Injection Locking for Gain Switched Diode Jitter Stabilization
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Solution Overview
Problem
High power laser systems for materials processing require amplitude-stable pulse generation, which is not adequately addressed by existing telecommunications lasers due to different power and pulse jitter requirements.
Innovation Solution
The system includes a primary and secondary laser system with an optical system to attenuate and delay primary laser pulses, a control system to set wavelengths, and a temperature control system to stabilize the pulses, using injection locking to generate amplitude-stable secondary laser pulses, and an optical amplifier to produce amplified pulses with a controlled spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If gain switched laser diodes are used for high power materials processing, then pulse power is sufficient, but pulse jitter and amplitude stability are poor
Solution Approach 1:
An injection laser is used to pre-condition the gain medium before the main pump pulse arrives. This preliminary action prepares the laser medium with a controlled initial state, ensuring that when the high-power pump pulse occurs, the gain switched laser diode produces pulses with reduced jitter and improved amplitude stability while maintaining the required high power output
2Reliability
If telecommunications laser systems are used, then pulse jitter is low, but pulse power is insufficient for materials processing
Solution Approach 1:
The system merges a low-power injection laser with excellent pulse timing characteristics with a high-power gain switched laser diode. The injection laser provides the timing reference and spectral control, while the gain switched laser diode amplifies the signal to materials processing power levels, combining the advantages of both systems
3Manufacturing precision
If spectral control is implemented in gain switched lasers, then pulse quality improves, but system complexity increases
Solution Approach 1:
The injection laser acts as an intermediary that provides spectral control to the gain switched laser diode. By using the injection laser's well-defined spectrum to seed the gain medium, spectral control is achieved without requiring complex spectral filtering or tuning mechanisms in the high-power laser path, thus maintaining relative system simplicity
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 achieves stable pulse energies and reduced pulse jitter, improving the quality of materials processing by ensuring consistent pulse amplitudes and spectral control, enhancing processing accuracy and efficiency.
Implementation Method 1
an injection locking laser diode optically coupled to the gain switched laser diode so as to spectrally control the seed laser pulses
Implementation Method 2
an optical amplifier is configured to receive the secondary laser pulses and produce amplified pulses having an output spectrum based on a spectrum of the secondary laser pulses
Implementation Method 3
the control system includes at least one temperature control system that is coupled to at least one of the primary laser or the secondary laser and configured to set the wavelength associated with the primary laser pulses to correspond to the wavelength associated with the secondary laser based on a temperature of at least one of the primary laser or the secondary laser
Data Source
AI summary
Pulse power can be stabilized by applying spectrally narrow pulses to a laser diode during gain switching. An injection locking laser with a narrow emission bandwidth is tuned to a gain bandwidth of a laser diode to be gain switched. The injection locking emission is pulsed to provide locking pulses that are attenuated and then coupled to a laser diode. A gain switching pulse drive is applied to the laser diode in the presence of the attenuated locking pulses. The gain switched output is then stabilized with respect to pulse energy and pulse amplitude, and is suitable as a seed pulse for lasers to be used in materials processing.