High-order harmonic observation device using birefringent optical delay
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Solution Overview
Problem
Current methods for measuring petahertz currents, particularly those involving high-order harmonic observation, require complex device configurations and are challenging to perform in atmospheric conditions due to the need for high time accuracy and environmental control, limiting their practicality and accessibility.
Innovation Solution
A high-order harmonic observation device and method utilizing an optical delay circuit with a birefringent optical element to generate coaxial pulse lights with a time difference, allowing for the detection of petahertz currents in a simplified configuration, capable of operating in the atmosphere with high time accuracy, using a near-infrared light source and an organic superconductor as the measurement object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional interferometric methods are used to achieve high time accuracy in petahertz current measurement, then measurement precision is improved, but device complexity increases and atmospheric operation becomes difficult
Solution Approach 1:
The patent extracts the essential function of generating time-delayed pulse pairs from the complex interferometric system by using a birefringent optical element (such as a quarter-wave plate or half-wave plate) to split a single pulse into two pulses with different polarization states and time delays. This extraction simplifies the device by removing the need for complex interferometric arrangements while maintaining the ability to achieve attosecond-level time accuracy in petahertz current measurements.
Solution Approach 2:
The patent replaces mechanical interferometric systems with an optical system based on birefringence. Instead of using mechanical displacement of mirrors or beam splitters to create time delays, the invention uses the optical property of birefringent materials to naturally split and delay pulses through polarization manipulation. This substitution eliminates mechanical complexity and enables atmospheric operation while preserving measurement precision.
2Reliability
If vacuum chambers are used to reduce light fluctuation influence, then measurement reliability is improved, but device complexity and size increase
Solution Approach 1:
The patent extracts and addresses the specific source of light fluctuation influence by focusing on polarization stability rather than attempting to eliminate all environmental factors through vacuum chambers. By using polarization-maintaining optical elements and carefully designed birefringent components, the system achieves reliable measurements in atmospheric conditions without requiring complex vacuum infrastructure.
Solution Approach 2:
The patent changes the operating parameters by optimizing polarization states and optical path configurations to minimize sensitivity to atmospheric fluctuations. By adjusting polarization angles, optical path lengths, and birefringent element orientations, the system achieves measurement reliability comparable to vacuum-based systems while operating in the atmosphere, thereby avoiding the complexity of vacuum chambers.
3Measurement precision
If complex measurement devices are used to achieve high time accuracy, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent merges multiple functions (pulse splitting, time delay generation, polarization control) into a single integrated optical component or compact arrangement of birefringent elements. This consolidation reduces the number of separate components and alignment procedures required, making the system easier to operate while maintaining attosecond-level time accuracy. The unified optical path simplifies both setup and daily operation compared to traditional interferometric systems.
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 the observation and analysis of petahertz currents with significantly reduced device complexity and improved time accuracy, achieving measurements in the attosecond region while maintaining stability and accuracy comparable to or exceeding traditional interferometric methods.
Implementation Method 1
utilizing an optical delay circuit with a birefringent optical element to generate coaxial pulse lights with a time difference
Implementation Method 2
a high-order harmonic observation device including: an output unit configured to output a first pulse light having a prescribed wavelength and a prescribed pulse width, which are adjusted according to a high-order harmonic generated in a measurement object
Data Source
AI summary
A high-order harmonic observation device includes: an output unit which outputs a first pulse light having a prescribed wavelength and a prescribed pulse width; an optical delay circuit to which the first pulse light is input, and which coaxially outputs a pair of second pulse lights having a time difference relative to each other and inputs the pair of second pulse lights to a measurement object to generate a high-order harmonic; and a detection unit which detects the high-order harmonic.