Chirped-pulse amplifier using photonic-crystal-rod (PCR) waveguides and associated method
First Claim
1. An apparatus comprising:
- a first photonic-crystal rod (PCR), having rare-earth-doped core with a diameter of at least 50 microns and an external diameter of at least 1 mm such that the rod is therefore thick enough to substantially hold its shape when released, wherein the rare-earth-doped photonic-crystal rod (REDPCR) receives, as signal input, spectrally broad chirped optical pulses having a FWHM spectral linewidth of at least 10 nm and a duration of ins of less, and amplifies the pulses to obtain an output pulse energy of at least 0.5 mJ, peak power of at least 1 megawatt (MW), and beam-quality M2 value of less than 1.5.
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Abstract
A method and apparatus use a photonic-crystal fiber having a very large core while maintaining a single transverse mode. In some fiber lasers and amplifiers having large cores problems exist related to energy being generated at multiple-modes (i.e., polygamy), and of mode hopping (i.e., promiscuity) due to limited control of energy levels and fluctuations. The problems of multiple-modes and mode hopping result from the use of large-diameter waveguides, and are addressed by the invention. This is especially true in lasers using large amounts of energy (i.e., lasers in the one-megawatt or more range). By using multiple small waveguides in parallel, large amounts of energy can be passed through a laser, but with better control such that the aforementioned problems can be reduced. An additional advantage is that the polarization of the light can be maintained better than by using a single fiber core.
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Citations
22 Claims
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1. An apparatus comprising:
a first photonic-crystal rod (PCR), having rare-earth-doped core with a diameter of at least 50 microns and an external diameter of at least 1 mm such that the rod is therefore thick enough to substantially hold its shape when released, wherein the rare-earth-doped photonic-crystal rod (REDPCR) receives, as signal input, spectrally broad chirped optical pulses having a FWHM spectral linewidth of at least 10 nm and a duration of ins of less, and amplifies the pulses to obtain an output pulse energy of at least 0.5 mJ, peak power of at least 1 megawatt (MW), and beam-quality M2 value of less than 1.5. - View Dependent Claims (2, 3, 4, 5, 6, 7, 22)
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8. A method comprising:
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providing a first photonic-crystal rod (PCR) having rare-earth-doped core with a diameter of at least 50 microns and an external diameter of at least 1 mm such that the rod is therefore thick enough to substantially hold its shape when released; optically coupling as signal input into the rare-earth-doped photonic-crystal rod (REDPCR) spectrally broad chirped optical pulses having a FWHM spectral linewidth of at least 10 nm and a duration of 1 ns of less; and amplifying the pulses in the REDPCR to obtain an output pulse energy of at least 0.5 mJ, peak power of at least 1 MW, and beam-quality M2 value of less than 1.5. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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photonic-crystal-rod means for amplifying, the means for amplifying having rare-earth-doped means for waveguiding with a diameter of at least 50 microns and means for substantially holding the shape of the means for amplifying when released; means for optically coupling as signal input into the rare-earth-doped photonic-crystal rod (REDPCR) spectrally broad chirped optical pulses having a FWHM spectral linewidth of at least 10 nm and a duration of ins of less; and means for pumping the means for amplifying in order to obtain an output pulse energy of at least 0.5 mJ, peak power of at least 1 MW, and beam-quality M2 value of less than 1.5. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification