High-performance single-polarization optical fibers

Li, M.-J.; Nolan, Daniel A.; Berkey, G.E.; Chen, X.; Koh, Joohyun; Walton, Donnell T.; Wang, J.; Wood, William A.; Zenteno, L.A.

doi:10.1117/12.580336

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…Despite its success in achieving a high output power of 405 W, its 1.9 nm linewidth is too broad for SHG. Li et al reported a high power fiber laser using a single-polarization fiber from Corning for polarization selection and achieved 17-20 dB of PER [88]. Nevertheless, the lasers reported in [87,88] used dichroic mirrors to separate pump and lasing wavelengths and bulk optics to couple the light in and out of the gain fiber.…”

Section: Introductionmentioning

confidence: 99%

High Power Linearly Polarized Fiber Lasers in a Linear Cavity

Eldamak¹

2021

Preprint

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This thesis presents two designs for high power linearly polarized all-fiber linear cavity lasers, continuous wave (CW) and mode-locked. The cavity designs use Polarization Maintaining (PM) fibers for both gain medium and Fiber Bragg Gratings (FBGs). The FBG pairs select lasing wavelength and polarization. The fiber lasers incorporating specialty designed FBGs achieve an extinction ratio larger than 23 dB. Firstly, an all-fiber linear cavity design of a high power picoseconds mode-locked laser is introduced. The proposed configuration is based on Non-Linear Polarization (NPR) using PM Yb-doped active fiber and two matching FBGs to form the laser cavity. The combination of nonlinearity, gain and birefringence in cavity made the laser generate mode-locked pulses in picoseconds range and with high average output power. The output mode-locked pulses amplitude is modulated with an envelope whose mechanism is also investigated in this thesis project. Experimental data and numerical simulations of the self mode-locking fiber laser are presented. Main parameters affecting mode-locked pulses and its envelope are identified. In addition, a new theoretical model based on Nonlinear Schrödinger Equation (NLSE) is developed and implemented on the MATLAB platform. The model explains the self mode-locking mechanism and the source of the pulse envelope. In this model, it is proven that self phase modulation (SPM) plays an essential role in pulse formation and shaping. The theoretical model and experimental results are in a very good agreement at different pumping levels. A method of regulating the mode-locked pulses is presented. This is achieved by applying a pulsed current to pump diode. This method successfully stabilizes the mode-locked pulses underneath a Q-switched pulse envelope. Further scale-up of average power and pulse energy is realized by adding an amplifier stage. Secondly, a CW dual-wavelength all-fiber laser is presented. The laser consists of two pairs of FBGs and a PM Er/Yb co-doped fiber as a gain medium. The laser emits at both 1 μm and 1.5 μm wavelengths simultaneously with a stable output. This laser provides a compact fiber-based pumping source that is suitable for mid-IR generation.

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Section: Introductionmentioning

confidence: 99%

High Power Linearly Polarized Fiber Lasers in a Linear Cavity

Eldamak¹

2021

Preprint

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“…Despite its success in achieving a high output power of 405 W, its 1.9-nm linewidth is too broad for SHG. Li et al reported a high power fiber laser using a single-polarization fiber from Corning for polarization selection and achieved 17-20 dB of PER [2]. Nevertheless, the lasers reported in [1] and [2] used dichroic mirrors to separate pump and lasing wavelengths and bulk optics to couple the light in and out of the gain fiber.…”

Section: Introductionmentioning

confidence: 99%

Dual-Wavelength, Linearly Polarized All-Fiber Laser With High Extinction Ratio

et al. 2013

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We demonstrate a dual-wavelength linearly polarized all-fiber laser emitting 1-m and 1.5-m wavelengths with a total output power of 1.3 W. The laser consists of two pairs of fiber Bragg gratings (FBGs) fabricated on PM fibers to form a cavity and an Er/Yb codoped fiber as a gain medium. A high extinction ratio of 23 dB is achieved using specially designed PM FBGs. The laser output has a narrow bandwidth of 26 pm at both 1057 and 1554 nm. When the dual-wavelength all-fiber laser is used to pump a PPLN crystal, the generation of mid-infrared emission at 3.3 m is successfully demonstrated.

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“…Fibers that guide only one polarization, single polarization fibers (SPF) [1][2][3][4][5][6][7][8][9][10], are useful as polarizing elements, in high power fiber lasers, fiber optic gyroscopes, current sensors, and super luminescent sources. They also could find application as interconnecting fibers in the assembly of electro-optic devices.…”

Section: Introductionmentioning

confidence: 99%