Fig. 1. Schematic diagram of laser principle of two kinds of single crystal fiber^［11］

Fig. 2. Schematic diagram of LHPG method^［13］

Fig. 3. Diameter control feedback system of laser heated pedestal ^［24］

Fig. 4. Single crystal fiber grown at NRL research institute^［28］

Fig. 5. Single crystal fiber growing equipments of Shandong University

Fig. 6. Growth diagram of μ-PD method

Fig. 7. Various crystals grown by μ-PD method

Fig. 8. Schematic diagram of EFG method^［51］

Fig. 9. Schematic diagram of CDLHPG system^［53］

Fig. 10. Ti：Al₂O₃ single crystal fiber^［54］

Fig. 11. Cladding flexible "C4" Yb：YAG single crystal fiber^［27］

Fig. 12. Preparation of claddings by magnetron sputtering^［55］

Fig. 13. The absorption spectrum and emission spectrum of Yb：YAG crystal^［57］

Fig. 14. Direct Femtosecond amplification structure of double-pass single crystal fiber^［58］

Fig. 15. The structure of high power oscillator based on Yb：YAG single crystal fiber^［59］

Fig. 16. Double pass chirped pulse amplification system of single crystal fiber^［60］

Fig. 17. High energy ultra-short pulse amplification system by coherent beam combination of two single crystal fibers^［61］

Fig. 18. Direct high power femtosecond amplification system based on single crystal fiber^［62］

Fig. 19. Schematic of hybrid single crystal fiber and Yb：YAG thin-rod two-stage amplification system^［64］

Fig. 20. High power ultra-short pulse amplification system based on three-stage single crystal fiber^［65］

Fig. 21. Single-crystal fiber amplification system based on two cascades^［66］

Fig. 22. The schematic diagram of high energy chirped pulse amplification system^［68］

Fig. 23. Hybrid high power chirped pulse amplification system based on silicate glass fiber-single crystal fiber amplifier^［69］