Electromagnetic Wave Detection Device with Independent Pulse Front Tilt and Beam Diameter Control
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Solution Overview
Problem
Existing electromagnetic wave detection devices face challenges in independently setting the pulse front tilt angle and beam diameter of probe light pulses input to the optical effect unit, as these parameters are interdependent when the beam diameter adjusting optical system is placed subsequent to the pulse front tilting unit.
Innovation Solution
The device includes a light source, a beam diameter changing optical system, a pulse front tilting unit, a beam diameter adjusting optical system, an optical effect unit, and a photodetector, allowing for independent adjustment of the pulse front tilt angle and beam diameter of probe light pulses through separate optical systems before they are input to the optical effect unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the beam diameter adjusting optical system is placed subsequent to the pulse front tilting unit, then the pulse front tilt angle and beam diameter of probe light pulses cannot be set respectively and independently, but if the order is reversed or reconfigured, then independent setting of pulse front tilt angle and beam diameter becomes possible
Solution Approach 1:
The patent divides the optical path into distinct functional segments: a pulse front tilting unit that independently controls pulse front tilt angle, and a beam diameter adjusting optical system that independently controls beam diameter. By segmenting the optical system into these separate functional blocks with independent control mechanisms, the patent enables independent adjustment of both parameters without mutual interference, resolving the technical contradiction between ease of operation and device complexity.
2Manufacturing precision
If the beam diameter of probe light pulses is enlarged or reduced by the beam diameter adjusting optical system, then the pulse front tilt angle of the light pulses changes, but this interdependence makes it difficult to set both parameters to appropriate values
Solution Approach 1:
The patent implements preliminary action by establishing the pulse front tilt angle through the pulse front tilting unit before the beam diameter is adjusted by the beam diameter adjusting optical system. This sequential arrangement ensures that the pulse front tilt angle is set first and remains fixed during subsequent beam diameter adjustment, preventing any change in tilt angle and enabling precise independent control of both parameters.
Solution Approach 2:
The patent segments the optical system into a pulse front tilting unit and a beam diameter adjusting optical system with independent control mechanisms. The pulse front tilting unit uses a first optical element (such as a prism or grating) to control pulse front tilt angle, while the beam diameter adjusting optical system uses a second optical element (such as a lens) to control beam diameter. This segmentation eliminates the interdependence between the two parameters, allowing both to be set to appropriate values independently with high precision.
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
This configuration enables easy and appropriate setting of the pulse front tilt angle and beam diameter, allowing for precise control of the measurement time range and interaction area, improving the detection accuracy of electromagnetic waves.
Implementation Method 1
a beam diameter changing optical system which changes a beam diameter of the probe light pulses output from the light source
Implementation Method 2
the pulse front tilt angle (tilt angle with respect to a plane normal to a principal ray direction) γ of light pulses to be output from the pulse front tilting unit is expressed by formula tan γ=λ·dφ/dλ. λ means the wavelength of light pulses, and dφ/dλ means angular dispersion of the pulse front tilting unit at the wavelength λ
Implementation Method 3
an optical effect unit which is input with the probe light pulses output from the beam diameter adjusting optical system and is input with an electromagnetic wave being an object to be detected, optical characteristics of which change due to propagation of the electromagnetic wave
Implementation Method 4
a photodetector which detects the probe light pulses output from the optical effect unit
Data Source
AI summary
Probe light pulses output from a light source are input to an optical effect unit after the beam diameter is changed by a beam diameter changing optical system, the pulse front is tilted by a pulse front tilting unit, and the beam diameter is adjusted by a beam diameter adjusting optical system. To the optical effect unit, probe light pulses output from the beam diameter adjusting optical system are input, and an electromagnetic wave being an object to be detected is also input. Optical characteristics of the optical effect unit change due to propagation of the electromagnetic wave, and probe light pulses affected by the change in optical characteristics are output from the optical effect unit. The probe light pulses output from the optical effect unit are detected by a photodetector.