Self-mode-locked pulsed monomode laser

Area of Science:

• * Laser Physics
• * Quantum Optics
• * Solid-State Lasers

Background:

• * Understanding laser operation dynamics is crucial for developing advanced laser systems.
• * Previous models of monomode solid-state lasers often simplified the complex interactions of light polarization and phase.
• * The Maxwell-Bloch equations are fundamental for describing laser behavior but require careful adaptation for specific cavity conditions.

Purpose of the Study:

• * To predict and experimentally verify a novel pulsed-laser operation regime in monomode solid-state lasers.
• * To investigate the influence of coupled cold-cavity eigenstates, including their phases and polarizations, on laser output.
• * To demonstrate the practical applicability of the findings using a Nd:YAG microchip laser.

Main Methods:

• * Theoretical derivation of modified Maxwell-Bloch equations incorporating phase and polarization dynamics of two coupled cold-cavity eigenstates.
• * Experimental setup designed to observe laser output without conventional mode-locking or Q-switching techniques.
• * Spectroscopic analysis and pulse characterization to validate theoretical predictions.

Main Results:

• * Prediction and observation of a new, distinct pulsed-laser operation regime.
• * Experimental confirmation of the regime in a Nd:YAG microchip laser system.
• * Generation of sech(2) pulses at high repetition rates (megahertz range) without external modulation.

Conclusions:

• * The study reveals a previously unrecognized pulsed-laser regime driven by intrinsic phase and polarization dynamics.
• * Theoretical predictions align closely with experimental observations, validating the enhanced Maxwell-Bloch model.
• * This finding offers new pathways for generating high-repetition-rate ultrashort pulses from solid-state lasers.