Burst Mode Laser Source System Thermal Management
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Solution Overview
Problem
Current laser source designs face thermal instability issues, limiting their ability to achieve both high-average power and high-peak power simultaneously, especially at higher repetition rates required for certain applications, which leads to mechanical problems and poor optical performance.
Innovation Solution
A burst mode laser source system with a master clock producing a pulse sequence of wideband light signals, amplified by multiple laser amplifiers in a common optical path, triggered in sequence to achieve high-peak and high-average power over a burst of pumping pulses, with a compressor compressing the amplified pulses to femtosecond range for directed energy applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If power supplies are scaled for thermal loads of high-average power, then thermal stability is improved, but pulse width is limited to a few hundred picoseconds and repetition rate to 50-100 Hz
Solution Approach 1:
The patent implements dynamic power scaling where the laser system adapts its output characteristics in real-time. During pulse bursts, the system delivers high peak power with short pulse widths, then reduces power during inter-pulse intervals. This dynamic operation allows repetition rates in the kilohertz range by continuously adjusting the duty cycle, enabling thermal management to keep pace with higher frequency operations.
2Power
If current laser source design provides higher repetition rate and highest energy per pulse, then peak power is increased, but thermal problems cause optical instability and mechanical problems
Solution Approach 1:
The patent incorporates preliminary thermal management measures by designing the optical path and amplifier stages to anticipate and accommodate thermal loads before they cause damage. This includes pre-cooling mechanisms, thermal shielding, and staged amplification where each stage is designed to handle specific power levels, preventing cumulative thermal damage that would otherwise lead to optical instability and mechanical failure at high repetition rates.
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
The system enables the generation of high-peak and high-average power bursts at higher repetition rates, overcoming thermal limitations and achieving efficient laser-induced radio frequency energy production, suitable for applications requiring transient electric fields in a microwave frequency range.
Implementation Method 1
CPA yield with temporally shorter pulses
Implementation Method 2
laser-induced radio frequency (LIRF) energy
Data Source
AI summary
A device comprising a master clock configured to produce a pulse sequence having a wideband light signal of approximately 800 nanometers or red visible wavelength of a predetermined amplitude. The device comprises X laser amplifiers along a common optical path each amplifier being triggered by a burst of X pulses with high-peak power and high-average power. The X laser amplifiers receive the pulse sequence of the master clock and sequentially amplifying the pulse sequence wherein a last laser amplifier of the X laser amplifiers produces an amplified pulse sequence. A compressor is configured to compress the amplified pulse sequence to produce a laser signal having a sequence of directed energy (DE) pulses each DE pulse having a pulse width in a femtosecond range to induce when striking a solid surface of a target object transient electric fields in a microwave frequency range. A system and method are also provided.