Category Archives: LASER

Q Switching

Q-switching is a technique used to produce a high output pulse. It is accomplished by using a device to prevent the reflection of photons back and forth  in the active medium. This produces a  higher population inversion in the  metastable … Continue reading

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Ouput and applications of dye laser

I have already discussed the construction and working of dye laser. Let us discuss the output and applications of dye lasers. Output: The dye laser provides 3nsec pulses in the spectral  range of 360 nm to 950 nm. The typical … Continue reading

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Working of dye laser

Last time I have discussed the construction of dye lasers. Let us discuss the working of dye laser: The molecules have singlet as well as triplet states. Each electronic  state comprises of several vibrational states and each vibrational state  comprises … Continue reading

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why dye lasers are also known as tunable lasers

The most useful feature of dye lasers is their tunability.  The tunability means that the lasing wavelength for a dye may be varied over a wide range.  Due  to this   reason, dye lasers are also called tunable lasers. Tuning over … Continue reading

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Dye laser and its construction

Dye lasers use liquid organic dyes. These organic dyes are dissolved in solvents like water, ethyl  alcohol, methanol. The most widely used dye is rhodamine-6G, also known as Xanthene dye. These lasers are discovered by Sorokin and his colleagues. Dye … Continue reading

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Output, use and disdavantages of semiconductor laser

Output of semiconductor laser: The output powers of about 10mW are achieved in continuous wave operation and in pulsed opration the peak power runs to 100W. It has output wavelength from 8200 to 9000 angstroms. So the wavelength of semiconductor … Continue reading

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Working of semiconductor laser

In my earlier articles, I have explained the construction of semiconductor laser. Toady I will discuss the working of semiconductor laser. Achievement of population inversion: When p-n junction diode is forward biased, then there will be injection of electrons into … Continue reading

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Construction of semiconductor laser

In the last article, I have explained the basics of semiconductor. Today I will explain the construction of a semiconductor laser. Example of semiconductor laser: One of the examples of semiconductor lasers is gallium arsenide (GaAs). It is heavily doped … Continue reading

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Semiconductor laser

Before discussing the construction and working of semiconductor laser, let us discuss the review of semiconductors as it will be necessary for you to write the basics of semiconductors in case of exams: A semiconductor is a material whose conductivity … Continue reading

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wavelength, output and applications of carbon dioxide laser

Why helium is doped in carbon dioxide laser: The CO2 molecules in the states E4 and E3 deexcite to state E2 through inelastic collision with unexcited CO2 molecules. This process is very fast so there will be accumulation of CO2 … Continue reading

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