Method and system for non-interferometric quantum photonics vibrometry
Approaches, apparatuses and methods for single photon sensitive, non-interferometric photonics vibrometry applications based on quantum parametric mode sorting, optical gating and single photon counting are disclosed. In one embodiment, a controller module includes a photon detection unit, a pulse generator unit, a time synchronization unit, a data acquisition and processing unit and a central controller unit. In the second embodiment, a probe module with beam raster scanning ability includes an optical transceiver unit based on a bidirectional monostatic coaxial arrangement using off-the-shelf optical components and an optical beam steering device.
1 . A method for remote vibration and acoustic measurement, comprising the steps of:
creating a probe signal;
creating a pump optical pulse;
collimating said probe signal;
transmitting said probe signal to a target;
receiving a backscattered signal from said target;
temporally aligning said pump optical pulse with said backscattered signal;
upconverting said backscattered signal to obtain a frequency upconverted backscattered signal;
performing picosecond time gating detection and quantum parametric mode selection on said frequency upconverted backscattered signal to obtain photon counting data; and
obtaining vibration and/or acoustic measurement data from said photon counting data.
2 . The method of claim 1 , wherein said probe signal and said pump optical pulse have frequencies between the ultraviolet and infrared bands.
3 . The method of claim 1 , wherein said photon counting data is single-photon sensitive.
4 . The method of claim 1 , wherein said upconverting step involves the step of converting only photons in a single spatial-temporal mode similar to a shape of said pump optical pulse.
5 . The method of claim 4 , wherein background noise photons in all other modes other than said single spatial-temporal mode are rejected.
6 . The method of claim 1 , wherein said pump optical pulse and said probe signal are created using an optical pulse generator.
7 . The method of claim 6 , wherein said optical pulse generator comprises at least one element selected group the group consisting of: a femtosecond mode locked fiber laser; a synchronized electro-opto pulse generator; and a synchronized picosecond mode locked fiber laser.
8 . The method of claim 6 , wherein said optical pulse generator further comprises an optical frequency comb and a femtosecond mode locked fiber laser.
9 . The method of claim 6 , wherein said optical pulse generator comprises one or more electro-optic pulse generators adapted to synchronize said probe signal with said pump optical pulse.
10 . The method of claim 1 , wherein said transmitting step is performed using an optical transceiver.
11 . The method of claim 10 , wherein said transceiver is integrated as free space optics or fiber, or as an integrated photonics chip.
12 . The method of claim 10 , further comprising the step of steering said probe signal using a beam steering unit.
13 . The method of claim 12 , wherein said beam steering unit comprises micro electro mechanical system based mirrors or digital micro-mirror devices.
14 . The method of claim 10 , wherein said optical transceiver is further configured to operate as a receiver to facilitate said receiving step.
15 . The method of claim 1 , wherein said performing step is performed with by a single photon detection unit.
16 . The method of claim 15 , wherein said single photon detection unit is capable of mode selective frequency conversion.
17 . The method of claim 15 , wherein said single photon detection unit is also configured to perform said upconverting step.
18 . The method of claim 1 , wherein said upconverting step is performed by a nonlinear waveguide, optical bandpass filters, and a photodiode configured to detect upconverted signals.
19 . The method of claim 18 , wherein said waveguide is a periodically poled lithium niobate waveguide.
20 . The method of claim 1 , wherein said obtaining step is performed by a controller module.
21 . The method of claim 20 , wherein said temporally aligning step is facilitated by passing said pump optical pulse through an optical delay line controlled by said controller module.
22 . The method of claim 1 , further comprising the step of performing a mathematical transform on said photon counting data.
23 . The method of claim 22 , wherein said mathematical transform is a Fourier Transform.
24 . The method of claim 1 , adapted for use at ranges of about one kilometer or more.
25 . The method of claim 1 , adapted for use with nonlinear media.
26 . The method of claim 1 , adapted for use with multiscattering or highly scattering media.
27 . The method of claim 1 , adapted for use with targets outside of a line-of-sight.
28 . The method of claim 1 , adapted for use in the presence of strong turbulence.
29 . A system for remote vibration and acoustic measurement, comprising:
means for creating a probe signal;
means for creating a pump optical pulse;
means for collimating said probe signal;
means for transmitting said probe signal to a target;
means for receiving a backscattered signal from said target;
means for temporally aligning said pump pulse with said backscattered signal;
means for upconverting said backscattered signal to obtain a frequency upconverted backscattered signal;
means for performing picosecond time gating detection on said frequency upconverted backscattered signal and performing quantum parametric mode selection on said frequency upconverted backscattered signal to obtain photon counting data; and
means for extracting vibration and/or acoustic measurement data from said photon counting data.