Achromatic Beam Shaping Optics for Wide-Band Top-Hat Laser Pulses
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Solution Overview
Problem
Conventional apparatuses for beam shaping of ultra short laser pulses are complex and require precise adjustment for specific wavelengths, making them inefficient for transforming wide band laser radiation into a top-hat profile, especially for wavelengths differing by more than 50 nm.
Innovation Solution
An integrated achromatic optical device with an optically functional transformation boundary surface on a monolithic component, optimized to transform laser radiation from a Gaussian to a top-hat profile for multiple wavelengths, including those differing by over 50 nm, using substrates made of crown and flint glass with specific refractive indices and curvatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional beam shaping apparatuses are used to transform laser radiation into a top-hat profile, then the transformation can be achieved for specific wavelengths, but the apparatus becomes complex and requires precise adjustment for each wavelength combination
Solution Approach 1:
The patent combines multiple optical functions (beam shaping for multiple wavelengths and achromatic focusing) into a single integrated optical element. The transformation boundary surface is formed on one of two substrates that are permanently connected to form a monolithic component, eliminating the need for separate beam shaping optics and achromatic lenses, and removing the need for precise adjustment between components.
Solution Approach 2:
The integrated optical device performs multiple functions simultaneously: it shapes laser radiation into a top-hat profile for at least two different wavelengths (differing by more than 50 nm) and corrects chromatic aberrations. This single element replaces what would traditionally require multiple separate optical components tuned to specific wavelengths.
2Adaptability or versatility
If multiple laser light sources with different wavelengths are combined to achieve wide band laser radiation, then the bandwidth increases, but focal shifts occur that require complex correcting optics
Solution Approach 1:
The patent integrates achromatic focusing capability directly into the beam shaping element. The optical element is designed with specific refractive indices and curvatures that simultaneously provide beam shaping and compensate for chromatic focal shifts across a broad wavelength range, eliminating the need for separate achromatic lens systems.
Solution Approach 2:
The patent uses substrates with specific refractive indices (first substrate: 1.5-1.6, second substrate: 1.6-2.0) and optimized curvatures to achieve both beam shaping and achromatic performance. The transformation boundary surface shape is specifically designed to correct focal shifts for wavelengths differing by more than 50 nm.
3Adaptability or versatility
If conventional beam shaping optics are used for ultra short laser pulses with large bandwidth, then the transformation is ineffective, but the apparatus design becomes even more complex to accommodate the wide bandwidth
Solution Approach 1:
The integrated optical element is designed to handle ultra short laser pulses with large bandwidths (more than 50 nm) by combining beam shaping and achromatic focusing in a single component. The transformation boundary surface is optimized to work effectively across the entire bandwidth of ultra short pulses without requiring additional wavelength-specific optics.
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
The solution enables effective transformation of laser radiation into a top-hat profile for a wide range of wavelengths, including ultra short pulses with large bandwidths, simplifying the design and eliminating the need for precise adjustments between components.
Implementation Method 1
an optically functional transformation boundary surface (4), which has a shape that causes laser radiation (10; 10') passing through the optically functional transformation boundary surface (4) to be transformed
Implementation Method 2
an achromatic optical device (1; 1'), in particular a monolithic component, which comprises a first substrate (2) and a second substrate (3)... optimized to transform laser radiation from a Gaussian to a top-hat profile for multiple wavelengths
Data Source
AI summary
An apparatus for beam shaping of laser radiation in the form of ultra short pulses includes an achromatic optical device comprising a first substrate having a first Abbe number and a second substrate connected to the first substrate and having a second Abbe number that is different from the first Abbe number. The first and second substrates are arranged to allow the laser radiation to at least partially pass through the first and second substrates in succession, wherein an optically functional transformation boundary surface is disposed on one of the first and second substrates. The optically functional transformation boundary surface allows the laser radiation to pass at least partially, such that a profile of the laser radiation is transformed into a top-hat profile.