Single-Material Parametric Wavelength Converter With Pump Reuse
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Solution Overview
Problem
Existing parametric laser sources require multiple nonlinear optical materials and stringent laser alignment, leading to waste of pump-laser energy and increased costs, due to multi-stage wavelength conversion processes.
Innovation Solution
A parametric laser-wavelength converter that reuses and regenerates the pump-laser pulse within a single nonlinear optical material, employing reflective elements to redirect the partially depleted pump-laser pulse for efficient difference frequency generation, eliminating the need for additional materials and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a multiple-pump-laser and multiple-material scheme is used to generate high-power frequency-down-converted output, then the idler laser power can be increased, but the system complexity and cost increase due to requiring two expensive pump-laser pulses and two expensive nonlinear optical materials
Solution Approach 1:
The patent merges the optical parametric amplification (OPA) and difference-frequency generation (DFG) processes into a single nonlinear optical material. The signal laser and reused pump laser interact within the same material to generate the idler, eliminating the need for separate materials and reducing system complexity while maintaining high idler power output.
Solution Approach 2:
The patent recovers and reuses the partially depleted pump laser pulse that would otherwise be discarded after the first OPA process. By reflecting this residual pump pulse back into the nonlinear optical material to interact with the reflected signal laser, the system extracts additional energy to generate high-power idler output, improving overall energy efficiency.
2Power
If a multiple-material scheme is employed for parametric amplification and difference-frequency generation, then high-power idler laser can be generated, but the cost increases due to requiring two expensive nonlinear optical materials
Solution Approach 1:
The patent combines both OPA and DFG processes within a single nonlinear optical material, eliminating the need for two separate materials. This merging approach reduces material costs and simplifies the system architecture while achieving the same high-power idler generation objective.
Solution Approach 2:
The single nonlinear optical material performs multiple functions: it first acts as the medium for optical parametric amplification to generate the signal laser, then serves as the medium for difference-frequency generation when the reused pump laser interacts with the reflected signal laser. This multi-functionality eliminates the need for specialized materials for each process.
3Power
If a multi-stage laser-wavelength conversion process is used, then the idler laser can be generated through parametric amplification and difference-frequency generation, but stringent laser alignment is required
Solution Approach 1:
The patent merges the alignment requirements of two separate stages into a single alignment process. Since both OPA and DFG occur in the same nonlinear optical material, only one precise alignment is needed to ensure all laser beams (pump, signal, and idler) properly intersect within the material, significantly easing the operational complexity.
4Device complexity
If the pump-laser pulse is not reused after parametric amplification, then the process is simple, but the pump-laser energy is wasted and efficiency is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the partially depleted pump laser pulse is reflected back into the nonlinear optical material to interact with the reflected signal laser. This recovery process extracts additional energy from the pump pulse to generate high-power idler output, converting what would be wasted energy into useful output and improving overall system efficiency.
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
Reduces costs by eliminating the need for a second nonlinear optical material and simplifies the laser alignment process, while achieving high-power idler laser generation with improved efficiency.
Implementation Method 1
The nonlinear optical material is configured to receive the pump-laser pulse and generate a signal-laser pulse at a second frequency and a partially depleted pump-laser pulse through optical parametric amplification
Implementation Method 2
The nonlinear optical material is configured to receive the reflected signal-laser pulse and the re-used partially depleted pump-laser pulse to generate an idler-laser output at a third frequency through difference frequency generation
Implementation Method 3
The first optical reflective element is disposed on a path of the amplified signal-laser pulse and configured to reflect the signal-laser pulse back to the same nonlinear optical material
Data Source
AI summary
A single-material-double-process parametric laser-wavelength converter includes a pump-laser source, a nonlinear optical material, a first optical reflective element, and a second optical reflective element. The pump-laser source is configured to emit a pump-laser pulse light. The nonlinear optical material receives the pump-laser pulse and generates a signal-laser pulse and a partially depleted pump-laser pulse through optical parametric amplification. The first optical reflective element is configured to reflect the signal-laser pulse back to the same nonlinear optical material. The second optical reflective element is configured to reflect the partially depleted pump-laser pulse back to the same nonlinear optical material. With an appropriate adjustment on the reflecting path lengths, the nonlinear optical material is configured to receive the temporally synchronized signal-laser pulse and the partially depleted pump-laser pulse to generate an idler output through difference frequency generation. Both optical parametric amplification and difference frequency generation occur in the same nonlinear optical material.