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

We have applied a new simplified combination of numerical methods for studying the time and three-dimensional 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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Informasi Detail

Judul Seri

IEEE JOURNAL OF QUANTUM ELECTRONICS; Vol.57 No.1 February 2021

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 1700115

Bahasa

English

ISBN/ISSN

-

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

Q-SWITCHING
SOLID LASERS
YTTERBIUM
FINITE DIFFERENCE METHODS
OPTICAL PULSES
LASER RESONATORS

Info Detail Spesifik

DOI: 10.1109/JQE.2020.3027430

Pernyataan Tanggungjawab

Stephen R. Chinn, Jeffrey H. Leach, Chris McIntosh, A. D. Hays, Lew Goldberg

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