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The dielectric response of crosslinked polyethylene (XLPE) insulated, miniature power cables, extruded with inner and outer semicons, was measured over the frequency range 10-4 to 104 Hz at temperatures from 20 to 100 °C. A dielectric spectrometer was used for the frequency range 10-4 to 10-2 Hz. A bespoke noise-free power supply was constructed and used to measure the dc conductivity and, using a...
The frequency comb technique is a very useful method to measure the frequency of lasers accurately. The authors proposed a new method that is simpler and can be used for both high and low repetition rate frequency combs without the help of a wavemeter. The method is a two-step process. The authors first obtain a rough estimate of N by changing the repetition rate fr. a small amount such that no mode...
We report recent improvement in absolute frequency measurement of the 115In+5s21S0-5s5p 3P0 clock transition at 236.5 nm. Using a narrowline laser as a local oscillator, a linewidth of 43 Hz for the transition is resolved. The uncertainty of the transition frequency's centroid is 18 Hz, leading to a fractional uncertainty of 1.4 x 10-14. In the experiment, a single 115In+is trapped in a three-ring...
We report an improved absolute frequency measurement of the 5s21S0 -5s5p 3P0 narrowline clock transition at 236.5 nm, for a single trapped and laser cooled 115In+. Using a narrowline laser as the local oscillator, a linewidth of 43 Hz for the transition is resolved. For absolute frequency measurement we use an optical frequency comb referenced to a cesium clock The transition frequency is found to...
We demonstrate a method to determine the absolute mode number of a frequency comb when it is used for high precision laser frequency measurement, without the help of wavemeters. Our technique involves changing the repetition rate of the frequency comb in a two-steps process. Guidelines for choosing the correct repetition rates for different laser linewidths are given. As a demonstration, the absolute...
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