Flexibly controllable multi-pulse mode-locked MOPA Yb-doped fiber laser in all normal dispersion regime

Chenxi Bu; Chinhua Wang

doi:10.1117/12.2034681

17 September 2013 Flexibly controllable multi-pulse mode-locked MOPA Yb-doped fiber laser in all normal dispersion regime

Chenxi Bu, Chinhua Wang

Author Affiliations +

Proceedings Volume 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications; 89041D (2013) https://doi.org/10.1117/12.2034681
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

A Controllable, high energy, all normal dispersion (ANDi), passively mode-locked Yb-doped fiber laser is demonstrated with a Master Oscillator Power-Amplifier (MOPA) structure. The mode-locking is achieved by nonlinear polarization evolution (NPE). different types of laser pulse are achieved from fundamental mode-locked (FML) single pulse to twin pulse and then to harmonically mode-locked (HML) pulses (the maximum order is 7 times) by adjusting quarter-wave plates (QWPS) and a half-wave plate (HWP) in our system. Using a cascaded long-period fiber grating as the spectral filter, the center wavelength of our laser is fixed at 1034nm.The repetition frequency rate of the FML pulse is 1.53MHz with a pulse width of 817ps. The maximum average energy is 450 mW and the maximum pulse energy of FML single pulse is 294 nJ. Besides, the 517nm green laser output is also achieved by using a LiB₃O⁵ (LBO) crystal as the frequency doubling crystal. The maximum average of the green pulse is 4.71mW.

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Chenxi Bu and Chinhua Wang "Flexibly controllable multi-pulse mode-locked MOPA Yb-doped fiber laser in all normal dispersion regime", Proc. SPIE 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications, 89041D (17 September 2013); https://doi.org/10.1117/12.2034681

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KEYWORDS

Fiber lasers

Mode locking

Pulsed laser operation

Dispersion

Collimators

Crystals

Optical filters

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