Frequency stabilization of a diode laser using electromagnetically induced transparency in a V-configuration cesium atom |
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Authors: | A Ray S Pradhan K G Manohar B N Jagatap |
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Institution: | (1) Laser and Plasma Technology Division, Bhabha Atomic Research Center, Mumbai, 400085, India;(2) Homi Bhabha National Institute, Mumbai, 400094, India |
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Abstract: | An electromagnetically induced transparency (EIT) signal is observed in a V-type energy level scheme in a cesium vapor cell at room temperature. The effects of frequency detuning and the intensity of the pump laser on the EIT signal have been investigated. The performance of the probe-diode laser system, which is frequency stabilized on the EIT signal by using electrical feedback, is explored. The first derivative of the EIT signal offers a steeper slope and better S/N ratio for laser frequency stabilization than that of the Doppler-free hyperfine and crossover resonances. A comparative study of the frequency stability of an external-cavity diode laser stabilized at EIT and at the crossover resonance is presented. The square root of the Allan variance (σ) vs. integration time (τ) plot shows about a tenfold improvement in the frequency stability of the EIT-locked laser (σ ~ 2.043 × 10?13τ?1/2) over that of the crossover-locked laser under a short integration time (1–10 ms), whereas a twofold improvement is found under a long integration time (~1 s). |
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