Dynamic multimode analysis of high-power 3-level lasers

Wohlmuth, Matthias; Pflaum, Christoph

doi:10.1016/j.phpro.2010.08.055

Cited by 3 publications

(1 citation statement)

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“…In the present work we incorporate both the effects of gain and thermal mode confinement in a simultaneous unified approach using a finite-difference beam propagation method (FD-BPM). We contrast this method with "dynamic multimode analysis" 21,22,23 in which a commercial modeling package provides tools for multi-transverse-mode Gaussian expansion of the laser field to investigate laser dynamics. These modal expansion analyses did not include our regime of CW-pumping with passively-Qswitched self-pulsing operation.…”

Section: Introductionmentioning

confidence: 99%

Numeric Multi-Dimensional (r, z, t) Analysis Method for Compact Yb³⁺:YAG End-Pumped, Passively Q-Switched Lasers

Chinn

Leach

McIntosh

et al. 2021

IEEE J. Quantum Electron.

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We have applied a new simplified combination of numerical methods for studying the time and threedimensional space dependence of quasi-three-level Yb 3+ :Yttrium Aluminum Garnet (YAG) end-pumped lasers passively Q-switched by a Cr 4+ :YAG saturable absorber. We base our 3-D model on iterative, efficient, time-and space-dependent numerical propagation of the optical field through the laser cavity. The complex-valued laser field is coupled to the Yb 3+ :YAG and Cr 4+ :YAG media via complex optical permittivities, which are subsequently altered by gain/loss intensity saturation. The calculation is simplified using the radial symmetry of the system, with the cavity round-trip time as the smallest increment for updating the permittivities. We also include the effects of field diffraction in an intra-cavity air gap. For specified CW spatial pump conditions, self-consistent repetitively pulsed solutions for the laser field in a flat-flat or flat-convex mirror cavity are found with no ad hoc laser mode size or shape assumptions; these solutions are not Gaussian modes. We concentrate on compact lasers with multi-Watt average output power, operating at modest pulse energy (~1.0 mJ), high repetition rate (~5 kHz) and short pulse duration (~1.5 ns). Typical room-temperature pump-to-laser slope power efficiencies exceeding 50% are predicted, depending on laser pump and cavity loss parameters. Model results agree well with recently published experimental data.

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Section: Introductionmentioning

confidence: 99%