Monolithic Double Diffractive Kinoform Doublet for Broadband Detection
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Solution Overview
Problem
Conventional optical detection apparatuses with diffractive elements are inefficient for broadband detection as their performance degrades significantly when the wavelength deviates from the peak wavelength, making them unsuitable for applications requiring a wide range of frequencies.
Innovation Solution
An optical element comprising a first and second lens with different refractive indices and surface configurations, including multiple facets connected by passive facets, optimized for peak diffraction efficiency at two distinct wavelengths, allowing for improved performance across a broader spectral range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional diffractive element is used to focus optical beams, then it achieves high diffraction efficiency at a particular wavelength, but performance degrades significantly when the wavelength deviates from the peak wavelength
Solution Approach 1:
The optical element is divided into multiple discrete facets on each surface instead of continuous surfaces. The first surface has multiple facets and the second surface has multiple facets, creating a segmented structure that enables independent optimization for different wavelengths. This segmentation allows each facet to be tailored for specific wavelength ranges, resolving the contradiction between peak efficiency and broadband adaptability.
Solution Approach 2:
Different facets are designed with different local properties - each facet can have optimized dimensions, orientations, and spacing tailored to specific wavelength ranges. The passive facets connecting active facets provide physical offsets that further customize the local optical path. This local quality variation across the surface enables the element to maintain high efficiency across multiple wavelengths simultaneously.
2Reliability
If diffractive elements are designed for narrow band operation, then they achieve optimal performance at peak wavelength, but they are unsuitable for broadband detection applications
Solution Approach 1:
The optical element is designed to perform multiple functions by maintaining peak diffraction efficiency at multiple distinct wavelengths simultaneously. The combination of multiple facets on both surfaces, with different refractive indices, creates a universal element that can handle broadband detection tasks while preserving reliability at each target wavelength. This multi-functionality directly addresses the contradiction between consistency and adaptability.
Solution Approach 2:
The element utilizes composite structural design combining multiple facets with different geometric properties and materials with different refractive indices. This composite approach allows the element to exhibit tailored optical responses across different wavelength ranges, achieving both reliable performance consistency and broadband adaptability that single-material designs cannot achieve.
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 optical element achieves peak diffraction efficiency at two different wavelengths, enhancing its performance and adaptability for broadband detection applications by maintaining efficiency across a wider range of wavelengths.
Implementation Method 1
peak diffraction efficiency at a first wavelength and at a second wavelength
Implementation Method 2
The first lens has a first refractive index and a first power. The second lens has a second refractive index different from the first refractive index
Data Source
AI summary
A monolithic double diffractive kinoform doublet and a method for making such optical element is disclosed. In one embodiment, the optical element includes a first lens and a second lens. The first lens has a first refractive index. The first lens also has a first surface and a second surface. The first surface is a continuous, potentially flat surface for optical radiation to enter. The second lens has a second refractive index different from the first refractive index. The second lens has a first surface and a second surface. The first surface is in contact with the second surface of the first lens. The optical element has a peak diffraction efficiency at a first wavelength and at a second wavelength different than the first wavelength.