Optical fiber laser based on frequency pulling effect

Abstract

The invention relates to an optical fiber laser based on frequency pulling effect, belonging to the technical field of laser. The optical fiber laser comprises a single-frequency tunable light source, an optical fiber amplifier, an optical resonant cavity and an optical fiber drawing device, wherein the single-frequency tunable light source and the optical fiber amplifier are connected to transmit single-frequency laser signals; the optical fiber amplifier and an input port of the optical resonant cavity are connected to transmit the amplified single-frequency laser signals; and single-mode optical fiber in the optical resonant cavity is uniformly wound in the optical fiber drawing device and the two ends of the single-mode optical fiber are fixed at the two ends of the optical fiber drawing device. In the optical fiber laser, tunable stress is applied to the optical fiber which is used as Brillouin gain medium in a Brillouin optical fiber laser, so that the Brillouin frequency shift and the Brillouin gain curve of the optical fiber are changed, further the laser frequency is finely tuned by frequency pulling effect, and the optical fiber laser with finely tunable wideband and frequency is realized in combination with wideband tuning capability of a pump light source. The optical fiber laser has the advantages that the structure is simple and the cost is low.

Description

technical field [0001] The invention relates to a device in the field of laser technology, in particular to a broadband, finely adjustable frequency fiber laser based on the frequency pulling effect. Background technique [0002] Broadband and finely tunable single-frequency lasers have a wide range of applications, such as optical coherent image technology, sensing systems, high-precision spectrum analysis, and dense wavelength division multiplexing systems. In all these application fields, the tuning capability of lasers such as adjustable range, tuning speed, and especially tuning accuracy are the key technologies. At this stage, the adjustable range of single-frequency lasers has reached the order of hundreds of nanometers (nm), and the tuning speed can also reach the order of tens of nanoseconds (ns), which can basically meet the application requirements. However, it is difficult to further improve the tuning accuracy of the laser. The reason why the tuning accuracy i...

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Problems solved by technology

The article only theoretically expounds the possibility of the frequency pulling effect to achieve fine tuning of the frequency of the free electron laser (FEL), without demonstrating it experimentally

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