²

 

 

Specifications of Yb:CaGdAlO4

Orientation

a or c

 Standard Dopant concentration (at. %)

1%, 2%, 3%, 5%

Maximum length

50mm

Length tolerance, mm

+0.5 / -0.2

Diameter tolerance, mm

+/-0.1

Parallelism

< 30”

Perpendicularity

< 15’ 

Surface quality

10/5 

Coating

AR-coated 

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