Instability Risk and Beam Profile Variation in Optical Ring Resonator due to Thin Gradient Index Lens

Khalid Ali Khan; Suleyman Malikmyradovich Nokerov

doi:10.46604/peti.2021.6551

Authors

Khalid Ali Khan Department of Electrical and Computer Engineering, Mettu University, Mettu, Ethiopia
Suleyman Malikmyradovich Nokerov Oguz Han Engineering and Technology University of Turkmenistan, City Ashgabat, Turkmenistan

DOI:

https://doi.org/10.46604/peti.2021.6551

Keywords:

optical ring resonator, GRIN lens, resonator stability, ABCD matrix, beam propagation microstrip

Abstract

In this study, a simple ring resonator model in presence of thin gradient index (GRIN) lens is investigated to characterize the optical beam maginification quality beyond its traditional modalities. This model allow us to vary and control the limit of resonator stability more significantly.It consist of two folding arms and each arm can be realized by its cavity components. Insertation of thin GRIN lens ( thickness < 9.3mm) in ring resonator, mainly in between first folding range gives the magnified output beams and meets the beam expander feature for the laser. Variation of GRIN lens thickness (L) is an emphatic and influencing parameter than its refractive index (n) to disturb the resonator stability. Resonator stability in Tangential (T) plane is relatively more sensitive than sagittal (S) plane. Vigorous magnification in optical beam size at the end of output range in a cavity is the noticeable consequences because of GRIN lens.

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