A tunable optical micro-cavity Raman laser and a tunable optical micro-cavity doped laser

Abstract

The invention relates to the field of lasers and specifically relates to a tunable optical micro-cavity Raman laser and a tunable optical micro-cavity doped laser. The tunable optical micro-cavity Raman laser comprises a first pump source, an optical micro-cavity, a coupling device and a temperature control apparatus. The first pump source and the optical micro-cavity are connected via the coupling device, and the optical micro-cavity is in a temperature control scope of the temperature control apparatus. The tunable optical micro-cavity doped laser comprises a second pump source generating 980nm or 1480nm pump light, a doped optical micro-cavity, a coupling device, a wavelength division multiplexer and a temperature control apparatus. The second pump source, the doped optical micro-cavity and the wavelength division multiplexer are connected through the coupling device, and the doped optical micro-cavity is in the temperature control scope of the temperature control apparatus. According to the invention, the structure is simple; the size is small; the Q-value is high; and subsequent integration application is provided with convenience. Tuning of wavelengths of emitting laser is realized through controlling of the temperature of the micro-cavity. The tuning mechanism is simple, convenient and efficient.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a tunable optical microcavity Raman laser and a tunable optical microcavity doping laser. Background technique [0002] Tunable fiber lasers are key components of modern fiber optic communication systems. They have natural compatibility with optical fibers and high-quality beam quality. They are also commonly used in the fields of medicine, fiber optic sensing and spectral analysis. With the increase of communication capacity and the development of optical fiber manufacturing technology, tunable fiber laser has been paid more and more attention and gradually applied. However, in practical applications, it is found that various types of tunable fiber lasers currently on the market have some insurmountable problems. [0003] The structure of the existing tunable Raman fiber laser mainly includes a pump source, a resonator, a gain medium and an acousto-optic tunable filter. Generally, a grati...

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Problems solved by technology

The problems of the tunable Raman fiber laser with this structure are: (1) use a long fiber as the nonlinear gain medium, and the volume is relatively large; (2) the resonator adopts multiple pairs of fiber Bragg gratings (FBG) Form, the conventional FBG reflection bandwidth is narrow, which limits the conversion efficiency of the laser; (3) It cannot be well integrated with the chip of the communication system, and cannot be developed and applied on a large scale; (4) The Q value is low, and the laser The conversion efficiency is low, the threshold is high, and the relative intensity noise is high; (5) The tuning mechanism of the laser usually adopts the form of filter tuning and thermal tuning. Filter tuning requires the introduction of additional optical devices, which increases the complexity of the system degree and insertion loss, which increases the cost of the laser; for thermal tuning, a large area of ​​heating is required, and the heating efficiency is low

The problems of the tunable doped fiber laser with this structure are: (1) the long fiber is used as the gain medium, and the volume is relatively large, which limits its application in occasions with special requirements for size, and the application is inconvenient; (2) ) cannot be well integrated with the chips of modern communication systems, and it is difficult to develop and apply large-scale integration; (3) the Q value is low, the conversion efficiency of the laser is low, and the threshold is high; (4) the tuning mechanism of the laser is multiple Fiber Bragg grating tuning, thermal tuning, fiber loop mirror tuning and filter tuning are used, among which fiber Bragg grating tuning is limited by the temperature and strain response sensitivity of the bare fiber Bragg grating, and the tuning range is very narrow; for thermal tuning, it is necessary to use Large-area heating, heating efficiency is low; fiber optic loop mirror tuning and filter tuning require the introduction of additional optical devices, which increases the complexity of the system and insertion loss, and increases the cost of the laser; the tuning mechanisms of the above-mentioned methods all exist Defects, and not suitable for the miniaturization and integration of optical devices in modern optical fiber communication systems

With the continuous development of optical microcavity technology, its application in the field of lasers is also becoming more and more extensive, such as Raman lasers based on optical microcavities and doped lasers based on optical microcavities, but about tunable optical microcavity lasers However, the research is almost at a blank stage, and no relevant technical information has been found yet.

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