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                ms4RGnB8TGW0Q-3POYtqDw
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                • Yb:YAG

                • Yb:YAG is one of the most promising laser-active materials and more suitable for diode-pumping than the traditional Nd-doped systems. Compared with the commonly used Nd:YAG crystal, Yb:YAG crystal has a much larger absorption bandwidth to reduce thermal management requirements for diode lasers, a longer upper-laser level lifetime, three to four times lower thermal loading per unit pump power. Yb:YAG crystal at 1030nm is a good substitute for a Nd:YAG crystal at 1064nm and its second harmonic at 515nm may replace Ar-ion laser (with a large volume), which emit at 514nm.
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                Advantages of Yb:YAG Crystal:

                       •  Very low fractional heating, less than 11%;
                       •  Very high slope efficiency;
                       •  Broad absorption bands, about 8nm @940nm;
                       •  No excited-state absorption or up-conversion;  
                       •  Conveniently pumped by reliable InGaAs diodes at 940nm(or 970nm);  
                       •  High thermal conductivity and large mechanical strength;   
                       •  High optical quality.

                 

                Table 1. Material and Specifications

                Dopant concentration

                Yb:  5~15 at%

                Wavefront Distortion

                ≤ 0.125λ/inch

                Extinction Ratio

                ≥28 dB

                Rod Sizes

                Diameter:2~20mm, Length:5~150mm 

                Upon request of customer  

                Dimensional Tolerances

                Diameter:+0.00“/-0.002”mm, Length: ± 0.02"

                Barrel Finish

                Ground Finish: 400# Grit

                Parallelism

                ≤10″

                Perpendicularity

                ≤5′

                Flatness

                λ/10

                Surface Quality

                10/5 (MIL-PRF-13830B)

                Chamfer

                0.006"±0.002" at 45°± 5°

                AR Coating Reflectivity

                ≤ 0.25% (@1030nm)

                Single pass loss

                <3×10-3 cm-1

                 

                 

                Table 2. Optical and Spectral Properties of Yb:YAG Crystal

                Laser Transition

                2 F 5/22 F 7/2

                Laser Wavelength

                1030nm

                Photon Energy

                1.93×10-19 J(@1030nm)                              

                Emission Linewidth

                9nm

                Emission Cross Section

                2.0×10-20 cm2

                Fluorescence Lifetime

                1.2ms

                Diode Pump Band           

                940nm or 970nm

                Pump Absorption Band Width

                8nm

                Index of Refraction

                1.82

                Thermal Optical Coefficient

                9×10-6/℃

                Loss Coefficient

                0.003 cm-1

                 

                 

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