Semiconductor Disk Optical Amplifier for Sub-1um Wavelengths
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Solution Overview
Problem
Existing optical amplifiers, such as Doped Fibre Amplifiers, solid state crystal amplifiers, and semiconductor optical amplifiers, are expensive, have large footprints, and struggle with pulse distortion and low beam quality, especially when amplifying wavelengths below 1 μm and achieving long-term stability.
Innovation Solution
An optical amplifier utilizing a semiconductor disk gain medium with a quantum well layer, optically pumped by a diode laser, and incorporating steering optics to enhance amplification, allowing for efficient gain extraction and pulse compression, enabling amplification across a broad range of wavelengths including those below 1 μm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Doped Fibre Amplifiers are used, then amplification can be achieved, but the system becomes expensive and cannot amplify wavelengths less than 1 μm
Solution Approach 1:
The patent changes the fundamental parameter of the gain medium from doped fibre to semiconductor disk, enabling amplification at wavelengths less than 1 μm while maintaining cost-effectiveness through semiconductor manufacturing processes
2Adaptability or versatility
If solid state crystal amplifiers are used, then amplification of wavelengths less than 1 μm is achieved, but the footprint and manufacturing cost increase
Solution Approach 1:
The patent transitions from bulk solid state crystal amplification to a disk-shaped semiconductor gain medium with vertical geometry, reducing the horizontal footprint while maintaining amplification capability at wavelengths less than 1 μm
Solution Approach 2:
The patent changes the gain medium from solid state crystal to semiconductor disk, achieving compact form factor compatible with integrated photonic circuits while maintaining wavelength versatility
3Area of stationary object
If semiconductor optical amplifiers are used, then compact size is achieved, but pulse distortion and low beam quality occur
Solution Approach 1:
The patent implements distributed Bragg reflectors with specific reflectivity profiles at different locations within the semiconductor disk structure, creating localized optical feedback that maintains beam quality while preserving compact size
Solution Approach 2:
The patent uses composite semiconductor structures combining multiple layers with different properties (gain medium, DBR layers, contact layers) to achieve both compact form factor and high beam quality through optimized material composition
4Power
If regenerative amplifiers are used, then amplification is achieved, but the device becomes complex and requires high-speed optical switches
Solution Approach 1:
The patent extracts the optical switching function from the amplification system by using a continuous semiconductor disk gain medium with optical feedback, eliminating the need for high-speed optical switches while maintaining amplification capability
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 compact, cost-effective optical amplifier with improved stability and beam quality, capable of amplifying a wide range of wavelengths, including those below 1 μm, by efficiently extracting gain and compressing pulses.
Implementation Method 1
the optical field is then amplified through interaction with the doping ions
Implementation Method 2
a pump field source for generating an optical pump field for the semiconductor disk gain medium
Data Source
AI summary
An optical amplifier is described. The optical amplifier (1) comprises a semiconductor disk gain medium (2) including at least one quantum well layer (9) and a pump field source (17) for generating an optical pump field (3) for the semiconductor disk gain medium. The optical amplifier acts to generate an output optical field (5) from an input optical field (4) received by the optical amplifier and arranged to be incident upon the semiconductor disk gain medium. Employing a semiconductor disk gain medium within the optical amplifier allows it to be optically pumped and thus provided for increased stability and beam quality of the output optical field while allowing for the design of optical amplifiers which can operate across a broad range of wavelengths. The optical amplifier may be employed with continuous wave or pulsed input optical fields.