Laser Circuit Temperature Compensation for Stable Radiation Intensity
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Solution Overview
Problem
Laser circuits are sensitive to temperature fluctuations, which affect the optical power and require complex control mechanisms to maintain consistent radiation intensity.
Innovation Solution
Incorporating a temperature sensor and a temperature compensating circuit within the laser circuit, coupled with digital-to-analog converters, to adjust the laser current and reduce the influence of temperature variations, thereby simplifying the control of radiation intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature compensation is implemented through complex control mechanisms, then radiation intensity consistency is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where a temperature sensor continuously monitors the laser's temperature and feeds this information to a control circuit. The control circuit adjusts the laser current in real-time based on temperature variations, creating a closed-loop system that automatically maintains consistent radiation intensity without requiring complex external control mechanisms.
Solution Approach 2:
The laser circuit is designed to self-regulate its temperature compensation through integrated temperature sensing and automatic current adjustment. The system uses its own temperature sensor and control circuitry to detect and correct temperature-induced variations in radiation intensity, eliminating the need for separate complex control systems.
2Reliability
If temperature sensor and compensating circuit are added, then temperature compensation effectiveness is improved, but manufacturing effort increases
Solution Approach 1:
The patent combines the temperature sensor, compensating circuit, and laser into a single integrated circuit module. By merging these components into one unified structure, the patent reduces the number of separate parts that need to be manufactured and assembled, thereby lowering manufacturing effort while maintaining effective temperature compensation.
Solution Approach 2:
The integrated circuit is designed to perform multiple functions simultaneously: laser radiation generation, temperature sensing, and automatic temperature compensation. This multi-functional design eliminates the need for separate dedicated components for each function, simplifying the manufacturing process while ensuring effective temperature compensation.
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 effectively reduces the effort required for temperature compensation, allowing for precise control of laser radiation intensity with reduced complexity and lower realization costs.
Implementation Method 1
A laser circuit typically provides radiation in form of pulses. The radiation is e.g. light in the visible range. The radiation intensity is controlled by a laser current that flows through the laser. Laser circuits can be used in different markets such as automotive, aerospace, consumer, industry, augmented reality, mixed reality and/or virtual reality. A characteristic of a laser typically depends on a temperature of the laser.
Data Source
AI summary
A laser circuit includes a temperature sensor, a temperature compensating circuit having an input coupled to the temperature sensor, a video digital-to-analog converter, and a laser with a first and a second terminal. The first terminal of the laser is coupled to the temperature compensating circuit and to the video digital-to-analog converter. Moreover, a method for operating a laser circuit is described.