Nonlinear Crystal Layout Within Rayleigh Length for Wavelength Conversion
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Solution Overview
Problem
Existing wavelength conversion systems face challenges in efficiently arranging nonlinear optical crystals due to hygroscopicity and the need for longer optical path lengths, leading to reduced efficiency and flexibility in design.
Innovation Solution
The proposed solution involves arranging nonlinear optical crystals within the Rayleigh length of the beam waist positions, using a light concentrating optical system to position the crystals optimally, and employing alternative polarization direction change methods like periscope mirrors to enhance efficiency and flexibility without relying on relay lens systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nonlinear optical crystals are arranged with longer optical path lengths to address hygroscopicity, then reliability is improved, but wavelength conversion efficiency deteriorates
Solution Approach 1:
The patent changes the spatial parameter arrangement by positioning multiple nonlinear optical crystals within the Rayleigh length range of the beam waist position, rather than using longer optical path lengths. This parameter change maintains crystal stability while optimizing wavelength conversion efficiency through compact arrangement.
Solution Approach 2:
The patent transitions from a linear optical path arrangement to a three-dimensional compact arrangement where crystals are positioned within the Rayleigh length volume around the beam waist. This dimensional reorganization allows simultaneous achievement of stability and efficiency.
2Ease of manufacture
If relay lens systems are used to arrange nonlinear optical crystals, then ease of manufacture is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the relay lens system from the optical path, directly positioning nonlinear optical crystals within the Rayleigh length of the beam waist. This removal simplifies the overall device structure while maintaining manufacturing feasibility through precise crystal placement.
3Ease of operation
If multiple nonlinear optical crystals are arranged outside the Rayleigh length, then ease of operation is improved, but wavelength conversion efficiency deteriorates
Solution Approach 1:
The patent optimizes the spatial parameter by positioning crystals within the Rayleigh length range, changing the arrangement parameter from 'outside Rayleigh length' to 'within Rayleigh length'. This enables both efficient wavelength conversion and simplified operation through direct beam interaction.
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 approach improves wavelength conversion efficiency and design flexibility by allowing multiple nonlinear optical crystals to be placed within the Rayleigh length, reducing the need for relay lenses and minimizing thermal effects.
Implementation Method 1
a first nonlinear optical crystal which first light having a first wavelength enters and from which second light having a second wavelength and being a second harmonic of the first light is output
Implementation Method 2
a second nonlinear optical crystal which the second light and third light having a third wavelength enter and from which the third light and fourth light having a fourth wavelength and being sum frequency light of the second light and the third light are output
Implementation Method 3
a third nonlinear optical crystal which the third light and the fourth light enter and from which fifth light having a fifth wavelength and being sum frequency light of the third light and the fourth light is output
Implementation Method 4
a light concentrating optical system configured to cause the first light to enter the first nonlinear optical crystal so that a beam waist position of the second light is located in the second nonlinear optical crystal
Data Source
AI summary
A wavelength conversion system includes a first nonlinear optical crystal which first light having a first wavelength enters and from which second light having a second wavelength is output, a second nonlinear optical crystal which the second light and third light having a third wavelength enter and from which the third light and fourth light having a fourth wavelength are output, a third nonlinear optical crystal which the third light and the fourth light enter and from which fifth light having a fifth wavelength is output, and a light concentrating optical system configured to cause the first light to enter the first nonlinear optical crystal. Here, the first nonlinear optical crystal is located in a range within a Rayleigh length of the second light, and the third nonlinear optical crystal is located in a range within a Rayleigh length of the fourth light.