Figure 3 | Scientific Reports

Figure 3

From: Exploiting nonlinear properties of pure and Sn-doped Bi2Te2Se for passive Q-switching of all-polarization maintaining ytterbium- and erbium-doped fiber lasers

Figure 3

Schematic of the fabricated fiber device (not in scale). The PM fiber is polished parallel to fast axis. Distance between cladding and core along the cut is approx. 1–2 µm. Transparency of the upper part of the cladding along the cut is introduced and the quartz block is not shown in order to depict the scheme more clearly (a). Cross-section of the fiber along the cut – dotted line corresponds to the removed part of the cladding (b). Microscope image (Keyence VHX-5000) of the material (BSTS) deposited onto a 1.56 µm side-polished fiber (c).

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