Modeling of thermal lensing and higher order ring-mode oscillation in end-pumped cw Nd:YAG lasers

Jacob Frauchiger; Heinz P. Weber

doi:10.1117/12.146953

16 June 1993 Modeling of thermal lensing and higher order ring-mode oscillation in end-pumped cw Nd:YAG lasers

Jacob Frauchiger, Heinz P. Weber

Proceedings Volume 1865, Diode Pumping of Average-Power Solid State Lasers; (1993) https://doi.org/10.1117/12.146953
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

The influence of thermal lensing and mode matching on the oscillating mode in an end pumped Nd:YAG laser is investigated. Thermal lensing was measured by probing the output beam divergence of a dynamically stable resonator. The magnitude of lensing expected due to thermal dispersion was confirmed in a distinct range of adequate mode matching. Measurements on arrangements which typically exhibit higher order ring mode oscillation were performed, and compared to a refined model. The refined model is based on a modified numerical calculation of the eigenstate of the electrical field in the active resonator. The active medium is described by a general complex aperture transmission function. This function defines the transverse mode discrimination in the active resonator. Finally the conditions for fundamental mode oscillation without the use of aperture stops in the active resonator are estimated.

Citation Download Citation

Jacob Frauchiger and Heinz P. Weber "Modeling of thermal lensing and higher order ring-mode oscillation in end-pumped cw Nd:YAG lasers", Proc. SPIE 1865, Diode Pumping of Average-Power Solid State Lasers, (16 June 1993); https://doi.org/10.1117/12.146953

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