Sample interview questions: What are some common techniques for achieving tunable laser output in the visible range?
Sample answer:
There are several commonly used techniques for achieving tunable laser output in the visible range. These techniques involve manipulating the physical properties of the laser medium, such as the gain medium or the cavity length. Here are a few of the most commonly employed methods:
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Dye lasers: Dye lasers are a popular choice for achieving tunable laser output in the visible range. They utilize organic dye molecules as the gain medium, which can be easily tuned by changing the dye solution or the pump wavelength. By adjusting the concentration of the dye or the cavity length, a wide range of visible wavelengths can be obtained.
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Ti:sapphire lasers: Titanium-doped sapphire lasers are another widely used technique for tunable visible lasers. These lasers utilize a Ti:sapphire crystal as the gain medium, which exhibits a broad emission spectrum in the visible region. By adjusting the pump power or using intracavity tuning elements such as prisms or gratings, the output wavelength can be tuned across a wide range of visible wavelengths.
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Semiconductor lasers: Semiconductor lasers, such as diode lasers, are highly versatile and offer tunable output in the visible range. These lasers utilize a semiconductor material as the gain medium, which can be easily tuned by changing the temperature or injection current. Additionally, external cavity configurations can be employed with semiconductor lasers to achieve a wider range of tu… Read full answer