Nonlinear Optical System Time Delay Modulation for Pulse Train Control
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Solution Overview
Problem
Current nonlinear optical systems for generating or amplifying high power and high energy light pulses face limitations in controlling the rate of pulse trains, as modifying the firing frequency before the nonlinear optical medium can degrade the output beam characteristics and placing optical modulators at the output results in power losses and speed limitations.
Innovation Solution
A nonlinear optical system with a time delay modulation device upstream of the nonlinear optical medium, allowing for rapid switching between different delay values to control the overlap of light pulses, thereby modulating the generation or amplification of pulses by N-wave mixing without power losses or affecting pulse characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the firing frequency is modified before the nonlinear optical medium, then the pulse train rate is controlled, but the output beam characteristics are degraded
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing multiple laser sources before they enter the nonlinear optical medium. The synchronization is established in advance through precise timing control of pulse generation, ensuring that pulses from different sources arrive simultaneously at the medium. This preliminary synchronization enables pulse train rate control while preserving output beam characteristics, as the nonlinear conversion process receives properly timed inputs without requiring frequency modification that would degrade beam quality.
2Ease of operation
If optical modulators are placed at the output of the nonlinear optical medium, then the pulse train is controlled, but power losses occur and speed is limited
Solution Approach 1:
The patent implements preliminary action by establishing pulse synchronization and timing control before the pulses enter the nonlinear optical medium. Multiple laser sources are pre-synchronized to generate pulses at the desired repetition rate, and this synchronization is maintained throughout the optical paths. By performing the control action preliminarily rather than modulating at the output, the system avoids power losses associated with output modulators while achieving the same pulse train control objective.
3Ease of operation
If optical modulators are placed at the output of the nonlinear optical medium, then the pulse train is controlled, but the modulation speed is limited
Solution Approach 1:
The patent applies preliminary action by implementing synchronization control at the pulse generation stage, before the pulses enter the nonlinear optical medium. The timing and repetition rate of pulses from multiple laser sources are predetermined and precisely controlled in advance. This preliminary control approach enables fast modulation speeds because the timing is established at the source level rather than requiring slow modulation of the already-generated pulses at the output, thus achieving rapid pulse train control without the speed limitations of output modulators.
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
Enables precise control over the output pulse train rate, allowing for on-demand pulse generation from maximum rate to single pulse extinction, with no power loss and independence from pulse duration or wavelength, while maintaining pulse quality.
Implementation Method 1
A nonlinear optical system for generating or amplifying light pulses by N-wave mixing, where N represents a natural number greater than or equal to three
Implementation Method 2
the three-wave mixing, where a transfer of energy takes place between three electromagnetic waves interacting in a non-linear medium
Implementation Method 3
the four-wave mixing, where a transfer energy takes place between four electromagnetic waves interacting in a non-linear medium
Implementation Method 4
Three-wave mixing finds, among other things, applications in frequency summing, in particular frequency doubling, frequency difference and optical parametric amplification
Implementation Method 5
a device for modulating a time delay between the second light pulse and the first light pulse in the nonlinear optical medium
Implementation Method 6
A pump beam 52 composed of high energy pulses is sent into a nonlinear optical medium 20 to be combined with a signal beam 51 of lower energy. Under certain conditions, and in particular of spatial and temporal superposition of the pulses of the pump beam 12 and of the signal beam 11 in the nonlinear optical medium 20, a transfer of energy can occur from the pump beam 12 to the signal beam 11
Data Source
Figure 1~3
Figure 4~7
AI summary
The invention relates to a nonlinear optical system for generating or amplifying light pulses by N-wave mixing, including a nonlinear optical medium (20) suitable for receiving at least one first light pulse (51) and one second light pulse (52, 522). According to the invention, the system includes a fast modulating device (40) for modulating a time delay between the second light pulse (52) and the first light pulse (51) in the nonlinear optical medium (20), the device (40, 41, 42) for modulating time delay being placed upstream of the nonlinear optical medium (20), and the device (40, 41, 42) for modulating time delay being modulatable at least between a first delay value (R1) and a second delay value (R2), so as to modulate the generation or amplification of a light pulse (60) by N-wave mixing of said at least one first light pulse (51) and one second light pulse in the nonlinear optical medium (20).