Cascaded Raman fiber laser in Fourier domain mode lock operation

Barry Vuong; Mark K. Harduar; Kyle H. Y. Cheng; Xijia Gu; Lawrence R. Chen; Beau A. Standish; Victor X. D. Yang

doi:10.1117/12.842769

17 February 2010 Cascaded Raman fiber laser in Fourier domain mode lock operation

Barry Vuong, Mark K. Harduar, Kyle H. Y. Cheng, Xijia Gu, Lawrence R. Chen, Beau A. Standish, Victor X. D. Yang

Proceedings Volume 7580, Fiber Lasers VII: Technology, Systems, and Applications; 75802R (2010) https://doi.org/10.1117/12.842769
Event: SPIE LASE, 2010, San Francisco, California, United States

Abstract

In this study, a cascaded Raman fiber laser in Fourier domain mode lock operation (FDML) is presented. This laser utilizes a Ytterbium doped twin core pump laser source at 1109 nm. The pump light is directed to a cascaded Raman cavity, which consists of multiple cascaded fiber Bragg grating pairs and 3.86 km of dispersion compensation fiber, which provides Raman gain. The output wavelength of a cascaded Raman laser is determined by the Stoke's shift (≈ 60 to 70 nm in optical fiber) and the pump laser wavelength. The power build up in the cascaded Raman cavity and shift to higher Stoke's orders produce multiple spectral peaks. At higher Stoke's orders, the overlapping Raman peaks create broad bandwidth gain with relatively large gain ripples. FDML operation using a polygon-based tunable filter helps to suppress the ripples. The overall laser in linear operation has a bandwidth of 316 nm with a center wavelength of 1445 nm. An output optical power was measured to be (> 10 mW). On the other hand, the sweeping bandwidth was 35 nm with an output power in the micro-watt range. The utilization of broadband tunable lasers are important in applications such as swept-source optical coherence tomography for use in biomedical imaging.

Citation Download Citation

Barry Vuong, Mark K. Harduar, Kyle H. Y. Cheng, Xijia Gu, Lawrence R. Chen, Beau A. Standish, and Victor X. D. Yang "Cascaded Raman fiber laser in Fourier domain mode lock operation", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75802R (17 February 2010); https://doi.org/10.1117/12.842769

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