Sample interview questions: What are some common techniques for achieving ultrashort laser pulses in the visible range?
Sample answer:
- Kerr-lens mode-locking (KLM):
- Utilizes the nonlinear optical properties of certain materials to create a self-focusing effect, leading to the formation of ultrashort pulses.
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KLM is commonly employed in solid-state lasers, such as Ti:sapphire lasers.
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Passive mode-locking:
- Involves the use of intracavity elements, such as saturable absorbers or semiconductor saturable absorber mirrors (SESAMs), to achieve pulse shortening.
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Passive mode-locking techniques are widely used in various laser systems due to their simplicity and reliability.
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Active mode-locking:
- Employs external modulators or feedback loops to actively control the laser’s cavity length or gain, resulting in the generation of ultrashort pulses.
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Active mode-locking techniques offer precise control over pulse parameters, making them suitable for applications requiring high stability and tunability.
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Femtosecond fiber lasers:
- Utilize the unique properti… Read full answer