Sample interview questions: What are some common techniques for achieving ultrashort laser pulses in the ultraviolet range?
Sample answer:
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Harmonic generation: This technique uses nonlinear optical processes to generate higher harmonics of a fundamental laser frequency, extending the range of wavelengths into the ultraviolet.
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Optical parametric amplification (OPA): This technique employs nonlinear crystals to amplify a portion of the laser spectrum, shifting it to shorter wavelengths and producing ultrashort pulses.
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Chirped pulse amplification (CPA): CPA involves stretching the laser pulse in time, amplifying it, and then recompressing it to achieve higher peak powers and shorter durations.
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Fiber-based techniques: Fiber lasers and fiber-optic parametric amplifiers have demonstrated the ability to generate ultrashort pulses in the ultraviolet range with high repetition rates and compact footprints.
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Supercontinuum generation: This technique involves passing a high-power laser pulse through a nonlinear medium, resulting in the generation of a broad spectrum covering the ultraviolet range. Read full answer