Optical Scanning Control Circuit for ASOPS
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Solution Overview
Problem
Existing devices for generating temporally distant light pulses face limitations in scanning speed and precision due to mechanical mirror adjustments and the large scanning range of ASOPS techniques, leading to signal distortion and calibration challenges in ultra-fast time-resolved spectroscopy applications.
Innovation Solution
A control circuit with a phase detector, corrective element, and controlling element that directly influences the repetition rate of light pulse sequences, avoiding signal distortion by compensating control deviation signals within the control bandwidth, allowing for high scanning speed and precise calibration of the time axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical mirror is moved to vary the time offset between light pulses, then the scanning range can be adjusted, but the scanning speed becomes slow due to the large stroke required
Solution Approach 1:
The patent replaces the mechanical mirror movement system with an optical interferometer system. Instead of physically moving a mirror over a large stroke to vary the time offset, the invention uses optical path length differences in an interferometer configuration to achieve the same effect. This substitution eliminates the mechanical movement constraints and enables faster scanning speeds while maintaining the required scanning range.
Solution Approach 2:
The patent transitions from a one-dimensional mechanical displacement approach to a two-dimensional optical path approach. By using an interferometer with multiple optical paths, the system can achieve time offset variation through optical path length differences rather than direct mechanical displacement, effectively adding an optical dimension to the control mechanism and enabling faster operation.
2Adaptability or versatility
If the ASOPS technique is used to generate light pulse sequences with variable time offset, then the complete time interval can be scanned, but the scanning range becomes much too large for practical applications
Solution Approach 1:
The patent applies local quality by making the scanning range adaptive rather than uniform. The interferometer configuration allows the system to provide fine time offset control in the region of interest while maintaining the capability for broader scanning when needed. This localized optimization of the scanning range matches the actual requirements of time-resolved spectroscopy applications.
Solution Approach 2:
The patent changes the parameter of scanning range from a fixed large interval to a variable, application-specific range. By using the interferometer's optical path length control, the system can adjust the effective scanning range to match the specific time resolution requirements of different experiments, rather than always operating over the maximum possible range.
3Adaptability or versatility
If a mechanical mirror is used to adjust the time offset, then the beam path can be varied, but the beam diameter varies undesired due to beam divergency
Solution Approach 1:
The patent replaces mechanical mirror movement with an optical interferometer configuration that controls beam path through optical path length differences rather than physical displacement. This substitution maintains beam diameter stability because the beams travel through fixed optical paths with controlled length differences, avoiding the divergency issues associated with mechanical mirror movement.
Data Source
AI summary
A device for generating temporally distant light pulses is provided, the device including at least a first light source for generating a first sequence of light pulses at a first repetition rate, and a second light source for generating a second sequence of light pulses at a second repetition rate. In some embodiments the device includes at least one actuator element which influences the first and/or the second repetition rate, and a control element which charges the actuator element with a periodical modulation signal for periodical variation of the first and/or second repetition rate. A control circuit is also provided including at least a phase detector, a corrective element, a control element, and a superposition element that forms an actuator signal from a modulation signal and an output signal of the control element, and which charges the actuator element with the actuator signal.