Nonlinear Chirped Pulse Fiber Amplifier With Pulse Compression
First Claim
1. A method for generating high power ultrashort-pulses using a chirped pulse fiber amplifier, comprising the steps of:
- chirping an input pulse to be amplified, thereby creating a chirped pulse that is broadened in time;
modifying said chirped pulse by increasing the power of said pulse with a fiber amplifier to induce a nonlinear phase shift in said pulse which substantiality changes a shape of a power spectrum of said pulse; and
dechirping said pulse to generate a narrowed output pulse.
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Abstract
A chirped-pulse fiber amplification method and system operates with large nonlinear phase shifts (as large as ˜20π or more). In this regime, the pulse spectrum is modified by strong self-phase modulation and gain shaping. With large-enough nonlinear phase shift, substantial spectral broadening occurs. The amplified spectrum can therefore be much broader than the spectrum that is obtained with small nonlinear phase shifts. The broader spectrum enables the formation of a shorter pulse, and the bandwidth generated in nonlinear chirped-pulse amplification can in fact be exploited to generate shorter pulses. Ultimately, this allows the generation of pulses shorter than the gain-narrowing limit of a fiber amplifier.
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Citations
13 Claims
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1. A method for generating high power ultrashort-pulses using a chirped pulse fiber amplifier, comprising the steps of:
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chirping an input pulse to be amplified, thereby creating a chirped pulse that is broadened in time; modifying said chirped pulse by increasing the power of said pulse with a fiber amplifier to induce a nonlinear phase shift in said pulse which substantiality changes a shape of a power spectrum of said pulse; and dechirping said pulse to generate a narrowed output pulse. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A chirped pulse fiber amplifier system for generating high power ultrashort-pulses comprising:
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a pulse stretcher for chirping an input pulse to be compressed, thereby creating a chirped pulse that is broadened in time; a fiber amplifier for modifying said chirped pulse by increasing the power of said pulse, said amplifier having a gain that is selected to induce a nonlinear phase shift in said pulse which substantiality changes a shape of a power spectrum of said pulse; and a compressor for dechirping said pulse to generate a narrowed output pulse. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification