Figure 1. Conceptual diagram of Brillouin-based thermometry using a gas-filled hollow-core fibre (HCF). (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure 1. Conceptual diagram of Brillouin-based thermometry using a gas-filled hollow-core fibre (HCF).

Caption

Figure 1. Conceptual diagram of Brillouin-based thermometry using a gas-filled hollow-core fibre (HCF). (a) Counter-propagating pump and probe beams generate an acoustic wave via stimulated Brillouin scattering in the pressurised gas-filled core. Cooling shifts the Brillouin spectrum to lower frequencies — shown here for 30 bar argon at (b) 0°C vs. (c) 23.5°C. Axes: optical frequency difference (horizontal), Brillouin gain (vertical).

Credit

Luc Thévenaz et al.

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