Repetition frequency tuning method of mode-locked laser and repetition frequency tunable mode-locked laser
By using chirped fiber Bragg grating and tunable filter in mode-locking lasers to form sub-pulses of different wavelengths and refrigeration, the problem of limited repetitive frequency tuning range in the prior art is solved, and a wider frequency tuning range and structure is achieved.
CN119787072APending Publication Date: 2025-04-08NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information
- Application Number
- CN202411979069.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-04-08
AI Technical Summary
Technical Problem
The existing mode-locking lasers have limited ranges when adjusting the repetition frequency and are complex in structure, making it difficult to achieve a larger range of frequency tuning.
Method used
By introducing a chirped fiber Bragg grating and a tunable filter into the mode-locking laser, the laser pulses are made to form sub-pulses of different wavelengths and refrigeration through the chirped fiber Bragg grating, and the desired refrigeration sub-pulses are selected through the filter.
Benefits of technology
The tuning range of the repetition frequency of the mode-locking laser is greatly improved, and the structure is simple and easy to implement, and is suitable for all types of mode-locking lasers.
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Figure CN119787072A_ABST
Abstract
The invention discloses a mode-locked laser repetition frequency tuning method, and belongs to the technical field of mode-locked lasers. A laser pulse in a resonant cavity passes through a chirp fiber bragg grating and then is reflected back into the resonant cavity in different periods of the chirp fiber bragg grating to form a group of sub-pulses with different reflection wavelengths and different repetition frequencies, and then the sub-pulses with the required repetition frequencies are filtered out through a tunable filter. The invention also discloses a repetition frequency tunable mode-locked laser. On the basis of an existing mode-locked laser, dispersion broadening is carried out on laser pulses in the resonant cavity through the chirp fiber Bragg grating, the bandwidth of the reflectable Bragg wavelength is increased, and therefore the tuning range of the repetition frequency is increased; only the optical circulator, the chirp fiber Bragg grating and the tunable filter need to be added on the basis of an existing mode-locked laser, and the mode-locked laser is simple in structure, easy to implement and suitable for existing various types of mode-locked lasers.
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