Interferometer Lens Optic for Phase Stabilization
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Solution Overview
Problem
Conventional optical set-ups for stabilizing the relative phase of short pulses suffer from complexity in adjustment and astigmatism errors due to the use of curved mirrors, which complicates the alignment and introduces optical losses.
Innovation Solution
The optical set-up employs a lens optic to directly image the white light focus into a frequency multiplier device, eliminating the need for curved mirrors and allowing for a compact, simplified design with a periodically poled crystal to prevent phase errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If curved mirrors are used in the optical set-up, then phase stabilization can be achieved, but astigmatism errors and alignment complexity increase
Solution Approach 1:
The patent removes curved mirrors from the optical set-up entirely, extracting the problematic element that caused astigmatism and alignment complexity. Instead of using curved mirrors for beam focusing and steering, the invention employs a flat mirror arrangement combined with a lens in the reference arm, eliminating the source of optical aberrations while maintaining the interferometric functionality for phase stabilization
Solution Approach 2:
The patent introduces a lens as an intermediary element in the reference arm to perform the focusing function that would otherwise require curved mirrors. This lens, combined with flat mirrors, serves as a mediator that achieves the necessary beam manipulation without introducing astigmatism, thereby resolving the contradiction between achieving phase stabilization and avoiding alignment complexity
2Reliability
If curved mirrors are used in the optical set-up, then phase stabilization can be achieved, but optical losses increase
Solution Approach 1:
By removing curved mirrors from the system, the patent eliminates the primary source of optical losses associated with curved mirror surfaces. Flat mirrors have superior reflectivity and lower scattering losses compared to curved mirrors, and the lens-based focusing approach further reduces optical losses by providing aberration-free beam manipulation
Solution Approach 2:
The patent employs standard optical components (flat mirrors and lenses) that are easier to manufacture with higher precision and lower cost compared to curved mirrors. These components have better optical properties with minimal surface defects, resulting in reduced optical losses and improved overall system efficiency for phase stabilization
3Device complexity
If a compact design is implemented, then adjustment complexity is reduced, but precise imaging of white light focus into frequency multiplier device becomes difficult
Solution Approach 1:
The patent combines the focusing and imaging functions into a single lens element in the reference arm. This lens simultaneously focuses the pump beam and images the white light focus onto the frequency multiplier device, merging multiple optical functions into one component. This integration maintains imaging precision while reducing the number of adjustable elements, thereby achieving a compact design with low adjustment complexity
Solution Approach 2:
The lens in the reference arm serves multiple functions: it focuses the pump beam, creates the white light source through nonlinear optical processes, and images the white light focus onto the frequency multiplier device. This multi-functional design eliminates the need for separate optical elements, reducing adjustment complexity while maintaining the precision required for compact interferometer operation
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 minimizes astigmatism, reduces optical complexity, and maintains precise phase stabilization, enabling efficient and stable interferometric superposition of pulse frequency components without the need for complex adjustments.
Implementation Method 1
employs a lens optic to directly image the white light focus into a frequency multiplier device
Implementation Method 2
frequency multiplier device (in particular a frequency doubling crystal)
Data Source
AI summary
A description is given of an optical structure (100), in particular for determining and stabilizing the relative phase of short pulses, which contains a broadening device (6) for broadening the frequency spectrum of pulses of electromagnetic radiation, and a frequency multiplier device (8) for multiplying at least one frequency component of the pulses, wherein a focusing lens optic (7) is arranged between the broadening device and the frequency multiplier device, which focusing lens optic can be used to focus the pulses into the frequency multiplier device (8). Uses of this optical structure are also described.