An interferometric arrangement that automatically compensates for thermal expansion was used to examine the changes in the refractive index of liquid water at 632.8 nm as a function of temperature from 10 to -15 °C. By combining the results of this research with existing data, we calculated the absolute refractive index in the supercooled region with an accuracy ranging from 3 × 10-6 to 1 × 10-5. A direct observation of the refractive-index maximum of water is reported for the first time to our knowledge and found to occur between 0 and 0.1 °C.
© 2002 Optical Society of America
Original Manuscript: November 13, 2000
Revised Manuscript: July 26, 2001
Published: March 1, 2002
Lee Carroll and Martin Henry, "Autocompensating interferometer for measuring the changes in refractive index of supercooled water as a function of temperature at 632.8 nm," Appl. Opt. 41, 1330-1336 (2002)