Pulse Light Source Phase Difference Stabilization
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Solution Overview
Problem
Existing systems fail to precisely control the difference in repetition frequency between two lasers due to environmental temperature changes affecting the piezoelectric element, leading to deviations from sine wave patterns in the slave laser's repetition frequency.
Innovation Solution
A pulse light source system that includes a phase difference detector, loop filter, adder, and piezoelectric element, where the repetition frequency control signal is adjusted to maintain a target phase difference between master and slave laser pulses, allowing the slave laser's resonator length to change through piezoelectric expansion and contraction, thereby stabilizing the frequency difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sinusoidal voltage is applied to the piezoelectric element to control the slave laser repetition frequency, then the repetition frequency can be varied, but the repetition frequency does not exhibit a sine wave pattern due to temperature changes affecting the piezoelectric element displacement
Solution Approach 1:
The patent implements a feedback control system where the phase difference between master and slave laser pulses is continuously detected and used to adjust the repetition frequency control signal. The detected phase difference is compared with a target value, and the difference (error signal) is fed back to adjust the piezoelectric element driving voltage, thereby compensating for temperature-induced deviations and maintaining precise phase difference control despite environmental changes.
2Adaptability or versatility
If the piezoelectric element displacement is used to control slave laser repetition frequency, then the frequency can be adjusted, but temperature changes cause displacement variations leading to frequency instability
Solution Approach 1:
The system continuously monitors the phase difference between master and slave laser pulses and uses this information to adjust the piezoelectric element driving voltage in real-time. This feedback mechanism compensates for temperature-induced displacement variations, maintaining stable frequency difference control despite environmental temperature changes.
3Adaptability or versatility
If environmental temperature is allowed to vary, then the system can operate in different conditions, but the piezoelectric element performance changes causing loss of sine wave pattern in repetition frequency
Solution Approach 1:
The feedback control system detects phase difference variations caused by temperature changes and adjusts the piezoelectric element driving voltage accordingly. This active compensation maintains the desired sine wave pattern in the repetition frequency even when environmental temperature varies, preserving frequency pattern stability across different operating conditions.
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 solution effectively stabilizes the phase difference and repetition frequency of the slave laser, even under temperature fluctuations, ensuring precise control and maintaining the desired frequency difference between the two lasers.
Implementation Method 1
the slave laser includes a piezoelectric element... the resonator length of the slave laser changes by expansion and contraction of the piezoelectric element
Data Source
AI summary
A pulse light source includes: a master laser that outputs a master laser light pulse whose repetition frequency is controlled to a predetermined value; a slave laser that outputs a slave laser light pulse; a phase comparator that detects a phase difference between an electric signal having a frequency of the predetermined value, and an electric signal based on a light intensity of the slave laser light pulse; a loop filter; an adder that adds a repetition frequency control signal having a certain repetition cycle, to an output from the loop filter; and a phase comparator that measures a pulse phase difference which is a phase difference between the master laser light pulse and the slave laser light pulse. A magnitude of the repetition frequency control signal is controlled such that the measured pulse phase difference matches with a target value of the pulse phase difference.