Fig. 1. Schematic diagram of beam quality measurement device of compressed beam laser

Fig. 2. Physical drawing of wave aberration measurement device of compressed beam components

Fig. 3. PV values of compressed beam components vary with filed of view

Fig. 4. Variation conditions of beam quality factor M² with field of view

Fig. 5. Polarization-splitting experimental device

Fig. 6. Power variation of quasi-single mode laser after passing through attenuation

Fig. 7. Power variation of multi-mode laser after passing through attenuation

Fig. 8. Beam quality measurement device of high reflection type for high power fiber laser

Fig. 9. Beam quality measurement device of wedge-plate type for high power fiber laser

Fig. 10. Beam quality measurement results of high reflection type

Fig. 11. Temperature of high reflection mirror at 1 kW power

Fig. 12. Beam quality results without compressed beam components

Fig. 13. Diameters of light spot before and after beam compression

Fig. 14. Beam quality results of wedge-plate type

Fig. 15. Comparison of beam quality results between high reflection type and wedge-plate type