Laser Tube Temperature Stabilization via Multi-Point Sensor Segmentation
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Solution Overview
Problem
Existing laser frequency stabilization technologies face challenges in achieving high frequency reproducibility due to non-uniform temperature distribution within laser tubes, inadequate temperature measurement methods, and limitations in frequency stabilization control algorithms, leading to inconsistencies in measuring accuracy and frequency drift.
Innovation Solution
A high-frequency-reproducibility laser frequency stabilization method and device utilizing multi-point acquisition of laser tube temperature, which includes a double-longitudinal-mode laser device with embedded temperature sensors and heating films, allowing for precise temperature control and stabilization through a frequency stabilization control circuit that integrates optical power and temperature data for accurate cavity length adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-point temperature measurement is used to represent integral actual temperature of the laser tube, then the temperature measurement system is simple, but the temperature distribution of the whole laser tube cannot be shown and measuring error increases
Solution Approach 1:
The patent divides the laser tube into multiple temperature measurement zones by placing temperature sensors at different positions (including the center and wall regions) along the laser tube. This segmentation allows the system to capture the non-uniform temperature distribution rather than relying on a single-point measurement, thereby improving measurement precision while maintaining reasonable system complexity.
2Device complexity
If integral undifferentiated heating is adopted, then the heating system is simple, but the temperature field inside the laser tube is non-uniform causing frequency drift
Solution Approach 1:
The patent segments the heating system into multiple independent heating zones along the laser tube, with each zone controlled by separate heating power supplies. This allows differentiated heating control for different regions (center vs. wall areas) to achieve uniform temperature distribution and eliminate frequency drift caused by thermal non-uniformity.
Solution Approach 2:
The patent applies local quality control by providing different heating powers to different regions of the laser tube based on their specific thermal characteristics. The heating system adjusts the temperature of each segment independently to compensate for heat loss variations, ensuring uniform temperature distribution throughout the laser tube.
3Productivity
If the laser power-on and power-off time interval is short, then the device utilization is high, but heat inside the laser tube cannot be sufficiently radiated out and temperature gradient is obvious
Solution Approach 1:
The patent implements preliminary cooling action by activating the cooling system before the laser is powered on again after a short interval. This preliminary cooling removes residual heat and reduces the temperature gradient, allowing the laser to be rapidly reused without significant thermal accumulation, thereby maintaining high device utilization while controlling temperature gradients.
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 approach significantly improves frequency reproducibility from 10−8 to 10−9, reducing the influence of temperature non-uniformity and environmental factors, and directly reflects cavity length changes, thereby enhancing the stability and accuracy of the laser device.
Implementation Method 1
uses an electric heating device as an actuator to heat a laser tube
Implementation Method 2
Through corresponding control algorithms, the power of the electric heating device is adjusted, so that the cavity length of a resonant cavity changes
Implementation Method 3
multi-point acquisition of laser tube temperature
Implementation Method 4
a laser device, a relevant interference optical path
Implementation Method 5
laser interferometry technology
Data Source
AI summary
The disclosure provides a high-frequency-reproducibility laser frequency stabilization method and device based on multi-point acquisition of laser tube temperature. The laser frequency stabilization device includes: a frequency stabilization control circuit. The frequency stabilization control circuit includes a polarizing beam splitter, an optical power conversion circuit, an A/D conversion circuit, a temperature measuring circuit, a microprocessor, a D/A converter and a heating film driver. The polarizing beam splitter is disposed outside any one of laser transmitting holes. The optical power conversion circuit is disposed on reflection and refraction optical paths of the polarizing beam splitter. The optical power conversion circuit, the A/D conversion circuit, the microprocessor, the D/A converter, the heating film driver and a plurality of groups of heating films are sequentially in one-way connection. Temperature sensors, the temperature measuring circuit and the microprocessor are sequentially in one-way connection.