Category Archives: Physics

Electro-optical shutters technique in q switching

In my earlier articles I have discussed the basics of Q-switching and three of its techniques known as mechanical shutters, rotating reflector method and passive shutters. Toady I will discuss the one more following techniques of Q-switching: Electro-optical Shutters. To … Continue reading

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Q-switching: The rotating reflector and passive shutters techniques

Last time I have discussed the basics of Q-switching and one of its techniques known as mechanical shutters. Toady I will discuss two more following techniques of Q-switching: The rotating reflector method. In this method of Q- switching, one of … Continue reading

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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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