Laser Pulse Amplifier with Tilted Front Face and Prism
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Solution Overview
Problem
High-power laser amplification devices face challenges in achieving effective thermal management and maintaining temporal contrast due to parasitic reflections, which degrade the quality of the pulsed laser beam, especially in systems operating above 10 watts.
Innovation Solution
A solid-state laser amplification device with a tilted front face and a trapezoidal prism is used for cooling the amplifying medium by the rear face, separating parasitic reflections spatially from the main pulse, and a compensating prism is employed to ensure parallel output beams of different wavelengths, preserving the multi-wavelength nature and enhancing thermal extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If rear face cooling is used to increase thermal extraction, then thermal management is improved, but temporal contrast is degraded due to parasitic reflections
Solution Approach 1:
The patent extracts and removes parasitic reflections from the optical path by using a tilted front face that directs these reflections away from the main beam path. This separation eliminates the harmful effect of parasitic reflections on temporal contrast while preserving the beneficial thermal extraction from rear face cooling.
Solution Approach 2:
The front face is tilted at an asymmetric angle relative to the rear face, creating an asymmetric optical path that separates parasitic reflections from the main beam. This asymmetric geometry allows the laser beam to pass through while deflecting parasitic reflections away from the detection path, thereby preserving temporal contrast.
2Object-affected harmful factors
If a tilted front face is used to separate parasitic reflections, then temporal contrast is improved, but spatial separation of wavelengths is introduced
Solution Approach 1:
A compensating optical element (such as a prism or another tilted interface) is introduced as an intermediary to correct the spatial separation of wavelengths caused by the tilted front face. This compensating element realigns the different wavelength components to be parallel with each other, maintaining beam quality while preserving the temporal contrast improvement.
3Object-affected harmful factors
If conventional cooling methods are used, then temporal contrast is maintained, but thermal management becomes insufficient for high power operation
Solution Approach 1:
The patent extracts parasitic reflections from the optical path using a tilted front face, thereby removing the harmful effect that previously prevented effective rear face cooling. This extraction enables the implementation of rear face cooling in high-power operations without compromising temporal contrast.
Solution Approach 2:
The patent changes the geometric parameter of the front face (tilting it relative to the rear face) to enable simultaneous achievement of effective thermal management through rear face cooling and maintenance of temporal contrast by separating parasitic reflections from the main beam path.
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 configuration effectively improves thermal management and maintains high temporal contrast, ensuring the quality of the pulsed laser beam by spatially separating parasitic reflections and achieving parallel output beams, thus addressing the limitations of existing high-power laser systems.
Implementation Method 1
the front face of the medium is tilted relative to its rear face by a first non-zero tilt... the beams of each wavelength are parallel to one another at the output of the prism
Implementation Method 2
a reflecting rear face... the beam to be amplified 2 arrives on the amplifying medium 1 with an angle of incidence φi according to the front view
Implementation Method 3
a trapezoidal prism of refractive index n2, with an input face and an output face which form between them a second non-zero tilt... the beams of each wavelength are parallel to one another at the output of the prism
Implementation Method 4
a device for cooling the amplifying medium by the rear face... The cooling can be obtained by means of a fluid, liquid or gas, or a solid
Implementation Method 5
The cooling can be obtained by means of a fluid, liquid or gas... This cooling by the rear face makes it possible to increase the heat exchange surface area
Data Source
AI summary
A device for amplifying a multi-wavelength pulsed laser beam is provided, which comprises: a solid amplifying medium with two planer faces, a front face and a reflecting rear face; and a device for cooling the amplifying medium by the rear face. The front face of the amplifying medium is tilted relative to its rear face by a first non-zero tilt and the device further comprises a trapezoidal prism, with an input face and an output face which form between them a second non-zero tilt, the first and second tilts being such that the beams of each wavelength are parallel to one another at the output of the prism.