Figure 5
From: Application of a self-injection locked cyan laser for Barium ion cooling and spectroscopy
Frequency noise of the self-injection locked laser measured using Fabry-Perot etalon. The peaks near 800 Hz are measured mechanical modes of the etalon, and the laser frequency noise reaches the measurement noise floor of 300 Hz\(^2\)/Hz at approximately 100 kHz. The red line is a numerical fit to the data with a \(f^{-1.6}\) frequency dependence. By integrating this fit, we find an effective linewidth of 14 kHz. The instantaneous linewidth limit of this laser, given by \(\pi \) times the measurement noise floor6, is \(\approx \) 1 kHz.
