Semiconductor Laser Temperature Control for Stable Oscillation Wavenumber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor laser devices experience variations in oscillation wavenumber due to indirect temperature measurement, leading to inaccuracies in temperature control, especially from circumferential temperature changes.
Innovation Solution
A semiconductor laser device with a temperature control system that adjusts the target temperature based on supply signals to the Peltier element, using relationship data to maintain stability in oscillation wavenumber, incorporating a temperature sensor, a Peltier element, and a control device to manage supply signals and power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is disposed separately from the semiconductor laser element to measure temperature, then the temperature control system can be implemented, but the measured temperature does not accurately reflect the actual laser element temperature due to circumferential temperature changes
Solution Approach 1:
The patent implements a feedback control mechanism where the temperature sensor continuously monitors the temperature control part temperature, and the control device adjusts the supply signal to the Peltier element based on the difference between measured and target temperature. This closed-loop feedback system compensates for the spatial separation between sensor and laser element, maintaining accurate temperature control despite circumferential temperature variations.
Solution Approach 2:
The patent changes the control parameter from directly controlling laser element temperature to controlling the temperature control part temperature. By adjusting the target temperature of the temperature control part based on the supply signal to the Peltier element, the system indirectly maintains the laser element temperature within acceptable ranges despite the sensor's spatial separation.
2Device complexity
If the target temperature is fixed without considering supply signal variations, then the control system is simple, but oscillation wavenumber variations occur due to circumferential temperature changes
Solution Approach 1:
The patent makes the target temperature dynamic by adjusting it according to the supply signal to the Peltier element. Instead of using a fixed target temperature, the system continuously adapts the target temperature based on actual operating conditions, thereby compensating for circumferential temperature changes and maintaining stable oscillation wavenumber without significantly increasing system complexity.
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 oscillation wavenumber variations caused by circumferential temperature changes, ensuring precise control and stability in the semiconductor laser device's operation.
Implementation Method 1
A semiconductor laser element to emit laser light has conventionally been mounted on a cooling module including a Peltier element in order to perform the temperature control.
Data Source
AI summary
The present invention is intended to reduce variations in oscillation wavenumber of a semiconductor laser element due to the influence of circumferential temperatures. The invention includes a semiconductor laser semiconductor laser element, a temperature control part to control a temperature of the semiconductor laser element, a temperature sensor to detect a temperature of the temperature control part, and a temperature control device to control a supply signal to the temperature control part so that a detected temperature obtained from the temperature sensor reaches a predetermined target temperature. The temperature control device changes a target temperature for the temperature control part depending on a supply signal to the temperature control part.