Compressed ultrafast imaging velocity interferometer system for any reflector

A compressed ultrafast imaging velocity interferometer system for any reflector, comprising a light source and target system (100), an etalon interference system (200), a compressed ultrafast imaging system (300), a timing control system (400) and a data processing system (500);

• wherein, the light source and target system (100) comprises a nanosecond laser (1), a first convex lens (2), a first beam splitter (3), a second convex lens (4), a third convex lens (5), a quartz glass sheet (6), a target (7) and a fourth convex lens (8);
• wherein the nanosecond laser (1), the first convex lens (2) and the first beam splitter (3) are successively coupled on an optical path;
• a laser pulse generated by the nanosecond laser (1) passes through the first convex lens (2), is transmitted by the first beam splitter (3), then passes through the second convex lens (4), the third convex lens (5) and the quartz glass sheet (6), and then irradiates on the target (7) to form a signal scene via a reflection;
• the signal scene passes through the quartz glass sheet (6), the third convex lens (5), the second convex lens (4) again and then is reflected by the first beam splitter (3) to reach the fourth convex lens (8);
• the etalon interference system (200) comprises a second beam splitter (9), an etalon (10), a holophote (11) and a third beam splitter (12);
• wherein an optical path is split into two paths by the second beam splitter (9), where the etalon (10) is coupled on one of the two paths, and the holophote (11) is coupled on another of the two paths;
• and the etalon (10) and the holophote (11) are respectively coupled with the third beam splitter (12) on an optical path;
• the compressed ultrafast imaging system (300) comprises a fifth convex lens (13), a fourth beam splitter (14), a sixth convex lens (15), a digital micromirror device (16) and a streak camera (17);
• wherein the fifth convex lens (13) is coupled with the fourth beam splitter (14) on an optical path, and an optical path is split into two paths by the fourth beam splitter (14), wherein the sixth convex lens (15) and the digital micromirror device (16) are successively coupled on one of the two optical paths, and the streak camera (17) is coupled on another of the two optical paths, wherein the digital micromirror device (16) is placed on an image plane of an optical imaging system comprising the fifth convex lens (13), the fourth beam splitter (14) and the sixth convex lens (15);
• the timing control system (400) comprises a digital delay generator (18);
• the data processing system (500) comprises a computer (19) which is configurated to calculate and reconstruct a three-dimensional interference fringe image, and to calculate a shock wave velocity of laser inertial confinement fusion, wherein a compressed sensing algorithm with an Augmented Lagrangian algorithm is used in the calculation and reconstruction of the three-dimensional interference fringe image, and a phase deconvolution algorithm with a flood algorithm is used in the calculation of the shock wave velocity;
• the fourth convex lens (8) of the light source and target system (100) is coupled with the second beam splitter (9) of the etalon interference system (200) on an optical path;
• the nanosecond laser (1) of the light source and target system (100) is electrically connected with the digital delay generator (18) of the timing control system (400);
• the target (7) of the light source and target system (100) is electrically connected with the digital delay generator (18) of the timing control system (400);
• the third beam splitter (12) of the etalon interference system (200) is coupled with the fifth convex lens (13) of the compressed ultrafast imaging system (300) on an optical path;
• the streak camera (17) of the compressed ultrafast imaging system (300) is electrically connected with the digital delay generator (18) of the timing control system (400) and the computer (19) of the data processing system (500), respectively;
• and
• the digital micromirror device (16) of the compressed ultrafast imaging system (300) is electrically connected with the computer (19) of the data processing system (500),
• wherein, the digital delay generator (18) is connected with the nanosecond laser (1) and the target (7) of the light source and target system (100), and the streak camera (17) of the compressed ultrafast imaging system (300) simultaneously, to precisely control a timing on the femtosecond order, and to compensate an inherent delay and a signal transmission delay of the system, so that each system can start to work when the laser arrives so as to record the complete signal to be measured.