V-Shaped Optical Frequency Mixer With Periodically Poled Crystal
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Solution Overview
Problem
Existing optical frequency mixing technologies face limitations in efficiently generating wavelength-shifted outputs through nonlinear frequency mixing processes, particularly in achieving high efficiency and flexibility in wavelength conversion using nonlinear crystals.
Innovation Solution
An optical frequency mixer employing a V-shaped resonant cavity with a nonlinear crystal having periodically poled domains of alternating polarity, where the nonlinear crystal is positioned between an output coupler and an input interface, allowing for interaction between a resonating wave and a mixing wave to generate an output wave through sum frequency generation, difference frequency generation, or second harmonic generation processes, with phase matching achieved by the periodically poled domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a nonlinear crystal is used for frequency mixing, then wavelength conversion is achieved, but conversion efficiency is limited
Solution Approach 1:
The patent combines multiple functions into a single resonant cavity system: frequency mixing, wavelength selection, and output coupling are integrated through the nonlinear crystal positioned within the cavity. This merging allows the system to achieve high conversion efficiency by maintaining resonant conditions for both input and output wavelengths simultaneously, resolving the contradiction between output power and conversion efficiency.
Solution Approach 2:
The patent employs periodically poled domains with varying poling periods to change the phase-matching parameters of the nonlinear crystal. By adjusting the poling period across different regions of the crystal, the system can efficiently convert multiple wavelengths while maintaining high conversion efficiency, thus resolving the contradiction between achieving high output power and maintaining energy conversion efficiency.
2Measurement precision
If fixed wavelength conversion is implemented, then specific wavelength output is achieved, but operational flexibility is reduced
Solution Approach 1:
The nonlinear crystal is divided into multiple periodically poled domains with different poling periods along its length. Each domain is engineered to provide phase-matching for specific wavelength combinations, allowing the system to precisely convert to specific wavelengths while maintaining the ability to switch between different wavelength outputs by selecting different domains, thus resolving the contradiction between wavelength precision and operational flexibility.
Solution Approach 2:
The system enables dynamic wavelength selection through the resonant cavity configuration, where the output wavelength can be adjusted by changing which resonant mode is excited or by selecting different input wavelength combinations. This dynamic capability allows precise wavelength conversion while maintaining operational flexibility to adapt to different wavelength requirements.
3Adaptability or versatility
If broadband operation is achieved, then wavelength range is expanded, but temperature stability becomes difficult to maintain
Solution Approach 1:
The patent uses periodically poled domains with specifically engineered poling periods that are designed to compensate for temperature-dependent phase-matching conditions. By varying the poling period across different domains, the system achieves broadband wavelength conversion while each domain maintains stable operation at the designed temperature, resolving the contradiction between expanded wavelength range and temperature stability.
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 solution enables highly efficient generation of new wavelengths with flexible operation, achieving high output power and broadband operation ranges in temperature and wavelength, while maintaining ultra-fast response times and high frequency repetition rates without oscillation delay.
Implementation Method 1
to generate a wavelength shifting through a nonlinear frequency mixing process
Implementation Method 2
through sum frequency generation, difference frequency generation, or second harmonic generation processes
Implementation Method 3
through sum frequency generation, difference frequency generation, or second harmonic generation processes
Implementation Method 4
with phase matching achieved by the periodically poled domains
Implementation Method 5
to generate a resonating wave in the resonant cavity
Data Source
AI summary
An optical frequency mixer according to one embodiment of the present invention comprises a V-shaped resonant cavity including a first reflective surface, a second reflective surface and an output coupler, a pumping unit configured to emit a pumping wave to the laser gain medium to generate a resonating wave in the resonant cavity, a nonlinear crystal positioned on an optical path of the resonating wave in the resonant cavity, and an input interface configured to emit a mixing wave into the resonant cavity. Preferably, the output coupler can be a plano-concave lens having a concave surface configured to reflect the resonating wave and to focus the resonating wave such that the spot size of the resonating wave is matched the spot size of the pumping wave. Particularly, the nonlinear crystal is positioned between the output coupler and the input interface.