Noise propagation from pump to secondary lasers

Area of Science:

• * Laser physics
• * Nonlinear optics
• * Quantum optics

Background:

• * Laser intensity fluctuations can impact experimental outcomes.
• * Understanding the relationship between pump and secondary laser dynamics is crucial for applications.
• * Previous models may not fully capture the complex interplay of noise in laser systems.

Purpose of the Study:

• * To experimentally investigate the intensity fluctuations of a secondary dye laser influenced by an argon pump laser.
• * To analyze the power spectra of both lasers under varying operating conditions.
• * To develop and validate a theoretical model for laser noise propagation.

Main Methods:

• * Experimental measurement of intensity fluctuations and power spectra for both pump and secondary lasers.
• * Operation of the secondary laser both far above and close to its lasing threshold.
• * Development of a theoretical laser model incorporating multiplicative colored noise to represent pump fluctuations.

Main Results:

• * The secondary laser mirrors pump fluctuations when significantly above threshold.
• * The secondary laser functions as a low-pass filter for pump fluctuations when near threshold.
• * The proposed theoretical model accurately predicts the observed experimental behaviors.

Conclusions:

• * The behavior of secondary lasers concerning pump fluctuations is highly dependent on operating threshold.
• * A multiplicative colored-noise model effectively describes pump fluctuation effects on secondary lasers.
• * Strong quantitative agreement validates the theoretical model and experimental findings.