Contents
Source: TLB
Understanding Divided-Pulse Amplification for Ultrashort Pulses
Introduction
Divided-pulse amplification is a technique used to address the issue of excessive nonlinear phase shifts in amplifiers for ultrashort pulses. These phase shifts can lead to spectral broadening, pulse distortion, or even damage to the amplifier due to the high peak power of the pulses.
Principle of Divided-Pulse Amplification
In divided-pulse amplification, each pulse is split into multiple pulses before amplification and then recombined after amplification. This division is typically achieved by sending the pulse through birefringent crystals at specific angles to create time delays between the pulses. The pulses are then recombined either by reversing their path through the crystals or using a second set of crystals.
Comparison with Chirped-Pulse Amplification
Divided-pulse amplification differs from chirped-pulse amplification, another method for managing nonlinear phase shifts. Chirped-pulse amplification involves stretching, amplifying, and recompressing pulses using dispersion techniques. The two methods have different requirements and suitability depending on the pulse duration.
Conclusion
In conclusion, divided-pulse amplification is effective for longer pulses, while chirped-pulse amplification is more suitable for very short pulses. The choice between the two methods depends on factors such as pulse duration and energy loss considerations.
Additional Information
Divided-pulse amplification has been the subject of various research studies and developments to optimize its performance for different applications. Further research in this area continues to explore new possibilities and improvements in ultrashort pulse generation and amplification.
Source: Laboratory for Laser Energetics – University of Rochester
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