KTN Beam Deflector for Laser Pulse Synchronization
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Solution Overview
Problem
Conventional laser beam combining methods face challenges in precisely controlling and synchronizing a large number of laser beams, particularly due to phase fluctuations and limited spectral bandwidth, which hinders robust and stable operation.
Innovation Solution
A time-division-multiplexing (TDM) approach utilizing a potassium tantalate-niobate (KTN) beam deflector, synchronized with an electric power supply and controller, allows for precise control of laser pulses from an array of pulsed lasers, ensuring they propagate in the same direction and maintaining high beam quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional laser beam combining methods are used, then laser beam modulation and detection can be achieved, but precise control and synchronization of a large number of laser beams is difficult due to phase fluctuations
Solution Approach 1:
The patent employs time-division multiplexing where laser beams from multiple sources are combined in sequential time slots rather than simultaneously. Each laser beam is modulated with a unique time signature, allowing the beam deflector to route them sequentially through the KTN crystal. This periodic time-multiplexed approach eliminates phase synchronization issues while maintaining precise control.
Solution Approach 2:
The system pre-assigns specific time slots and deflection angles to each laser beam source before combination. The controller pre-coordinates the timing of laser pulses with the corresponding deflector angles, ensuring that each beam arrives at the KTN crystal at the precisely scheduled moment with the correct incident angle for its assigned output path.
2Productivity
If a large number of laser beams are combined, then multiplexing capacity increases, but synchronization and control complexity increases
Solution Approach 1:
The patent adds the time dimension to the traditional spatial beam combining approach. Instead of attempting to combine multiple beams simultaneously in space (which requires complex phase and angle control), the system combines beams sequentially in time through the same spatial path. This transforms a complex multi-dimensional spatial control problem into a simpler temporal sequencing problem that can be managed with precise timing control.
Solution Approach 2:
The beam deflector and KTN crystal combination serves as a universal routing element that handles all laser beams from different sources through a single integrated component rather than requiring separate control mechanisms for each beam. The system uses a unified time-division multiplexing scheme that can accommodate any number of laser sources by simply adding more time slots.
3Loss of energy
If traditional beam combining approaches are used, then laser modulation can be achieved, but optical energy efficiency is reduced due to power loss
Solution Approach 1:
The time-division multiplexed beam combining maintains continuous optical path engagement with the KTN crystal, avoiding the start-stop losses associated with mechanical beam switching. The sequential beam routing ensures that the optical energy is continuously directed through the electro-optic medium without interruption or significant reflection losses, preserving optical energy efficiency while combining multiple high-power beams.
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 method enables high multiplexing capacity, robustness, and over 99% optical energy efficiency, effectively combining a large number of laser beams while maintaining spatial quality, with a significant increase in average power.
Implementation Method 1
Potassium tantalate-niobate (KTN) crystals are considered to have a large electro-optic (EO) effect and a variety of methods have been proposed to improve electric-controllable light beam modulation and deflection based on use of a KTN crystal
Data Source
AI summary
A laser beam apparatus can include a set of pulsed lasers (e.g. solid state fiber lasers), a controllable beam deflector, and an electric power supply and controller connected to the beam deflector. The laser pulses from the different pulsed lasers can be configured to hit the beam deflector at different angles and different times. The electric power supply and controller can be configured to control and synchronize the timing and angle at which the different lasers pulses hit the beam deflector with an adjustment of the deflection property of the beam deflector so that the laser pulses from different input directions propagate in the same direction after passing through the beam deflector. The laser pulses from the lasers can be combined together via this control and synchronization.