Ultrafast Framing Optical Imaging Device with High Spatial Resolution
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Solution Overview
Problem
Current ultrafast imaging technologies face limitations in achieving high spatial and temporal resolution for single-shot transient events, as they require high framing rates and large frame numbers, which are restricted by scanning speed and medium response times, making real-time imaging challenging.
Innovation Solution
A real-time ultrafast framing optical imaging device utilizing a femtosecond pulse laser system, second-harmonic generator, continuous illumination laser, and non-collinear optical parameter amplifiers to generate and record idle beams with CCD cameras, allowing for high spatial resolution and sub-picosecond time resolution without relying on fast response times of the recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pump-probe technology is used to achieve high time resolution, then time resolution is improved to femtosecond level, but it cannot work for real-time optical imaging of single-shot processes
Solution Approach 1:
The patent segments the ultrafast laser pulse into multiple temporally separated frames using optical delay lines, allowing each frame to be recorded by a standard camera sensor. This segmentation enables the capture of multiple instantaneous states of a single-shot ultrafast event, transforming a single-pulse measurement into a multi-frame temporal sequence that achieves both high time resolution and real-time imaging capability
Solution Approach 2:
The patent uses preliminary action by pre-synchronizing multiple camera exposures to different time delays relative to the pump pulse arrival. The camera exposure timings are predetermined and synchronized with the laser pulse sequence, allowing the system to capture multiple frames at predetermined time points during the ultrafast process before the event completes
2Productivity
If scanning method is used to increase framing rate, then framing rate can exceed conventional limits, but scan speed becomes the limiting factor restricting framing frequency
Solution Approach 1:
The patent replaces the mechanical scanning system with an optical delay line system that uses fixed optical path lengths to introduce precise time delays between frames. Instead of mechanically moving a scanner to achieve temporal separation, the system uses stationary optical components with predetermined path length differences, eliminating mechanical speed limitations and enabling higher framing rates determined only by the laser pulse repetition frequency
3Loss of information
If high framing rate and large frame number are required for single-shot processes, then more temporal information can be captured, but recording medium response time and scan speed become restrictive
Solution Approach 1:
The patent segments the temporal information capture into multiple independent camera exposures, each synchronized to a specific time delay. This segmentation allows the system to capture many frames (limited only by the number of cameras or sequential exposures) without requiring a single recording medium to respond ultrafast, as each frame is independently recorded by standard-speed cameras at their respective synchronized time points
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables real-time imaging with spatial resolution greater than 20 lines/mm and framing frequencies up to 10^12 fps, overcoming conventional scanning speed limitations and achieving high-resolution imaging of ultrafast events.
Implementation Method 1
The second-harmonic generator is set to generate second-harmonics of the ultrashort laser pulse
Implementation Method 2
the first pump amplifies the continuous signal beam transiently inside the first parameter amplifier and thereby generates first idle beam
Data Source
AI summary
The present application relates to the technical field of ultrafast imaging, and provides an ultrafast framing optical imaging device with a real-time high spatial resolution. The optical imaging device includes an ultrashort pulse laser system with a magnitude of femtosecond, a frequency multiplier, a wavelength splitter, a continuous illumination laser, a sampling plate, a calibration camera, a first imaging record module, and a second imaging record module. The present application mainly utilizes continuous light illumination ultrafast events and non-collinear light parameter amplifying technology that uses ultrashort pulse laser to pump/sample events at different moments, and adopts a plurality of CCD cameras to receive corresponding idle light images simultaneously and respectively and thereby realize ultrafast framing optical imaging with a high time resolution.