Fluid-Filled Hollow-Core OPO for Wideband Frequency Tunability
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Solution Overview
Problem
Existing tuneable light sources, particularly in the ultraviolet region, are inefficient, bulky, and require complex frequency conversion schemes, leading to high pump power requirements, heat generation, and limited lifetime, while existing fibre-optic parametric oscillators struggle with tunability, frequency limitations, and power constraints.
Innovation Solution
An optical parametric oscillator system using a fluid-filled hollow-core optical waveguide with an optical feedback arrangement to recycle signal and idler light, enabling efficient conversion of pump light into signal and idler light via a third-order non-linear optical effect, allowing wide tunability and high power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If second order non-linear optical materials are used in OPOs, then coherent light can be generated, but the frequency is limited to lower than the pump light frequency
Solution Approach 1:
The patent changes the fundamental parameter of the non-linear optical effect from second order to third order, enabling frequency generation above the pump frequency and expanding the adaptable frequency range to include ultraviolet and short visible spectrum regions
Solution Approach 2:
The patent introduces hollow-core optical fibres as an intermediary medium to enable third order non-linear optical effects, serving as a mediator between the pump light source and the desired high-frequency output that cannot be achieved directly with conventional second order materials
2Adaptability or versatility
If additional frequency conversion steps are used to generate higher frequencies, then ultraviolet spectral region can be reached, but lifetime and efficiency are reduced
Solution Approach 1:
The patent extracts the frequency conversion process from multiple sequential steps into a single direct third order non-linear optical conversion step, eliminating the need for additional conversion stages and their associated reliability issues
Solution Approach 2:
Instead of using multiple conversion steps from low to high frequency (the conventional approach), the patent inverts the approach by using third order non-linear optics to directly generate high frequencies from the pump light in a single step
3Stability of the object's composition
If solid-core optical fibres are used in FOPOs, then phase-matching can be achieved, but tunability and wavelength range are limited
Solution Approach 1:
The patent uses composite hollow-core optical fibre structures combining different core materials (gases, liquids, or vacuum) with specific cladding designs to achieve both phase-matching and broad wavelength tunability simultaneously, overcoming the limitations of solid-core fibres
Solution Approach 2:
The patent introduces dynamic tuning capability by allowing changes in the hollow-core fibre's core material composition, pressure, or temperature, enabling real-time adjustment of phase-matching conditions and output wavelengths that cannot be achieved with fixed solid-core structures
4Adaptability or versatility
If hollow-core fluid-filled optical waveguide is used, then wide tunability and high power levels can be achieved, but system complexity increases
Solution Approach 1:
The hollow-core optical fibre serves multiple functions simultaneously: it provides the non-linear optical medium for third order effects, enables phase-matching through its hollow-core structure, allows dynamic tuning via fluid control, and supports high power levels, reducing the need for separate components
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 system achieves wide tunability across the ultraviolet, visible, and infrared regions with high power efficiency and extended lifetime, overcoming limitations of existing technologies by using a fluid-filled hollow-core optical fibre for efficient frequency conversion.
Implementation Method 1
the optical waveguide is configured to receive pump light and to convert the pump light into signal light and idler light via a third order non-linear optical effect
Implementation Method 2
The optical waveguide may be configured to convert the pump light into the signal light and the idler light via four-wave mixing
Data Source
AI summary
An optical parametric oscillator (OPO) system comprises an optical waveguide including a hollow core containing a fluid, wherein the optical waveguide is configured to receive pump light and to convert the pump light into signal light and idler light via a third order non-linear optical effect. The OPO system further comprises an optical feedback arrangement for recycling at least a portion of the signal light and/or for recycling at least a portion of the idler light in an optical cavity that includes the optical waveguide. The OPO system may be used, in particular though not exclusively, in metrology, gas and solid-state spectroscopy, laser-assisted manufacturing, semiconductor technology, biomedicine, healthcare, and scientific laboratory use.