Acousto-Optic Deflector Multi-Frequency Integration
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Solution Overview
Problem
Current lidar systems require separate acousto-optic deflectors for different frequencies, leading to larger size, higher power consumption, and reduced matching behavior, limiting their versatility and efficiency in applications such as microscopy and laser communication.
Innovation Solution
A single acousto-optic deflector with a slanted end and stepped surface, utilizing a conductive layer and crystals with electrodes, is designed to operate at two distinct frequencies (40 MHz and 60 MHz) by impedance matching and precise grinding of the optical element, allowing for efficient control of laser beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate acousto-optic deflectors are used for different frequencies, then frequency-specific performance is optimized, but device size and power consumption increase
Solution Approach 1:
The patent combines multiple frequency handling capabilities into a single acousto-optic deflector by integrating multiple crystals with different acoustic velocities onto one optical element. This merging approach allows the device to handle both 40 MHz and 60 MHz frequencies while maintaining a compact form factor, resolving the contradiction between versatility and size.
Solution Approach 2:
The optical element is designed with a slanted end and stepped surface that can interface with multiple crystal types, making it a universal platform for handling different frequencies. This multi-functional design enables a single deflector to replace what would traditionally require multiple separate devices, reducing overall system size while maintaining frequency-specific optimization.
2Adaptability or versatility
If separate acousto-optic deflectors are used for different frequencies, then frequency-specific performance is optimized, but power consumption increases
Solution Approach 1:
By merging multiple frequency capabilities into a single deflector with shared optical and control infrastructure, the system reduces redundant power consumption. The single optical element and integrated crystal array eliminate the need for separate power supplies and control systems that would be required for multiple independent deflectors.
3Adaptability or versatility
If separate acousto-optic deflectors are used for different frequencies, then frequency-specific performance is optimized, but matching behavior is reduced
Solution Approach 1:
The patent applies local quality by creating stepped surfaces with different heights on the optical element, where each step is optimized for a specific frequency. The first step height optimizes coupling for 40 MHz while the second step height optimizes for 60 MHz, allowing each region to have tailored properties for its designated frequency while maintaining overall system integration.
4Volume of stationary object
If a single acousto-optic deflector handles multiple frequencies, then device size and power consumption are reduced, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into distinct steps: forming steps on the optical element surface, depositing conductive layers on specific steps, and selectively bonding crystals to corresponding steps. This segmentation of the manufacturing process makes the complex fabrication manageable by breaking it down into sequential, specialized operations.
Solution Approach 2:
The stepped surface structure enables local quality optimization during manufacturing, where different regions of the optical element can be processed differently. This allows selective crystal bonding and conductive layer deposition on specific steps, simplifying the overall manufacturing by enabling specialized processing for each frequency zone.
5Strength
If crystal bonding uses thick epoxy layers, then bonding strength is improved, but acoustic wave attenuation increases
Solution Approach 1:
The patent optimizes the epoxy layer thickness parameter to a specific range (5-20 micrometers) that balances mechanical bonding strength with acoustic wave transmission. This parameter optimization ensures sufficient mechanical attachment while minimizing the acoustic impedance mismatch and associated energy loss, resolving the contradiction between strength and energy loss.
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
The solution enables a compact, low-power acousto-optic deflector that can handle multiple frequencies, providing precise control over laser beam direction and reducing unwanted reflections, thus enhancing its applicability in various fields like microscopy and laser communication.
Implementation Method 1
a scanning module having one or more scanning elements configured to control the direction of the optical beam with an acousto-optic deflector (AOD)
Implementation Method 2
one or more crystals secured to each step; and electrodes positioned on each surface of each crystal
Data Source
AI summary
A LIDAR system includes a laser source configured to emit an optical beam; a detector module configured to receive and analyze the reflected optical signals; a scanning module having one or more scanning elements configured to control the direction of the optical beam with an acousto-optic deflector (AOD), wherein the AOD includes: an optical element having a surface with one or more steps formed thereon; a conductive layer formed on the surface with the steps; one or more crystals secured to each step; and electrodes positioned on each surface of each crystal.