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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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