Multiwavelength Laser Source With Fixed Nonlinear Converter
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Solution Overview
Problem
Achieving direct multiwavelength emission from laser sources in the optical spectrum is cumbersome and requires multiple lasers or wavelength converters, with existing methods involving complex beam steering and limited spectral coverage.
Innovation Solution
A multiwavelength laser source with a fixed OPO crystal that uses separate spectral inputs combined in a common pump laser stage, achieving variable spectral output by varying the laser pump spectral output on a pulse-to-pulse basis, and utilizing multiple seed lasers to drive a single nonlinear optical converter for scalable, broad spectral coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lasers or wavelength converters are used to achieve multiwavelength emission, then spectral coverage is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple seed lasers with different wavelengths into a single beam path that pumps one OPO crystal. This merging approach achieves multiwavelength output through a single integrated system rather than separate lasers, reducing device complexity while maintaining broad spectral coverage
Solution Approach 2:
The OPO crystal serves as a universal wavelength converter for multiple seed laser wavelengths. By designing the crystal and phase-matching conditions to handle multiple input wavelengths simultaneously, the system achieves multiwavelength output through a single multi-functional component rather than multiple specialized converters
2Adaptability or versatility
If mechanical or electro-optical tuning of the OPO crystal is used to achieve wavelength tuning, then spectral output flexibility is improved, but device complexity and control difficulty increase
Solution Approach 1:
Instead of tuning the OPO crystal to change output wavelength, the patent inverts the approach by changing the seed laser wavelengths and keeping the OPO crystal fixed. The phase-matching conditions are selected for a specific signal wavelength, and different seed wavelengths produce different idler wavelengths through the fixed crystal, simplifying the tuning mechanism
Solution Approach 2:
The patent extracts the tuning function from the OPO crystal and places it in the seed laser sources. By removing the need for mechanical or electro-optical tuning of the crystal, the system achieves spectral flexibility through the seed lasers while eliminating complex control mechanisms
3Ease of manufacture
If a fixed OPO crystal with phase-matching conditions is used, then manufacturing simplicity is improved, but spectral coverage is limited
Solution Approach 1:
The patent changes the seed laser wavelength parameter to achieve different idler wavelengths from the same fixed OPO crystal. By varying the pump wavelength while maintaining fixed phase-matching conditions, the system achieves broad spectral coverage without requiring multiple crystals or complex tuning mechanisms
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 provides a simple architecture for simultaneous multiband output with broad spectral coverage, reducing the need for multiple converters and high input laser power, while avoiding mechanical and electro-optical adjustments, and enabling temporal flexibility and near-continuum spectral coverage.
Implementation Method 1
a fixed optical parametric oscillator (OPO) to convert and output the amplified first beam as a multiwavelength second beam including the pump wavelengths, a corresponding plurality of signal wavelengths, and a corresponding plurality of idler wavelengths
Implementation Method 2
a plurality of seed lasers to generate a corresponding plurality of seed beams having a corresponding plurality of distinct seed wavelengths
Data Source
AI summary
Techniques are provided for a multiwavelength laser source and a method of driving the multiwavelength laser source. The multiwavelength laser source includes: a plurality of seed lasers to generate a corresponding plurality of seed beams having a corresponding plurality of distinct seed wavelengths; a laser combiner to receive and combine the seed beams into a single first beam; an optical amplifier to amplify the first beam; and a single fixed nonlinear converter to convert and output the amplified first beam as a multiwavelength second beam including the seed wavelengths and one or more new wavelengths distinct from and generated from the seed wavelengths. In some embodiments, the nonlinear converter is an optical parametric oscillator (OPO) or an optical parametric generator (OPG). In some other embodiments, the nonlinear converter is a sum frequency generator (SFG), a difference frequency generator (DFG), or an optical parametric amplifier (OPA).