High-performance coherent light sources are one of the key prerequisites for basic photophysics research and integrated photonics applications. In recent years. the acoustic wall mode optical microcavity with ultra-high quality factors has become an important platform for studying various new and efficient light sources. Experimentally, it has obtained parity-time inversion symmetrical laser pointer, orbital angular momentum laser, and microcavity. Optical frequency comb and so on. However, the inherent chiral symmetry of the echocavity microcavity mode causes the laser field in the cavity to be transmitted with equal intensity, which seriously hinders the development of many photonic device applications, such as unidirectional light emission, all-optical registers, and non-interactive Easy light transmission, etc. So far, to obtain a chiral laser with unidirectional echo wall microcavity, it is usually necessary to directly break the geometric chiral symmetry of the optical resonator. The directivity of the laser obtained by this method is fixed. and it is difficult to dynamically adjust its emission properties. and it has high requirements on the shape design and process preparation of the resonant cavity.
In the previous work, the research group proposed and proved the concept of spontaneous symmetry breaking of the microcavity light field for the first time, and it was verified by international colleagues. In the latest work, the research group introduced this concept into the gain microcavity, and realized the chiral Raman green laser pointer with spontaneous symmetry breaking. Experimentally, researchers first obtained low-threshold Raman lasers in a completely symmetrical echo wall microcavity system. There are two coupling mechanisms between oppositely transmitted Raman lasers in a microcavity: linear coupling caused by surface scattering and nonlinear coupling caused by Kerr cross-phase modulation. When the intensity of the Raman laser field that meets a specific phase reaches the breaking threshold, the nonlinear coupling completely compensates for the linear coupling; at this time, the chiral symmetry state of the Raman laser field is destabilized, and the light field will randomly enter clockwise or Chiral state of anti-clockwise unidirectional transmission; experimentally, the ratio of laser intensity in both directions exceeds 160: 1. The researchers further controlled the directionality of the spontaneous chiral Laser Engraver by controlling the ratio of the intensity of the bidirectional pumping light in the experiment. The nano-needle-point scatterer was used to change the linear coupling intensity of the light field to adjust the symmetry breaking threshold. Switching between bidirectional and bidirectional transmission. This spontaneous symmetric breaking laser combines both the laser gain dynamics and the spontaneous symmetric breaking mechanism, and provides a new scheme for a microcavity coherent light source with reconfigurable directions. In addition. this mechanism does not rely on the specific shape design of the cavity. which can be further extended to other materials and different laser processes.
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