Interferometric measurement of the resonant absorption and refractive index in rubidium gas

Interferometric measurement of the resonant absorption and refractive index in rubidium gas

We present a laboratory demonstration of the Kramers-Kronig relation between the resonant absorption and refractive index in rubidium gas. Our experiment uses a rubidium vapor cell in one arm of a simple Mach-Zehnder interferometer. As the laser frequency is scanned over an atomic resonance, the interferometer output is affected by variations of both the absorption and refractive index of the g...

Gas analysis by refractive index measurement.

A B C light in a medium is difficult, it is quite easy to compare the velocity of light in one medium with the velocity of light in another. A suitable instrument for this purpose is the Rayleigh Interference Refractometer. This instrument is shown diagramatically in figures 1 and 2. Figure 1 is a plan view showing the components as they appear from above. Figure 2 is a side view of the same ar...

Resonant Negative Refractive Index Metamaterials

Interferometric determination of the refractive index of liquid sulphur dioxide

The absolute refractive index of liquid sulphur dioxide (SO2) was determined with an uncertainty of ±0.0007 with the help of a Michelson interferometer and a computer-controlled rotatory stage supporting a rectangular fused silica cell, containing the liquid. The measurements were performed at temperatures around 20 ◦C for the laser line wavelengths 632.8, 514.5 and 488.0 nm. The experimental d...

Measurement of resonant and nonresonant induced refractive index changes in Yb-doped fiber grating amplifier.

We have measured the refractive index change (RIC) induced in a fiber Bragg grating (FBG) written in a Yb-doped fiber amplifier (YB-FBG) because of the amplifier pumping. The measurement was performed by exploiting the high sensitivity of the YD-FBG transmission to the RIC. We have separated between electronic and thermal contributions to the RIC based on the difference between the time-scales ...