Fig. 1. Structural diagrams of bioprobe and hollow fiber. (a) Structure of bioprobe; (b) structure of hollow fiber (d₁=420 nm, d₂=150 nm, and d₃=50 μm)

Fig. 2. Schematic of system for sealed window fabrication

Fig. 3. Diagrams of evaluation system. (a) Loss spectrum measurement; (b) loss measurement; (c) beam profile measurement

Fig. 4. Relationship between beam radius and d'

Fig. 5. Loss spectra of hollow fiber

Fig. 6. Bending loss properties of red and green lasers

Fig. 7. Loss spectra of unsealed and sealed hollow fibers

Fig. 8. Shapes of sealed windows. (a) Biconcave shape; (b) convex-concave shape; (c) flat; (d) biconcave shape after secondary sealing; (e) biconcave shape under microscope

Fig. 9. Output spots of sealed fibers with different shapes of sealed window. (a) Unsealed; (b) biconcave; (c) convex-concave

Fig. 10. Output spots of secondary sealed fibers. (a) Sealed fiber based on biconcave shape; (b) sealed fiber based on convex-concave shape

Fig. 11. Relationship between beam radius and d' of sealed fibers. (a) Primary sealing; (b) secondary sealing