Pulsed Beam Phase Locking via Parametric Amplification Feedback
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Solution Overview
Problem
Existing methods for generating squeezed light suffer from high fabrication costs, increased circuit complexity, and deteriorating phase stability due to frequency separation between beams, particularly in the terahertz range.
Innovation Solution
A method and system for generating pulsed optical beams using a pump source with a generation module, modulation module, and detection module, where the beams are phase-locked through a parametric process in a non-linear optical medium, utilizing error correction signals to maintain phase relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional phase locking methods are used to maintain phase relationships between three pulsed light beams, then phase stability can be maintained at low frequency separations, but the system suffers from high fabrication cost, increased circuit complexity, and deteriorating phase stability when frequency separation increases to the terahertz range
Solution Approach 1:
The patent extracts and eliminates the need for optical frequency combs and additional phase locking circuits by using a single mode-locked laser source. The phase relationship is maintained through the inherent temporal structure of the pulse train rather than complex external control circuits, thereby reducing device complexity while maintaining phase stability.
Solution Approach 2:
The system uses self-phase locking where the phase relationship between pulses is automatically maintained by the regenerative feedback mechanism within the mode-locked laser cavity. The laser self-regulates its pulse timing and phase relationships without requiring external phase locking circuits or additional control elements.
2Reliability
If traditional phase locking methods with additional lasers and optical frequency combs are employed, then phase relationships can be maintained, but fabrication cost increases significantly
Solution Approach 1:
The patent merges the functions of multiple lasers and frequency combs into a single mode-locked laser source. The single laser simultaneously generates all required pulses with correct phase relationships through its internal cavity dynamics, eliminating the need for separate laser sources and frequency comb generation equipment, thereby reducing fabrication cost.
Solution Approach 2:
The single mode-locked laser performs multiple functions: it generates the pump pulses, maintains phase relationships through its cavity structure, and provides the temporal synchronization for all three beams. This multi-functional approach eliminates the need for multiple specialized components, reducing both fabrication cost and system complexity.
3Speed
If beams are separated by large frequency differences in the terahertz range, then spectral distinction is improved, but phase stability deteriorates with existing phase locking methods
Solution Approach 1:
The phase relationships are established in advance during the pulse generation process within the mode-locked laser cavity, before the pulses are used for squeezing. The cavity structure pre-configures the correct phase relationships, ensuring stability even when the frequency separation between pulses is large, thereby enabling terahertz-range frequency separation while maintaining phase stability.
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
Achieves improved phase-locking capabilities with reduced complexity and cost, maintaining phase stability across wider frequency separations without the need for additional lasers or optical frequency combs.
Implementation Method 1
a detection module configured to: parametrically amplify a portion of the combined pulsed optical beam, where an amplification gain is proportional to a phase difference between the first, second, and third modulated light beams
Implementation Method 2
the nonlinear optical medium characterized by a non-linear optical susceptibility, wherein the portion of the pulsed beam is parametrically amplified within the optical medium
Implementation Method 3
Any of the above aspects may further comprise a phase modulator on the one of the first, second, and third modulation paths, wherein the phase modulation is driven by the error correction signal to apply the phase adjustment.
Data Source
AI summary
A pump source configured to generate a pulsed optical beam. The pump source generates a first light beam, a second light beam, and a third light beam, where the first, the second, and the third light beams satisfy a phase relationship. Each of the first, the second, and the third light beams are independently modulated in separate modulation paths and recombined as a pulsed optical beam. A portion of the pulsed optical beam is parametrically amplified within a nonlinear optical medium, where a resulting amplification gain is proportional to a phase difference between the first, second, and third modulated light beams. The power value of the amplified beam is measured as an indication of the phrase difference between the three beams and a corrective phase adjustment based on the error correction signal is applied on any one of the first, second, and third modulation paths to maintain the phase relationship.