Mach-Zehnder Interferometer Wavelength Sweep Phase Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
It is difficult to adjust and change the optical path difference between split lights in a Mach-Zehnder interferometer, making it challenging to implement a white light interferometer and phase shift interferometer of the wavelength sweep type, as the existing interference observation apparatus lacks the functionality to adjust this difference.
Innovation Solution
Incorporating a light source with a variable wavelength and an interference optical system forming a Mach-Zehnder interferometer, including a splitting beam splitter and a combining beam splitter, along with a control unit that adjusts the phase difference between the split lights by controlling the wavelength of the laser light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an optical system of a Mach-Zehnder interferometer is used, then the interference observation apparatus can be configured with a splitting beam splitter and combining beam splitter, but it is difficult to adjust and change the optical path difference between split lights from the splitting to the combining
Solution Approach 1:
The patent changes the parameter of light wavelength to adjust the phase difference between split lights. By using a light source with variable wavelength (such as a laser diode whose wavelength changes with drive current), the system can control the optical path difference without mechanical adjustments, thereby resolving the contradiction between fixed optical configuration and adjustable optical path difference.
2Device complexity
If an optical system of a Mach-Zehnder interferometer is used, then the apparatus structure is established, but it is difficult to realize a white light interferometer and a phase shift interferometer of a wavelength sweep type
Solution Approach 1:
The patent introduces dynamic control of the light source wavelength, allowing the interferometer to adapt to different operating modes. By dynamically changing the wavelength parameter, the same Mach-Zehnder structure can function as a white light interferometer, phase shift interferometer, or wavelength sweep interferometer, thereby achieving versatility without structural changes.
3Device complexity
If no wavelength control function is provided, then the apparatus is simpler, but the phase difference between split lights cannot be adjusted
Solution Approach 1:
The patent replaces mechanical adjustment mechanisms with electrical/optical control. Instead of using mechanical devices to change optical path length, the system uses electrical control of the light source wavelength (via drive current modulation) to achieve phase difference adjustment, simplifying the mechanical structure while enhancing operational capability.
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 allows for easy optical adjustment and acquisition of interference images, enabling efficient operation of the Mach-Zehnder interferometer and facilitating the realization of phase shift interferometry.
Implementation Method 1
a light source for laser light having a variable wavelength
Implementation Method 2
a control unit for controlling a wavelength of the laser light output from the light source to adjusts a phase difference between the first split light and the second split light at the combining by the combining beam splitter
Implementation Method 3
a splitting beam splitter for splitting the laser light output from the light source to output first split light and second split light
Implementation Method 4
a combining beam splitter for combining the first split light and the second split light to output combined light
Data Source
AI summary
An interference observation apparatus includes a light source, a splitting beam splitter, a combining beam splitter, a mirror, a beam splitter, a mirror, a piezo element, a stage, a photodetector, an image acquisition unit, and a current control unit. An interference optical system from the splitting beam splitter to the combining beam splitter forms a Mach-Zehnder interferometer. The current control unit controls a wavelength of laser light output from the light source to adjust a phase difference between two split light components at the combining by the combining beam splitter.