Nano-Structured Optical Fibers Made of Glass- Ceramics, and Phase Separated and Metallic Particle- Containing Glasses
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![Figure 4. Principle (a) double-crucible techniques and (b) melt in tube techniques. Adapted with permission from [142], W](https://thumb-eu.123doks.com/thumbv2/123doknet/13405498.406649/13.892.198.752.314.599/figure-principle-double-crucible-techniques-techniques-adapted-permission.webp)
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