Pulsed Laser Power Correction for Relaxation Oscillation Suppression
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Solution Overview
Problem
Existing laser power correction methods fail to accurately account for the aging and environmental effects on laser performance, leading to inaccurate average power output and potential damage from relaxation oscillation, which is not effectively suppressed.
Innovation Solution
A method involving setting duty cycles and frequencies, adjusting current to achieve preset power, and recording current values to determine the actual current-average power relationship, using a formula to calculate accurate correction based on minimum and maximum currents and peak powers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a small step signal is added to the square-wave driving current to suppress relaxation oscillation, then relaxation oscillation is suppressed and component damage is prevented, but the average output power of the laser becomes inaccurate
Solution Approach 1:
The patent introduces a compensation calculation mechanism as an intermediary between the relaxation oscillation suppression step signal and the average output power measurement. By calculating the energy contribution of the step signal and subtracting it from the total measured energy, the system accurately determines the average output power despite the presence of the suppression signal.
Solution Approach 2:
The patent implements a feedback mechanism where the actual average output power is measured, compared with the expected power, and used to correct the driving current. This closed-loop control compensates for the power measurement errors introduced by relaxation oscillation suppression, ensuring accurate power output.
2Measurement precision
If existing power calibration methods recalibrate the drive current when average power output is inaccurate, then power correction is attempted, but the correction is inaccurate because it does not account for the energy added by the relaxation oscillation suppression step
Solution Approach 1:
The patent performs preliminary calculation of the step signal energy contribution before the power correction process. By pre-calculating how much energy the relaxation oscillation suppression step adds to the total output, the system can accurately compensate for this known quantity during the correction phase, improving correction accuracy without excessive complexity.
Data Source
AI summary
The present disclosure provides a laser power correction method, device, and laser for suppressing relaxation oscillation. The method includes: setting the laser to a first duty cycle and a first frequency, adjusting current so that the average power is a preset power, and recording the present current value; adjusting the frequency so that the average power is the preset power, recording all frequency values to obtain a frequency interval; changing the duty cycle to obtain frequency intervals; setting the laser to a second duty cycle and the representative frequency, adjusting the current so that the average power is the minimum/maximum average power, recording the minimum and maximum currents, and determining a current-average power relationship; changing the duty cycle to obtain the current-average power relationship. The present disclosure is applicable to a pulsed laser control method that adds a small step signal to suppress relaxation oscillation.