A physical model of an external-cavity tunable laser (ECTL) utilizing the vernier effect a dual Fabry–Perot (FP) etalon is presented and simulated using finite-difference traveling wave (FDTW) method. In this paper, we provide detailed explanation principle construction process model, as well simulation results for laser. The precisely established by studying time-dependent changes in carrier c...

A simple method based on air etalons of a transparent cavity is proposed to simultaneously measure the group refractive index and thickness of a transparent optical plate by spectral domain low coherence interferometry. In this method, only a single beam path is needed in contrast to the two beam paths, the reference and sample arms, of the conventional Michelson interferometer. An empty cavity...

The center frequency of the narrow-band THz wave is always unstable with the optical rectification methods. Therefore, the high-phase stable time-delay generator Etalon and the parallel grating pair compressor with the self-adaptive optical path compensation function are designed according to the principle that two lasers in different paths will result in specific relative time delay; with LiNb...