Modes of a birefringent laser
Abstract
A theory is presented for the modes of a solidstate laser. This theory is capable of describing the field structure and losses associated with the introduction of birefringent elements internal to the resonator structure. The field at an arbitary plane within the resonator is expanded in terms of the complete set of basis modes which would be appropriate to the resonator without the thermally induced birefringence of the laser rod. The basis mode set contains two subsets consisting of orthogonal polarizations. The mode coefficients form a vector which, when operated on by propagation matrix, takes the field on a round trip through the resonator. The complex eigenvalues of this matrix give the phase shifts and losses for each final mode; the corresponding vectors are used to generate the final mode configurations as superpositions of the basis mode functions. The theory was applied to the analysis of an Nd:YAG laser in order to study a modehopping phenomenon which was observed to occur when a quarterwave plate was introduced to the resonator structure. The theory gives good quantitative agreement with the experimental observations.
 Publication:

Lasers '86; Proceedings of the Ninth International Conference on Lasers and Applications
 Pub Date:
 1987
 Bibcode:
 1987laap.conf..546N
 Keywords:

 Birefringence;
 Laser Modes;
 Optical Resonators;
 Solid State Lasers;
 Neodymium Lasers;
 Yag Lasers;
 Lasers and Masers