Diode-Pumped Laser System for Multi-Photon Applications
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Solution Overview
Problem
Current Ti:sapphire laser systems for biological research are large, expensive, and complex, making them unsuitable for applications requiring high peak power, high repetition rates, and specific wavelength outputs, while also being costly and inefficient due to the need for complex multi-stage pump systems.
Innovation Solution
A diode-pumped high peak power laser system that directly pumps optical crystals within the laser cavity, using vertically stacked optical signals to produce a pump beam with wavelengths between 400 nm to 1100 nm, eliminating the need for intermediate pump lasers and reducing system complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a complex multi-stage pump system is used to achieve high peak power, then the laser intensity is sufficient for nonlinear light-matter interactions, but the device complexity and cost increase significantly
Solution Approach 1:
The patent extracts and eliminates the intermediate pump laser from the traditional multi-stage system. By directly pumping the Ti:sapphire crystal with diode laser arrays, the system removes the unnecessary intermediate stage while maintaining high peak power output, thereby reducing complexity and cost
Solution Approach 2:
The patent introduces diode laser arrays as a direct intermediary to pump the Ti:sapphire crystal, replacing the traditional pump laser intermediary. This new intermediary enables direct pumping while maintaining the required pump intensity, simplifying the overall system architecture
2Power
If the pulse duration is shortened to increase peak power, then the peak power exceeds 100 kW, but the pulse energy management becomes more challenging with limited pump power
Solution Approach 1:
The patent employs periodic pulsed operation with precisely controlled pulse durations in the femtosecond range. By using mode-locking to generate periodic ultrashort pulses, the system achieves high peak power while managing pulse energy efficiently through the periodic nature of the pulses and the corresponding pump power requirements
3Reliability
If Ti:sapphire oscillators are used to achieve high performance, then the laser delivers excellent beam quality and wavelength range, but the system size and cost increase
Solution Approach 1:
The patent merges the pump laser and Ti:sapphire oscillator into a single integrated system. By directly pumping the Ti:sapphire crystal with diode arrays, the system combines the pumping mechanism and laser medium into one compact unit, reducing overall system size while maintaining high performance
Solution Approach 2:
The diode laser arrays serve multiple functions: they provide the pump energy, define the pulse characteristics through mode-locking, and enable direct pumping of the Ti:sapphire crystal. This multi-functionality reduces the number of separate components needed, thereby reducing system size
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 diode-pumped laser system achieves output powers of 25 kW or more with pulse durations in the 50 fs-100 fs range, suitable for biological research applications like multi-photon microscopy, while being more compact and cost-effective than traditional Ti:sapphire systems.
Implementation Method 1
A diode-pumped high peak power laser system is provided which includes at least one diode pump system configured to output at least one pump beam. The pump beam may be comprised of two or more vertically stacked optical signals having a wavelength from about 400 nm to about 1100 nm.
Implementation Method 2
The pump beam is directed into a laser cavity having one or more optical crystals therein. The optical crystals are configured to output at least one optical output having a wavelength of about 750 nm to about 1100 nm and having an output power of about 25 kW or more.
Data Source
AI summary
The present application discloses various embodiments of a high peak power laser system which includes a diode pump source configured to directly pump at least one optical crystal positioned within the laser cavity, the diode pump source emitting at least one pump beam comprised of two or more vertically stacked optical signals having a wavelength from about 400 nm to about 1100 nm., the optical crystal configured to output at least one optical output having a wavelength of about 750 nm to about 1100 nm and having an output power of about 25 kW or more.