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    Yb:CaGdAlO4

    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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    Description

    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 (phi 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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