FILAMENT-BASED STIMULATED RAMAN DETECTION
First Claim
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1. A method of Raman spectroscopy in air, comprising:
- exciting a target region by a laser pump pulse exceeding the critical power for self-focusing in air and having a duration after self-focusing of 15 fs or less and;
directing at the excited target region a laser probe pulse having a duration in the range of 200 fs to 100 ps and an energy of at least 20 μ
J;
detecting stimulated Raman scattering from the interaction between the excited target region and the laser probe pulse.
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Abstract
In apparatus and methods of Raman spectroscopy in air, a target region is excited by a laser pump pulse exceeding the critical power for self-focusing in air and having a duration after self-focusing of 15 fs or less. A laser probe pulse having a duration in the range of 200 fs to 100 ps and an energy of at least 20 μJ is directed at the excited target region. Stimulated Raman scattering from the interaction between the excited target region and the laser probe pulse is detected. The target region can be outside the spectrometer, with ambient air in between used for the self-focusing.
9 Citations
17 Claims
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1. A method of Raman spectroscopy in air, comprising:
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exciting a target region by a laser pump pulse exceeding the critical power for self-focusing in air and having a duration after self-focusing of 15 fs or less and; directing at the excited target region a laser probe pulse having a duration in the range of 200 fs to 100 ps and an energy of at least 20 μ
J;detecting stimulated Raman scattering from the interaction between the excited target region and the laser probe pulse. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of Raman spectroscopy in air, comprising:
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exciting a target region external to an apparatus by directing from said apparatus to said target region a laser pump pulse exceeding the critical power for self-focusing in air and having a duration after self-focusing of 15 fs or less; directing at the excited target region from said apparatus a laser probe pulse having a duration in the range of 200 fs to 100 ps and an energy sufficient to excite stimulated Raman scattering; and detecting at said apparatus a backscattered stimulated Raman signal from the interaction between the excited target region and the laser probe pulse. - View Dependent Claims (8, 9, 10)
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11. A Raman spectrometer comprising:
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a pump laser operative to direct through ambient air to a target region a laser pump pulse exceeding the critical power for self-focusing in air and having a duration after self-focusing of 15 fs or less; a probe laser operative to direct at the target region a laser probe pulse having a duration in the range of 200 fs to 100 ps and an energy of at least 20 μ
J;a detector operative to detect stimulated Raman scattering from the interaction between the excited target region and the laser probe pulse; and a driver operative to trigger pulses from said pump laser and then said probe laser at a time delay such that said probe laser probes said target region while said target region is excited from said pump pulse. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification