Analysis of monolithic nonplanar ring oscillators by considering the stress-induced birefringence

The principle of monolithic nonplanar ring single-frequency laser was introduced, and eigenpolarization states of monolithic unidirectional travelling wave nonplanar ring oscillator (NPRO) were calculated by Jones matrix. The influences of magnetic field strength, reflection coefficients of the output coupler, incident angle, nonplanar angle and other parameters inside cavity on the loss and loss difference of eigenpolarizations were analyzed. How to choose the parameters of cavity to decrease the loss of eigenpolarization states and increase the loss difference between two eigenpolarization states was pointed out. The influences of the stress direction and the stress-induced birefringence coefficient on the loss and loss difference of the eigenpolarization states in the cavity were discussed by calculating the phase difference between two eigenpolarization states induced by stress birefringence.