Modular, high energy, widely-tunable ultrafast fiber source
First Claim
1. An optical pulse source, comprising:
- a diode-pumped passively modelocked fiber laser including a saturable absorber and generating pulses in the 1-1.15 μ
m wavelength region;
a Yb;
fiber amplifier for amplifying an output of said fiber laser; and
an output optical fiber optically connected to said passively mode locked fiber laser, and to said Yb;
fiber amplifier, said output optical fiber receiving pulses from said passively mode locked fiber laser and delivering said pulses to said Yb;
fiber amplifier.
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Abstract
A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. System compactness is ensured by employing efficient fiber amplifiers, directly or indirectly pumped by diode lasers. Dispersive broadening is introduced by dispersive pulse stretching in the presence of self-phase modulation and gain, resulting in the formation of high-power parabolic pulses. In addition, dispersive broadening is also introduced by simple fiber delay lines or chirped fiber gratings. The phase of the pulses in the dispersive delay line is controlled to quartic order by the use of fibers with varying amounts of waveguide dispersion or by controlling the chirp of the fiber gratings. After amplification, the dispersively stretched pulses can be re-compressed to nearly their bandwidth limit by the implementation of another set of dispersive delay lines. A particularly compact implementation of the whole system uses fiber oscillators in conjunction with fiber amplifiers.
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Citations
32 Claims
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1. An optical pulse source, comprising:
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a diode-pumped passively modelocked fiber laser including a saturable absorber and generating pulses in the 1-1.15 μ
m wavelength region;a Yb;
fiber amplifier for amplifying an output of said fiber laser; andan output optical fiber optically connected to said passively mode locked fiber laser, and to said Yb;
fiber amplifier, said output optical fiber receiving pulses from said passively mode locked fiber laser and delivering said pulses to said Yb;
fiber amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An optical pulse source, comprising:
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a diode-pumped passively modelocked fiber laser generating pulses in the 1-1.15 μ
m wavelength region, said laser comprising a gain fiber, a saturable absorber disposed near a first end of said fiber laser and operable to initiate modelocking, wherein said passively modelocked laser is arranged such that a pulse bandwidth within said passively modelocked fiber laser is substantially smaller than a gain bandwidth of Yb;a Yb;
fiber amplifier for non-linear amplification of an output of said fiber laser. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An optical pulse source comprising:
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a diode-pumped passively modelocked fiber laser generating pulses in the 1-1.15 μ
m wavelength region;a large gain, non-linear Yb;
fiber amplifier for amplifying an output of said fiber laser; andan optical fiber configured to receive pulses from said non-linear amplifier, wherein said non-linear amplifier and said optical fiber are arranged in such a way that an output of said non-linear amplifier is subjected to large amounts of self-phase modulation and spectral broadening. - View Dependent Claims (19, 20, 21, 22)
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23. An optical pulse source comprising:
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a diode-pumped passively modelocked fiber laser including a saturable absorber and generating femtosecond pulses in the 1-1.15 μ
m wavelength region;a Yb;
fiber amplifier for amplifying an output of said fiber laser; andan optical modulator disposed between said passively modelocked fiber laser and said Yb;
amplifier, said modulator being controllable to reduce the repetition rate of pulses emitted from said modelocked fiber laser, to increase the available pulse energy of pulses amplified with said Yb;
amplifier, and to provide for selection of pulses for amplification with said Yb;
amplifier. - View Dependent Claims (24, 25, 26)
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27. An optical pulse source comprising,
a seed laser comprising a passively modelocked fiber laser; -
a Yb;
fiber amplifier for amplifying pulses generated by said seed laser, said fiber amplifier generating amplified pulses;an optical fiber configured to receive said amplified pulses, said optical fiber subjecting said received and amplified pulses to large levels of self-phase modulation that broadens the pulse width of said received and amplified pulses. - View Dependent Claims (28, 31)
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29. A laser system comprising:
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a fiber laser seed source generating pulses in the 1-1.15 um wavelength region which have a spectral bandwidth larger than 0.3 nm and a pulse width between 50 fs and 1 ns; a frequency-shifting fiber which inputs an output of said fiber laser and outputs an anti-Stokes, blue-shifted output. - View Dependent Claims (30)
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32. An optical pulse source comprising:
a seed source generating output pulses in the range of 1-1.15 μ
m;a large gain Yb;
non-linear fiber amplifier having a core diameter in the range from about 1 μ
m to 50 μ
m, said amplifier configured in such a way that the fundamental mode is excited and propagates in said Yb;
amplifier, said Yb;
amplifier generating parabolic amplified pulses.
Specification