Controllable Laser Amplifier with Offset Pump Beams
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Solution Overview
Problem
Current methods for producing non-Gaussian laser beams, such as intra-cavity Spatial Light Modulators and manipulating gain profiles in laser crystals, face limitations in scaling up output power, response time, and spatial shape intensity due to low damage thresholds and long response times, making them unsuitable for high-speed and high-power applications.
Innovation Solution
A controllable laser amplifier apparatus comprising a gain medium, a seed laser emitter, and adjustable pump laser emitters that create a gain profile by laterally offsetting or non-coaxially arranging pump laser beams relative to the seed laser beam, allowing for real-time adjustment of the output laser beam's intensity and shape through electronic control of pump laser intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If intra-cavity Spatial Light Modulator is used for beam shaping, then controllable beam shaping is achieved, but output power scaling is limited due to low damage thresholds
Solution Approach 1:
The patent extracts the beam shaping function from the intra-cavity SLM approach and relocates it to an extra-cavity configuration using a Sagnac interferometer. This separates the high-power laser generation (inside cavity) from the beam shaping operation (outside cavity), allowing the SLM to operate at lower intensities while the laser amplifies to high powers independently.
Solution Approach 2:
The patent introduces a Sagnac interferometer as an intermediary device between the laser cavity and the SLM. This interferometer couples the laser beam into the SLM at reduced intensity, performs the beam shaping operation, and then returns the shaped beam to the cavity for amplification, protecting the SLM from high-power damage.
2Adaptability or versatility
If intra-cavity Spatial Light Modulator is used for beam shaping, then beam shaping capability is achieved, but response time is relatively long limiting high speed applications
Solution Approach 1:
The patent employs a SLM with dynamic reconfigurable capabilities within the extra-cavity Sagnac interferometer setup. This allows real-time modification of the beam shaping pattern by changing the SLM phase modulation, enabling fast switching between different beam profiles without the mechanical limitations of intra-cavity approaches.
3Power
If conventional laser amplifier is used, then high power output is achieved, but beam shaping capability is not available
Solution Approach 1:
The patent creates a universal laser amplifier system that simultaneously provides high-power amplification and programmable beam shaping capabilities. The Sagnac interferometer with SLM acts as a multi-functional component that can perform both amplitude modulation for power control and phase modulation for arbitrary beam shaping, making the system adaptable to various applications.
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 apparatus enables high-power, fast, and flexible beam shaping capable of handling both coherent and incoherent laser beams, overcoming limitations of existing technologies by providing high-frequency and high-power handling capabilities with adjustable gain profiles.
Implementation Method 1
at least two pump laser emitters configured to generate respective pump laser beams... wherein the pump laser beams are configured to effect a gain profile in the gain medium... and wherein an output laser beam from the gain medium is a function of at least the gain profile and the seed laser beam
Data Source
AI summary
A controllable laser amplifier apparatus includes a gain medium and a seed laser emitter configured to generate a seed laser beam, the seed laser emitter directed toward the gain medium. The apparatus has at least two pump laser emitters configured to generate respective pump laser beams, wherein the pump laser emitters are adjustable such that respective intensities of the pump laser beams are adjustable relative to one another and/or relative to the seed laser pump, wherein the pump laser emitters are arranged such that at least one of the pump laser beams is laterally offset relative to the seed laser beam, and wherein the pump laser beams are configured to effect a gain profile in the gain medium. An output laser beam from the gain medium is a function of at least the gain profile and the seed laser beam.