The WLC concept was originally proposed by Wicht et al. Superluminal and WLCs have been the focus of intense study due to their unique properties as well as potential applications, primarily sensing. Inset: amplitude and phase transmission properties. 1 Schematics of white light cavity implementations. At the specific scenario where this phase components compensates exactly the propagation phase, the group velocity becomes infinite ( n g = 0) and the cavity is denoted as a white light cavity (WLC).ДЇig. Regarding the second implementation, the additional cavity must be under-coupled if it is to provide a negative phase slope. Figure 1 shows two optional implementations of such phase components вЂ“ an atomic absorption line and an under-coupled (lossy) resonator. Such phase response can be obtained, for example, by an absorptive element, utilizing the Kramers-Kronig relations. Such a cavity can be realized by introducing into the optical path a dispersive phase compensation mechanism having a negative phase slope with respect to the frequency. Superluminal cavities correspond to cavities whose average group velocity is larger than the speed of light (i.e.

Introducing dispersive elements into cavities allows for controlling the average group velocity in the cavity and can lead to interesting physical phenomena as well as to numerous applications. Consequently, a wide variety of methods for controlling the speed of light (primarily the group velocity) have been developed and studied, demonstrating both subluminal ( v gc) вЂЋ group velocities. This is due to the fundamental importance of this speed as well as the numerous potential applications in nonlinear optics, telecom, sensing, and more. The ability to control the speed of light has received much attention during the last several decades. В© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement 1. It is also shown that some of the latest experimental studies involving PTSSs have indirectly demonstrated such superluminal lasing. Slightly above lasing threshold, in the broken symmetry regime near the EP, the system exhibits вЂњsuperluminalвЂќ lasing вЂ“ a unique lasing condition which is highly attractive for sensing and precision metrology applications. It is shown that when the system satisfies the white light cavity (WLC) condition, corresponding to zero group index, it also forms a PT-symmetric system (PTSS) at its exceptional point (EP). We study theoretically a superluminal laser system comprising active and passive (lossy) coupled micro-resonators with equal gain/loss. Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.Use a comma to separate multiple people: J Smith, RL Jones, Macarthur.Use these formats for best results: Smith or J Smith.For best results, use the separate Authors field to search for author names.Use quotation marks ' ' around specific phrases where you want the entire phrase only.Question mark (?) - Example: 'gr?y' retrieves documents containing 'grey' or 'gray'.Asterisk ( * ) - Example: 'elect*' retrieves documents containing 'electron,' 'electronic,' and 'electricity'.Improve efficiency in your search by using wildcards.Example: (photons AND downconversion) - pump.Example: (diode OR solid-state) AND laser.Note the Boolean sign must be in upper-case.

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