Pulse Correlation Dispersion Measurement Without Spectral Optics
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Solution Overview
Problem
Existing dispersion measurement apparatuses require complex optical systems involving dispersive elements and photodetectors to measure emission spectra, making them cumbersome.
Innovation Solution
A dispersion measurement apparatus that forms a light pulse train with multiple pulses of differing time differences and center wavelengths, uses a correlation optical system to generate cross- or autocorrelation light, and employs a photodetection unit to estimate wavelength dispersion based on the temporal waveform of the correlation light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dispersive element and photodetector are used to measure emission spectrum, then wavelength dispersion measurement is achieved, but the optical system becomes complicated
Solution Approach 1:
The invention extracts only the necessary functional element (nonlinear optical crystal for correlation measurement) from the traditional spectrum measurement system, eliminating the dispersive element and photodetector while retaining the core measurement capability through temporal correlation analysis
Solution Approach 2:
The invention replaces the mechanical/optical spectrum measurement system (dispersive elements and photodetectors) with a temporal correlation measurement system using nonlinear optical processes and photodetection of intensity, substituting spatial-spectral analysis with temporal-domain analysis
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 simple and accurate measurement of wavelength dispersion without the need for complex optical systems, allowing for efficient dispersion compensation.
Implementation Method 1
a pulse forming unit for forming a light pulse train including a plurality of second light pulses having time differences and center wavelengths different from each other from a first light pulse
Implementation Method 2
a correlation optical system for receiving the light pulse train output from the pulse forming unit and outputting correlation light including a cross-correlation or an autocorrelation of the light pulse train
Implementation Method 3
a photodetection unit for detecting a temporal waveform of the correlation light
Data Source
AI summary
A dispersion measurement apparatus includes a pulse forming unit, a correlation optical system, a photodetection unit, and an operation unit. The pulse forming unit forms a light pulse train including a plurality of light pulses having time differences and center wavelengths different from each other from a measurement target light pulse output from a pulsed laser light source. The correlation optical system receives the light pulse train output from the pulse forming unit and outputs correlation light including a cross-correlation or an autocorrelation of the light pulse train. The photodetection unit detects a temporal waveform of the correlation light output from the correlation optical system. The operation unit estimates a wavelength dispersion amount of the pulsed laser light source based on a feature value of the temporal waveform of the correlation light.