Single-pumping semi-open cavity randomly-distributed feedback laser based on erbium-doped fiber

Abstract

The invention relates to a single-pumping semi-open cavity randomly-distributed feedback laser based on an erbium-doped fiber, and belongs to the technical field of fiber lasers. The laser comprises a fiber bragg grating, a pumping source, a wavelength division multiplexer, the erbium-doped fiber, a long-distance single-mode fiber and an FC / APC fiber connector. According to the laser, strong feedback is provided through the fiber bragg grating, gain amplification is provided by the erbium-doped fiber, and randomly-distributed optical feedback is provided by the long-distance single-mode fiber; when the total gain in the laser can counteract total loss, a pumping threshold value is reached, and random laser output is obtained; the power of the pumping source is continuously increased, and finally, stable laser output is obtained. The single-pumping semi-open cavity randomly-distributed feedback laser based on the erbium-doped fiber has the advantages of being low in pumping threshold value, simple in structure, low in cost and suitable for remote optical fiber sensing and the special field needing low-coherence laser light sources.

Description

technical field [0001] The invention specifically relates to a single-pumped semi-open cavity randomly distributed feedback laser based on an erbium-doped optical fiber, which belongs to the technical field of fiber lasers. Background technique [0002] As a novel miniature laser, random laser plays an irreplaceable role in many application fields. Therefore, random lasers are attracting more and more attention. In April 2010, Turitsyn et al. used intermediate bidirectional pumping and used the back Rayleigh scattering in the fiber as a feedback mechanism to successfully achieve stable laser output, and officially named it as a Randomly Distributed Feedback Laser (RDFL). It can provide incoherent, continuous laser output without mode competition, but has disadvantages such as high pump threshold power, low energy conversion efficiency and long length of single-mode fiber. In August 2011, based on Rayleigh scattering, S.A.Babin et al. realized the broadband wavelength tunab...

AI Technical Summary

Problems solved by technology

It can provide incoherent, continuous laser output without mode competition, but has disadvantages such as high pump threshold power, low energy conversion efficiency and too long length of single-mode fiber.

In August 2011, based on Rayleigh scattering, S.A.Babin et al. realized the broadband wavelength tunable output of random fiber laser, but still adopted the dual-pump excitation method

Chinese Patent Announcement No. CN102354900A, dated February 15, 2012, titled "A Randomly Distributed Feedback Fiber Laser" discloses a double-pumped fiber laser with randomly distributed feedback, while using a longer erbium-doped fiber, costing higher

Chinese Patent Announcement No. CN103378538A, dated October 30, 2013, titled "A Semi-Open Cavity Low-Threshold Random Fiber Laser" discloses a random laser realized by a single pump and semi-open cavity, but the structure is only Ordinary single-mode fiber provides Raman amplification, and lacks an efficient gain medium, which makes the working threshold of the laser higher

Images