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Methods and apparatus for covert detection of an interrogating device. In one example a method includes receiving an interrogation beam at an optical system, imaging a scene including a source of the interrogation beam without retro-reflecting the interrogation beam to produce an image, and analyzin

Methods and apparatus for covert detection of an interrogating device. In one example a method includes receiving an interrogation beam at an optical system, imaging a scene including a source of the interrogation beam without retro-reflecting the interrogation beam to produce an image, and analyzing the image to determine an approximate location of the source within the scene. In some examples, a threat detection sensor is used to further analyze the interrogation beam to determine information about the interrogating device.

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1. A non-retro-reflective optical threat detection system comprising: a structured relay optic configured to receive electromagnetic radiation representing a source image volume, the electromagnetic radiation including an interrogation beam, the structured relay optic further configured to slice the

1. A non-retro-reflective optical threat detection system comprising: a structured relay optic configured to receive electromagnetic radiation representing a source image volume, the electromagnetic radiation including an interrogation beam, the structured relay optic further configured to slice the source image volume into a plurality of image slices and to reimage the plurality of image slices onto a tilted image plane that is tilted relative to an optical axis of the non-retro-reflective optical threat detection system;an imaging detector aligned with the tilted image plane and configured to reconstruct an image from the plurality of image slices, the image including an image of the interrogation beam, and to reflect the interrogation beam off-axis with respect to the optical axis of the non-retro-reflective optical threat detection system; anda processor coupled to the imaging detector and configured to process the image to determine an approximate location of a source of the interrogation beam within a field of view of the non-retro-reflective optical threat detection system. 2. The non-retro-reflective optical threat detection system of claim 1, wherein the structured relay optic is configured to spatially position the plurality of image slices such that a depth of focus of each image slice overlaps the tilted image plane. 3. The non-retro-reflective optical heat detection system of claim 1, wherein the imaging detector is a focal plane array. 4. The non-retro-reflective optical threat detection system of claim 1, further comprising: a threat detection sensor positioned off-axis with respect to the optical axis of the non-retro-reflective optical threat detection system and configured to receive and analyte the interrogation beam. 5. The non-retro-reflective optical threat detection system of claim 4, wherein the threat detection sensor is configured to determine a modulation format of the interrogation beam. 6. The non-retro-reflective optical threat detection system of claim 5, wherein the threat detection sensor is configured to provide identifying information corresponding to the source of the interrogation beam based on the modulation format of the interrogation beam. 7. The non-retro-reflective optical threat detection system of claim 6, wherein the threat detection sensor is further configured to determine a wavelength of the interrogation beam. 8. The non-retro-reflective optical threat detection system of claim 7, wherein the threat detection sensor is configured to provide the identifying information based on the modulation format and the wavelength of the interrogation beam. 9. The non-retro-reflective optical threat detection system of claim 4, wherein the threat detection sensor is configured to determine a wavelength of the interrogation beam. 10. The non-retro-reflective optical threat detection system of claim 4, wherein the threat detection sensor is configured to receive the interrogation beam reflected by the imaging detector. 11. An optical threat detection system comprising: a plurality of optical sensors each including: a structured relay optic configured to receive electromagnetic radiation representing a source image volume, the electromagnetic radiation including an interrogation beam, the structured relay optic further configured to slice the source image volume into a plurality of image slices and to reimage the plurality of image slices onto a tilted image plane that is tilted relative to an optical axis of the optical sensor;an imaging detector aligned with the tilted Image plane and configured to reconstruct an image from the plurality of image slices, the image including an image of the interrogation beam, and to reflect the interrogation beam off-axis with respect to the optical axis of the optical sensor system; anda processor configured to process the image to determine approximate location information about a source of the interrogation beam;wherein the processor of at least one of the plurality of optical sensors is configured to receive the approximate location information from others of the plurality of optical sensors and to determine a location of the source based on combined analysis of the approximate location information from the plurality of optical sensors. 12. The optical threat detection system of claim 11, wherein the plurality of optical sensors are communicatively coupled together to form a network of sensors. 13. The optical threat detection system of claim 12, wherein each of the plurality of optical sensors further includes a threat detection sensor positioned off-axis with respect to the optical axis of the optical sensor and configured to receive and analyze the interrogation beam reflected from the imaging detector to determine identification information about the source. 14. The optical threat detection system of claim 13, wherein the threat detection sensor is configured to determine at least one of a wavelength and a modulation format of the interrogation beam. 15. A method of covert detection of an interrogating device comprising: receiving an interrogation beam at an optical system;imaging a scene including a source of the interrogation beam without retro-reflecting the interrogation beam to produce an image, including: segmenting a source image volume of the scene into a plurality of image slices, each image slice having an image volume;individually reimaging the plurality of image slices onto a tilted image plane tilted with respect to an optical axis of the optical system such that the image volume of each image slice overlaps the tilted image plane; andreconstructing a substantially in-focus image at the tilted image plane from the plurality of image slices; andanalyzing the image to determine an approximate location of the source within the scene. 16. The method of claim 15, further comprising: reflecting the interrogation beam off-axis to a threat detection sensor; andanalyzing the reflected interrogation beam at the threat detection sensor to determine identification information about the source. 17. The method of claim 16, wherein analyzing the reflected interrogation beam includes determining at least one of a wavelength and a modulation format of the interrogation beam. 18. The method of claim 15, further comprising sharing the approximate location information among a plurality of optical systems. 19. They method of claim 18, further comprising collectively processing the approximate location information from the plurality of optical systems to obtain the location of the source of the interrogation beam.