Nonlinear Crystal Optical Arrangement for Incoherent Light
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Solution Overview
Problem
Existing laser systems are unable to process incoherent light effectively, leading to limitations in imaging spatially extended sources and requiring energy-inefficient methods to produce high-quality laser beams.
Innovation Solution
An arrangement comprising a focusing system, a cavity with an intra-cavity laser beam, and a quasi-phase matched nonlinear crystal that interacts with focused incoherent electromagnetic radiation to produce processed radiation in a different wavelength interval, enabling imaging and improving beam quality through sum or difference frequency generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a prior art laser system with nonlinear crystal is used for wavelength conversion, then wavelength conversion can be achieved, but the system cannot process incoherent light from spatially extended sources
Solution Approach 1:
The patent introduces a scanning unit as an intermediary component that sequentially directs light from different spatial positions of the extended source to the nonlinear crystal. This mediator enables the system to accept incoherent light from spatially extended sources by converting the spatial distribution into temporal sequence, allowing each point source to be processed individually while maintaining overall system functionality.
2Manufacturing precision
If spatial filtering through pinhole or coupling to single-mode fiber is used to produce high quality laser beam, then beam quality is improved, but significant power loss occurs
Solution Approach 1:
The patent replaces the mechanical spatial filtering approach (pinholes and single-mode fibers) with a scanning system that uses a nonlinear crystal for frequency conversion. Instead of physically blocking and selectively transmitting beams, the system uses a scanning mirror to sequentially direct different spatial positions to the crystal, achieving beam quality improvement through controlled spatial selection without the energy loss of physical filtering.
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 solution allows for efficient imaging and high-quality beam generation from incoherent sources, overcoming previous limitations by achieving high conversion efficiency and improving spatial quality of the processed radiation.
Implementation Method 1
The nonlinear crystal is configured to be quasi phase matched for conversion of the incoming incoherent electromagnetic radiation in the first wavelength interval to the processed electromagnetic radiation in the second wavelength interval
Implementation Method 2
by interaction with the intra-cavity laser beam provide processed electromagnetic radiation... through sum or difference frequency generation
Implementation Method 3
a focusing arrangement for focusing the incoming incoherent electromagnetic radiation
Data Source
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AI summary
Processing of incoherent electromagnetic radiation is described, said incoming incoherent electromagnetic radiation comprising radiation in a first wavelength interval. An arrangement comprises a focusing arrangement for focusing the incoming incoherent electromagnetic radiation, a first cavity configured to comprise an intra cavity laser beam, a nonlinear crystal arranged in the first cavity such that it is capable of receiving the focused incoherent electromagnetic radiation and, in dependence on the spatial overlap between the focused incoherent electromagnetic radiation and the intra-cavity laser beam, by interaction with the intra-cavity laser beam provide processed electromagnetic radiation, said processed electromagnetic radiation comprising radiation in a second wavelength interval. In other words, such an arrangement is capable of enabling imaging, e.g. by utilizing a detector that is sensitive in the second wavelength interval, a source of radiation that emits incoherently in a first wavelength interval.