Low repetition rate passively mode-locked thulium-doped fiber laser for LIDAR system

An all-fiber passively mode-locked thulium-doped fiber (TDF) ring laser with a repetition rate of 736 kHz was demonstrated. This is the lowest repetition rate among those of mode-locked TDF lasers to the best of our knowledge. Numerical calculations to find the best solution for successful mode-lock...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-08, Vol.1065 (3), p.32006
Main Authors: Gene, J H, Lim, S D, Kim, S K
Format: Article
Language:English
Subjects:
Doped fibers
Fiber lasers
Lasers
Mode locking
Physics
Repetition
Ring lasers
Thulium
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Summary:An all-fiber passively mode-locked thulium-doped fiber (TDF) ring laser with a repetition rate of 736 kHz was demonstrated. This is the lowest repetition rate among those of mode-locked TDF lasers to the best of our knowledge. Numerical calculations to find the best solution for successful mode-locking in a highly lossy oscillator were made based on Haus's master equation with variables such as oscillator loss, small signal gain and modulation depth. Based on the calculation, the laser was configured, where nonlinear polarization rotation (NPR) and two stages of TDF amplifier were properly applied. The overall length of oscillator is about 290 m. The output optical spectrum has a FWHM of 28 nm at 2 μm.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1065/3/032006