Self-pulsed fiber Raman master oscillator power amplifiers

Yan Feng; Ken-ichi Ueda

doi:10.1364/OPEX.13.002611

Optics Express
Vol. 13,
Issue 7,
pp. 2611-2616
(2005)
•https://doi.org/10.1364/OPEX.13.002611

Self-pulsed fiber Raman master oscillator power amplifiers

Yan Feng and Ken-ichi Ueda

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Yan Feng and Ken-ichi Ueda, "Self-pulsed fiber Raman master oscillator power amplifiers," Opt. Express 13, 2611-2616 (2005)

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Abstract

We report self-pulsed operation of fiber Raman master oscillator power amplifiers, in which the amplifier and oscillator are pumped by one pump source successively. The pulse period is one or half of the round-trip time of the oscillator, depending on the optical length of the amplifier. A simple model is constructed to explain the observations qualitatively.

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Fig. 1. Schematic of experimental setup. FBG1 is a partially reflective fiber Bragg grating (15%, 30%, 50%), and FBG2 is a highly reflective (99%) fiber Bragg grating.

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Fig. 2. Waveforms of laser output at pump power of a) 13.8W, b) 6.7W, and c) 4.5W, respectively. The fiber used in the amplifier is a 320m phosphosilicate, in the oscillator an 890m HI1060 fiber, and the reflectivity of FBG1 is 15%.

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Fig. 3. Waveforms of laser output in three configurations with pump power near 11W (the curves are offsetted for clear presentation). From top to bottom, a) the fiber used in the amplifier is a 710m phosphosilicate fiber, in the oscillator an 890m HI1060 fiber, and the reflectivity of FBG1 is 15%; b) in the amplifier a 320m phosphosilicate fiber, in the oscillator an 890m HI1060 fiber, and FBG1 15%; c) in the amplifier an 890m HI1060 fiber, in the oscillator a 320m phosphosilicate fiber, and FBG1 30%.

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Fig. 4. top) calculated waveforms for two configurations at pump power of 12W: the reflectivity of FBG1 is 15%, in oscillator an 890m HI1060 fiber, in amplifier (I) 320m and (II) 710m phosphosilicate fiber, respectively, which correspond to the experimental configurations; bottom) calculated waveforms for the configuration (I) at pump power of 1) 6W, 2) 12W, and 3) 18W, respectively.

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Fig. 5. the laser output power as a function of pump power for three configurations with different reflectivity of FBG1, R1, length of phosphosilicate fiber in amplifier, La, and same fiber in oscillator, which is an 890m HI1060 fiber.

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Equations (10)

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\frac{\partial P}{\partial z} + \frac{1}{v} \frac{\partial P}{\partial t} = - g_{r} \frac{υ_{p}}{υ_{R}} P (I^{+} + I^{-} + 2 h υ_{P} B) - α_{P} P

\frac{\partial I^{+}}{\partial z} + \frac{1}{ν} \frac{\partial I^{+}}{\partial t} = g_{r} P (I^{+} + h υ_{R} B) - α_{R} I^{+}

\frac{\partial I^{-}}{\partial z} - \frac{1}{v} \frac{\partial I^{-}}{\partial t} = - g_{r} P (I^{-} + h υ_{R} B) + α_{R} I^{-},

P (0) = P_{0}

I^{+} (0) = 0

I_{l}^{-} (L a) = I_{r}^{-} (L a) \cdot (1 - R_{1}) + I_{l}^{+} (L a) \cdot R_{1}

I_{r}^{+} (L a) = I_{r}^{-} (L a) \cdot R_{1} + I_{l}^{+} (L a) \cdot (1 - R_{1})

I^{-} (L a + L) = I^{+} (L a + L) \cdot R_{2}

I^{+} (z, t) = \sum_{m = 0}^{\infty} C_{I^{+} m} (z) \cos (m k (z - v t) + ϕ_{I^{+} m})

I^{-} (z, t) = \sum_{m = 0}^{\infty} C_{I^{-} m} (z) \cos (m k (z + v t) + ϕ_{I^{-} m}) .

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Equations (10)

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