Integrated Optical Resonator for Stable Frequency Conversion
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Solution Overview
Problem
Existing optical frequency conversion devices with discrete elements are sensitive to external disturbances, leading to reduced nonlinear conversion efficiency due to phase matching issues and contamination, which affects the stability and cleanliness of optical resonant cavities.
Innovation Solution
An integral optical resonant cavity design incorporating a housing with a cavity-length adjustment device and temperature control system, featuring plano-concave mirrors and a nonlinear crystal, ensures stable phase matching, impedance matching, and mode matching, while maintaining the cleanliness of optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If discrete optical elements (mirrors and nonlinear crystal) are arranged separately to form the resonant cavity, then the device structure is simple and easy to manufacture, but the device becomes sensitive to external disturbances (mechanical vibration, air flow, temperature variation) which changes relative phases between light fields and reduces nonlinear conversion efficiency
Solution Approach 1:
The patent merges the mirrors and nonlinear crystal into a single integrated optical resonant cavity structure. The mirrors are coated directly on the end faces of the nonlinear crystal, creating an inseparable unit that eliminates sensitivity to external disturbances while maintaining manufacturing simplicity through one-step fabrication processes.
Solution Approach 2:
The patent uses composite material structures where the nonlinear crystal serves dual purposes as both the frequency conversion medium and the substrate for mirror coatings. This integration creates a unified optical path that is immune to misalignment and phase matching issues caused by external vibrations and temperature variations.
2Device complexity
If discrete optical elements are used in the resonant cavity, then the device complexity is low, but the optical elements cannot be effectively kept clean as both mirrors and nonlinear crystal are exposed to external dusts increasing cavity loss
Solution Approach 1:
By combining the mirrors and nonlinear crystal into a single integrated structure, the patent reduces the number of exposed optical surfaces. The integrated design minimizes the interface between optical elements and the external environment, thereby reducing dust contamination and maintaining optical cleanliness without increasing device complexity.
3Reliability
If discrete mirrors and nonlinear crystal are arranged separately, then the phase matching condition is difficult to achieve under external disturbances, but integrating them into one structure increases manufacturing precision requirements
Solution Approach 1:
The patent performs preliminary phase matching during the mirror coating process on the nonlinear crystal. By pre-establishing the correct optical path and phase relationship during manufacturing, the integrated structure maintains stable phase matching under external disturbances without requiring ultra-precise post-assembly adjustments.
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 integral design stabilizes the optical resonant cavity length and temperature, achieving high nonlinear conversion efficiency, simplicity, and suitability for batch production with improved stability and cleanliness of optical components.
Implementation Method 1
The optical frequency conversion process is important and indispensable in the fields of classical optics, quantum optics and the like. The high nonlinear efficiency in the optical frequency conversion process is considered as one of the desirable important indicators.
Implementation Method 2
A standing-wave cavity with two optical cavity couplers includes an input concave mirror and an output concave mirror, the centers of both concave mirrors are on a same straight line, and the nonlinear crystal is provided on the same straight line in the cavity, so as to form the resonant cavity for the optical frequency conversion.
Data Source
AI summary
An integral optical resonant cavity for frequency conversion is provided. The integral optical resonant cavity includes: a housing, a cavity-length adjustment device, a temperature control device and a nonlinear crystal provided in the temperature control device; a first plano-concave mirror and a second plano-concave mirror included in the cavity-length adjustment device and a nonlinear crystal form the optical resonant cavity; and light passes through the first plano-concave mirror, the nonlinear crystal and the second plano-concave mirror sequentially. The stability of the length of the optical resonant cavity is improved through an integral design thereof, and the stability of the temperature of the nonlinear crystal in the integral optical resonant cavity is improved through the temperature control device, thereby stably controlling relative phases between light fields for the frequency conversion in the resonant cavity. Meanwhile, the length of the integral optical resonant cavity is accurately controlled through the cavity-length adjustment device.