Wavelength Converting Device With Thinner Portions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wavelength converting devices face challenges in achieving high output power due to optical damage and limited conversion efficiency, particularly when attempting to oscillate second harmonic waves with high power levels.
Innovation Solution
A wavelength converting device is designed with a substrate having a wavelength converting portion and thinner portions on either side, featuring a cross-sectional area between 0.0001 mm² and 0.01 mm², which allows for a larger cross-sectional area and improved conversion efficiency while preventing optical damage, using a periodic domain inversion structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a periodic polarization domain inversion structure is formed in a ridge-type optical waveguide, then conversion efficiency is improved, but optical damage occurs at output powers of 200 mW or more
Solution Approach 1:
The patent changes the cross-sectional area parameter of the wavelength converting portion to a specific range (0.0001-0.01 mm²), which optimizes the balance between conversion efficiency and optical damage resistance. This parameter optimization allows the device to achieve high conversion efficiency while maintaining reliability at high output powers by controlling the power density distribution.
Solution Approach 2:
The patent transitions from a conventional waveguide structure to a bulk-shaped substrate with a specifically sized wavelength converting portion. This dimensional change allows the device to operate in a regime where both high conversion efficiency and high damage threshold are achieved simultaneously, overcoming the limitations of traditional waveguide approaches.
2Reliability
If the cross sectional area of the wavelength converting portion is increased to reduce power density, then optical damage is reduced, but conversion efficiency decreases due to lack of waveguide confinement
Solution Approach 1:
The patent identifies and optimizes the cross-sectional area parameter to a specific range (0.0001-0.01 mm²) that simultaneously provides sufficient area to reduce power density and maintain conversion efficiency. This precise parameter control resolves the trade-off between damage resistance and efficiency by finding the optimal operating point.
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 device achieves stable oscillation of high output power harmonic waves with enhanced conversion efficiency compared to traditional waveguide-type devices, preventing optical damage and increasing output power beyond previous limitations.
Implementation Method 1
Non-linear optical crystals, such as lithium niobate or lithium tantalite, have a high second-order non-linear optical constant. It is thus possible to realize a quasi-phase matched (QPM) type second harmonic generation (SHG) device
Implementation Method 2
wavelength converting portion provided in said substrate and having a cross sectional area of 0.0001 mm2 or larger and 0.01 mm2 or smaller
Data Source
AI summary
A wavelength converting device has a substrate made of an electro-optic material and converts a wavelength of a fundamental light to oscillate a converted light. A wavelength converting portion is provided in the substrate and has a cross sectional area of 0.0001 mm2 or larger and 0.01 mm2 or smaller. A pair of thinner portions are provided in both sides of the wavelength converting portion, respectively, and thinner than the wavelength converting portion.