Fiber Laser Module Power Distribution for Stable CARS Light
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Solution Overview
Problem
Existing systems for generating Coherent Anti-Stokes Raman Scattering (CARS) light struggle with instability and noise due to high intensity fluctuations in laser diodes, which affect the precision and stability of the Stokes, pump, and probe lights, making it difficult to achieve synchronized and controlled light sources for effective CARS measurements.
Innovation Solution
The system incorporates a fiber laser module with preamplifiers for each light source and a laser diode power distributor to stabilize the laser power, allowing the laser diode to operate at 90-100% of its designed output level, reducing intensity noise and ensuring synchronized, stable, and precisely controlled light sources for Stokes, pump, and probe lights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common laser diode is used to pump multiple amplifiers without preamplifiers, then the device complexity is reduced, but the intensity noise increases and the stability of light sources deteriorates
Solution Approach 1:
The patent divides the amplification system into separate preamplifier and amplifier stages for each light source (Stokes, pump, and probe lights). Each preamplifier is independently pumped by the common laser diode through a power distributor, isolating the noise from the main amplifier stages. This segmentation allows the common laser diode to operate at stable power levels while each preamplifier provides buffered, stable pumping to its respective amplifier, thereby improving light source stability without requiring multiple independent laser diodes.
Solution Approach 2:
The preamplifier acts as an intermediary between the common laser diode and the main amplifier. It receives pump power from the laser diode through the power distributor and provides stable, buffered pumping to the amplifier. This intermediary stage isolates the amplifier from direct laser diode noise and intensity fluctuations, enabling the laser diode to operate at its optimal power level (90-100% of designed output) while maintaining stable light source output.
2Productivity
If the laser diode operates at high power level (90-100% of designed output), then the productivity and output power are improved, but the intensity noise from the laser diode increases
Solution Approach 1:
The patent extracts the noise-generating function from the main amplification path by introducing separate preamplifier stages. The common laser diode operates at high power levels (90-100% of designed output) to maximize productivity, but the critical amplification that would amplify any noise occurs in the preamplifier stage instead. This extraction allows the laser diode to operate at optimal power levels while the preamplifier provides a stable, buffered pumping signal to the main amplifier, effectively separating the high-power operation from the noise-sensitive amplification process.
3Measurement precision
If multiple independent laser diodes are used for each light source, then the stability and precision of each light source is improved, but the device complexity and cost increase
Solution Approach 1:
The patent merges multiple laser diode pumping functions into a single common laser diode that pumps multiple preamplifiers through a power distributor. Instead of using separate laser diodes for Stokes, pump, and probe lights, one laser diode's output is distributed to three preamplifiers. This merging reduces device complexity and cost while the preamplifier-amplifier architecture maintains the stability and precision that would otherwise require multiple independent laser diodes. The preamplifiers act as buffer stages that decouple the amplified signals from the common pump source, preserving independence and 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
The solution provides stable and synchronized light sources, enabling precise CARS measurements by minimizing intensity noise and ensuring consistent power levels, thereby enhancing the accuracy and reliability of CARS applications.
Implementation Method 1
an oscillator that is configured to output a base laser with mode-locked to be split for generation of the first light source and the second light source
Implementation Method 2
a generator that is configured to generate the first light source by stretching wavelength range of the base laser
Implementation Method 3
a first amplifier that includes a first preamplifier and a first Chirped Pulse Amplification (CPA) unit for the first light source
Implementation Method 4
a second amplifier that includes a second preamplifier and a second CPA unit for the second light source
Implementation Method 5
a LD power distributor that is configured to distribute a laser power from a first laser diode to the oscillator as an oscillation source, to the generator as a pump power, to the first preamplifier as a pump power and to the second preamplifier as a pump power
Data Source
AI summary
A system includes an optical module for supplying a Stokes light, a pump light and a probe light for generating a CARS light. The optical module includes a fiber laser module and an optical plate. The fiber laser module includes an oscillator, a generator, a first amplifier, a second amplifier and a LD power distributor that is configured to distribute a laser power from a first laser diode to the oscillator as an oscillation source, to the generator as a pump power, to the first preamplifier as a pump power and to the second preamplifier as a pump power.