Although population dynamics play an important role on the characteristics of laser emission, the polarization properties of fiber lasers are established by the birefringence of the laser cavity. While the use of fibers with low birefringence (Low-Bi) will yield polarization features that can be easily altered by means of polarization controllers, fibers with high birefringence (Hi-Bi) yield more stable polarization features. Although in most cases stable oscillation frequencies from a fiber laser are desired, some applications require adjustments either on the spectral or the polarization characteristics of the laser output. This can be easily achieved by combining both Hi-Bi and Low-Bi fibers to form a hybrid birefringence resonator. In this paper we study the transmission characteristics for these fiber resonators using Jones matrix analysis. This yields information on relevant laser characteristics as a function of different parameters for the Low-Bi and Hi-Bi fibers (e.g., birefringence, length and orientation of the birefringent axes). In particular, we focus on the theoretical predictions on tunability of polarization mode beating frequencies (PMB) as a function of wavelength and effective birefringence of the laser cavity. The results are compared with experiments involving fiber polarimetric sensors, tunable optical generators of microwaves and wavelength measurement of fiber lasers through PMB frequencies.
We propose a method for piston errors detection in a segmented surface by means of the classical ronchi test. This consists in comparing the ronchigram fringes frequency of a reference and piston segment. The comparison is developed for the correlation method of the intensity vs pixels curves of the reference and piston segment. The presence of the piston term in a ronchigram is assured experimentally for the shack interferometer, it is by observing the coincidence rings centered type fizeau in each segment. The proposed method is applied to a segmented spherical surface with a two segment mirrors, and resolutions of piston ⩾63 ηm are experimentally obtained.
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