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Optical fibers and gases have been used for many important applications such as Raman scattering, soliton pulse compressionanddeep-ultraviolet light generation. In this talk, I will present three different applications based on optical fibers and gases. First, I will report a strong Brillouin amplification in gas-filled hollow-core fibers at high pressure, exceeding by 6 times the gain observed in standard fibers. Using this implementation, I will discuss, for the first time, a novel gas Brillouin laser and a high-performance distributed temperature sensor. Second, I will present an efficient Brillouin scattering generated by an evanescent field nearby a nanofiber waveguide embedded in a pressurized gas cell. The gain is 11 times larger than the highest Brillouin gain obtained in a gas-filled hollow-core fiber. Potential applications using this platform will also be discussed. Third, I will present an ultra-sensitive optical fiber gas sensor based on photothermal effect in gas-filled hollow-core fiber.
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