What is the value of Thermo-optic co-efficient for water and air at 1550 nm?
For deionized water, follow the link below to a free article by Young Ho Kim et al.; in chapter 4, Fig. 8 a) shows simulated and measured values of the refractive index of water at 1550 nm, at temperatures from about +5° to 95° C. Since the variation over this temperature range is less than 1% for water, I wouldn't be surprised if the effect is not measurable in air.
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-20-21-23744
For refractive index of air as a function of wavelength, temperature and pressure, try Kaye & Laby: http://www.kayelaby.npl.co.uk/general_physics/2_5/2_5_7.html
The main formula is for dry air, but they include a correction for the wavelength and partial pressure dependence of moist air.
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