Optical scanning and imaging systems based on dual pulsed laser systems
First Claim
1. A system for imaging in the THz spectral range comprising:
- a coherent dual scanning laser system (CDSL) comprising two passively modelocked fiber oscillators, said modelocked oscillators configured to operate at slightly different repetition rates, such that a difference δ
fr in repetition rates is small compared to the values fr1 and fr2 of the repetition rates of said oscillators;
a feedback system for stabilizing the difference in the repetition rates of the two oscillators, wherein information generated by said feedback system is used to generate a frequency grid in the RF domain that has a 1;
1 correspondence to a frequency grid in the THz domain, and allowing an RF frequency to be scale to a THz frequency;
a material emitting THz radiation in response to an output of said CDSL; and
a detector responsive to said THz radiation.
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Abstract
The invention relates to scanning pulsed laser systems for optical imaging. Coherent dual scanning laser systems (CDSL) are disclosed and some applications thereof. Various alternatives for implementation are illustrated, including highly integrated configurations. In at least one embodiment a coherent dual scanning laser system (CDSL) includes two passively modelocked fiber oscillators. The oscillators are configured to operate at slightly different repetition rates, such that a difference δfr in repetition rates is small compared to the values fr1 and fr2 of the repetition rates of the oscillators. The CDSL system also includes a non-linear frequency conversion section optically connected to each oscillator. The section includes a non-linear optical element generating a frequency converted spectral output having a spectral bandwidth and a frequency comb comprising harmonics of the oscillator repetition rates. A CDSL may be arranged in an imaging system for one or more of optical imaging, microscopy, micro-spectroscopy and/or THz imaging.
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Citations
2 Claims
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1. A system for imaging in the THz spectral range comprising:
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a coherent dual scanning laser system (CDSL) comprising two passively modelocked fiber oscillators, said modelocked oscillators configured to operate at slightly different repetition rates, such that a difference δ
fr in repetition rates is small compared to the values fr1 and fr2 of the repetition rates of said oscillators;a feedback system for stabilizing the difference in the repetition rates of the two oscillators, wherein information generated by said feedback system is used to generate a frequency grid in the RF domain that has a 1;
1 correspondence to a frequency grid in the THz domain, and allowing an RF frequency to be scale to a THz frequency;a material emitting THz radiation in response to an output of said CDSL; and a detector responsive to said THz radiation.
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2. A system for imaging in the THz spectral range comprising:
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a coherent dual scanning laser system (CDSL) comprising two passively modelocked fiber oscillators, said modelocked oscillators configured to operate at slightly different repetition rates, such that a difference δ
fr in repetition rates is small compared to the values fr1 and fr2 of the repetition rates of said oscillators;a monitoring system for monitoring the difference in the repetition rates of the two oscillators, wherein information generated by said monitoring system is used to generate a frequency grid in the RF domain that has a 1;
1 correspondence to a frequency grid in the THz domain, and allowing an RF frequency to be scale to a THz frequency;a material emitting THz radiation in response to an output of said CDSL; and a detector responsive to said THz radiation.
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Specification