Ultrashort-Pulse Fiber Laser with a Dispersion-Managed Cavity
Patent Application, Filed 5 May 2000
DEPARTMENT OF THE NAVY WASHINGTON DC
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The ultrashort fiber laser with a dispersion-managed cavity. The laser is an actively mode-locked sigma laser, typically locked at a repetition rate of 10 GHz, driven by an external frequency source and actively length stabilized, and nearly 10,000 pulses circulate within the laser cavity. A Mach-Zehnder modulator is placed in a loop of polarization-maintaining PM fiber. The polarization state of light injected into the non-PM branch evolves in a random manner but is transformed into an orthogonal state by a Faraday mirror linearly polarized light injected into the branch by a polarizing beamsplitter returns to the beamsplitter also linearly polarized but rotated by 900. The cavity of the laser is composed of several fibers. The average dispersion D sub av is anomalous and is approximately equal to 0.1 psnm-km. The measured noise in the output of the laser is very low the rms amplitude noise is less than 0.1 percent over a frequency range of 10 Hz - 1 MHz, and the rms timing filter is 25 less than 10 femtoseconds over a frequency range of 100 Hz - 1 MHz.
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