Sánchez Quesada, Francisco2023-06-212023-06-2119740003-693510.1364/AO.13.001071https://hdl.handle.net/20.500.14352/64953© Optical Society of America. We gratefully acknowledge C. Manus and G. Mainfray for their constant encouragements in performing this work, and we are very indebted to D. Fondant for his technical assistance.This paper describes a single transverse mode Q-switched Nd 3+ glass laser working on a few longitudinal adjacent modes. The narrowing of the spectral output is obtained by use of a resonant reflector and a birefringent filter under temperature control. The number of longitudinal modes is varied from one to ten with a constant energy output of 10 mJ by means of intracavity resonators and two-step Q-switching. Observations of the quasiperiodic intensity fluctuations during the 40-nsec pulse give information about the statistical character of multimode giant pulse laser emission.engjournal articlehttp://www.dx.doi.org/10.1364/AO.13.001071http://www.opticsinfobase.orgrestricted access537Optics.ElectricidadElectrónica (Física)2202.03 Electricidad