Diode-Pumped Laser Pulse Modulation for Frequency Tuning
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Solution Overview
Problem
Current techniques for pumping pulsed solid-state lasers are inefficient and cumbersome, leading to reduced laser power output and limited operating frequency range, especially for medical/surgical applications, due to the temperature-wavelength relationship of diode lasers and the need for complex cooling mechanisms.
Innovation Solution
A method and laser system that modulates the light emission pulses of diode lasers to operate only at frequencies close to the requested setting, with pulse amplitudes and durations sufficient to trigger emission, while others are below the lasing threshold, allowing for efficient and stable pumping and rapid changes between frequency settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If diode lasers are operated to efficiently pump solid-state lasers with narrow absorption bands, then pumping efficiency is improved, but the operating temperature range is limited
Solution Approach 1:
The patent applies dynamics by continuously adjusting the diode laser operating temperature in real-time to track the required wavelength, rather than operating within a fixed temperature range. The control system dynamically modifies temperature based on feedback from wavelength measurements, enabling the system to adapt to different pumping requirements while maintaining high efficiency.
Solution Approach 2:
The patent changes the operating temperature parameter of the diode laser dynamically to match the required wavelength for efficient pumping. By continuously adjusting this parameter based on feedback control, the system maintains optimal pumping efficiency across varying operating conditions and frequency settings.
2Stability of the object's composition
If complex cooling mechanisms are used to control diode laser temperature, then wavelength stability is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback control by measuring the actual wavelength of the diode laser and using this information to adjust the operating temperature. This closed-loop feedback system automatically compensates for temperature drift and wavelength variations, maintaining wavelength stability without requiring complex mechanical cooling mechanisms.
Solution Approach 2:
The system performs self-regulation of its operating temperature through feedback control, automatically adjusting its own parameters to maintain optimal performance. This self-service approach eliminates the need for external complex cooling systems while maintaining wavelength stability.
3Adaptability or versatility
If laser diodes operate in pulsed mode with broad frequency range, then versatility is improved, but laser power output efficiency decreases
Solution Approach 1:
The patent dynamically adjusts the diode laser operating temperature to match the required wavelength for each desired frequency setting of the solid-state laser. This dynamic adaptation enables the system to operate efficiently across a broad frequency range while maintaining high laser power output efficiency by ensuring optimal wavelength matching at all times.
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
This approach significantly increases laser power output by up to 30% and stabilizes operating conditions, enabling faster temperature stabilization and simplified cooling, allowing for quasi-instantaneous changes between frequency settings and a more compact, efficient diode-pumped solid-state laser system.
Implementation Method 1
the emitted wavelength/emitted spectrum peak wavelength can change or shift, for example, by 0.28 nm/°C
Implementation Method 2
solid state lasers having spectral absorption bands with narrow widths
Data Source
AI summary
The present invention relates to a method for operating a pulsed diode-pumped solid-state laser comprising: providing a pump light source for pumping a solid-state laser, said pump light source comprising at least one laser diode unit configured for emitting a series of light pulses for pumping the solid-state laser, modulating the series of light emission pulses of the at least one laser diode unit such that only the light pulses with a frequency close to or equal to a requested frequency setting of the solid-state laser are operated with a/the required pulse amplitude and/or a/the required pulse duration to trigger light emission of the solid-state laser, and such that any other light pulses of the at least one laser diode unit are operated to not trigger light emission of the solid-state laser.