Secondary Laser Beam Wave Front Control in PTR Glass
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Solution Overview
Problem
Laser systems face inefficiencies due to optical aberrations introduced by thermal gradients in optical elements, which reduce beam quality and require complex and costly thermal control systems, especially in small laser cavities.
Innovation Solution
A laser system that uses a secondary laser beam to thermally contract or expand optical elements, including a doped PTR glass optical element, to alter the wave front of a primary laser beam, minimizing aberrations through spatial modulation and controlled thermal regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If thermal control systems (cooling systems, radially symmetric gain rods with radial cooling) are used to reduce thermal gradients and optical aberrations, then optical aberrations are reduced, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical thermal control systems (cooling plates, thermal conduits, radially symmetric gain rods with cooling systems) with an optical solution: using a secondary laser beam to induce thermal contraction or expansion in the laser medium or optical elements, thereby controlling the wave front of the primary laser beam. This substitutes a complex mechanical thermal management system with a more compact optical-thermal control mechanism.
2Object-affected harmful factors
If fixed corrector plates or complex adaptive optical systems are used to cancel optical aberrations, then beam quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces fixed corrector plates and complex adaptive optical systems with a secondary laser beam that directly modifies the thermal state of the laser medium or optical elements. This optical-thermal approach eliminates the need for separate mechanical correction components, reducing system complexity while maintaining aberration correction capability.
3Stability of the object's composition
If thermal systems with large thermoelectric coolers and cold plates are used to control PTR optical element temperature, then temperature stability is improved, but device size and complexity increase
Solution Approach 1:
The patent replaces bulky thermal systems (large thermoelectric coolers, cold plates, water cooling infrastructure) with a compact secondary laser beam that optically induces thermal contraction or expansion in the PTR optical element. This eliminates the need for large mechanical thermal control components, enabling integration in small laser cavities and vacuum chambers while maintaining temperature stability.
4Temperature
If PTR optical element is cooled from outer edge with thermal control system to reduce temperature increase, then temperature control is achieved, but temperature gradients are introduced that adversely impact efficiency
Solution Approach 1:
The patent applies local quality by using a spatially modulated secondary laser beam that selectively targets specific regions of the PTR optical element or laser medium. The secondary beam can be focused or patterned to create localized thermal contraction or expansion in precise areas, allowing controlled wave front modification without introducing unwanted temperature gradients that would reduce optical element efficiency.
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 effectively reduces optical aberrations, improving beam quality and reducing thermal gradients, thereby enhancing the performance of the laser system while simplifying the thermal control infrastructure and reducing costs.
Implementation Method 1
selectively cause portions of a laser medium or other optical element to thermally contract or expand in order to correspondingly alter the wave front of the primary laser beam
Implementation Method 2
a spatial light modulator configured to receive the secondary laser beam and to spatially modulate the secondary laser beam to create a spatially modulated secondary laser beam having a spatial intensity pattern
Implementation Method 3
A PTR glass optical element may include a dopant responsive to a secondary laser beam such that exposure of the PTR glass optical element to the secondary laser beam may be utilized in order to modify the temperature of the doped PTR glass optical element
Data Source
AI summary
A laser system and associated method are provided for controlling the wave front of a primary laser beam. The laser system includes a laser medium for producing a primary laser beam and at least one optical element to which the primary laser beam is directed. The laser system also includes a secondary laser source for producing a secondary laser beam. The laser system may further include a spatial light modulator configured to receive the secondary laser beam and to spatially modulate the secondary laser beam to create a spatially modulated secondary laser beam having a spatial intensity pattern. The spatially modulated secondary laser beam may impinge upon at least one of the laser medium or the at least one optical element in order to selectively modify the temperature of portions of the laser medium or the at least one optical element upon which the spatially modulated secondary laser beam impinges.