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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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                  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 = 3.6585?;

                  c = 1.1978 ?   

                  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. %)


                  2%, 3%, 5%, 10%

                  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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