Divided Pulse Laser Cavity for High-Energy Output
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Solution Overview
Problem
Conventional short-pulse lasers are limited by nonlinear phase shift accumulation, restricting the pulse energy that can be produced, and external amplification methods introduce noise and complexity.
Innovation Solution
The implementation of divided-pulse lasers with optical dividing and recombining elements within the laser cavity to divide pulses into sub-pulses, amplify them, and recombine them into a single pulse with increased energy, mitigating nonlinear effects and reducing noise by performing these operations internally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional short-pulse lasers are used to increase pulse energy, then pulse energy is improved, but nonlinear phase shift accumulation increases which limits further energy increase
Solution Approach 1:
The laser pulse is divided into multiple sub-pulses using optical dividing elements (such as birefringent crystals or beam splitters) arranged in series. Each sub-pulse carries a fraction of the total pulse energy, thereby reducing the energy-dependent nonlinear phase shift in each individual sub-pulse while maintaining the capability to reconstruct the full energy pulse through coherent recombination.
Solution Approach 2:
Multiple optical dividing elements are nested in series within the laser cavity, with each element further subdividing the pulse into additional sub-pulses. This nested structure enables progressive energy division while maintaining temporal coherence, allowing the system to scale to higher pulse energies by adding more dividing stages.
2Use of energy by moving object
If external amplification methods are used to increase pulse energy, then pulse energy is improved, but noise and system complexity increase
Solution Approach 1:
The pulse division, amplification, and recombination functions are merged into a single integrated laser cavity system. The optical dividing elements and gain medium work together within the same resonator, eliminating the need for separate external amplification stages and reducing overall system complexity while maintaining low noise through coherent intra-cavity operation.
Solution Approach 2:
The laser cavity serves multiple functions simultaneously: it generates the laser pulses, divides them into sub-pulses, amplifies the sub-pulses through the gain medium, and recombines them into the final high-energy pulse. This multi-functional design eliminates the need for separate dedicated amplification systems.
3Use of energy by moving object
If external amplification methods are used to increase pulse energy, then pulse energy is improved, but noise increases
Solution Approach 1:
The laser system performs its own amplification internally through the gain medium within the cavity, eliminating the need for external amplifiers that would introduce additional noise. The divided sub-pulses are amplified by the same laser medium that generated them, maintaining coherence and minimizing noise addition.
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 approach significantly enhances pulse energy, achieving up to 16-times increase in pulse energy with minimal duration change and offering low-noise, high-energy pulses suitable for applications like stimulated Raman scattering microscopy and material processing.
Implementation Method 1
The set of optical dividing elements is configured to divide a laser pulse from the laser gain medium into a sequence of temporally spaced sub-pulses
Implementation Method 2
A laser is a device that emits light or electromagnetic radiation with a high degree of spatial and temporal coherence through a process of optical amplification based on the stimulated emission of photons
Data Source
AI summary
Methods, systems, and devices are disclosed for divided-pulse lasers. In one aspect, a pulsed laser is provided to include a laser cavity including an optical amplifier and a plurality of optical dividing elements and configured to direct a laser pulse of linearly polarized light into the plurality of optical dividing elements to divide the light of the laser pulse into a sequence of divided pulses each having a pulse energy being a portion of the energy of the laser pulse before entry of the optical dividing elements, to subsequently direct the divided pulses into the optical amplifier to produce amplified divided pulses. The laser cavity is configured to direct the amplified divided pulses back into the plurality of optical dividing elements for a second time in an opposite direction to recombine the amplified divided pulses into a single laser pulse with greater pulse energy as an output pulse of the laser cavity.