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What are the Q switching technologies

by Darshan Fame
What are the Q switching technologies

Q switching innovation

The Q-switching strategy is an efficient method to acquire brief pulses of high power. Q value is an index to assess the quality of an optical resonator in a laser (a “quality variable”). Q-switching innovation, likewise called Q-switching modern technology, is a technology that compresses the continuous laser result into a really slim pulse, thereby raising the peak power of the light source by several orders of magnitude.

The laser resonator laser at this time due to the limit is expensive, do not generate laser shock, making the top level population a great deal of accumulation, when gathered to saturation worth, the loss of the cavity quickly reduced to an extremely small worth, As a result, a large portion of the energy stored in the upper-level particles is converted into laser power in a short period of time, resulting in the generation of a solid laser pulse.

Q switching technology is primarily split right into energetic Q switching modern technology (acousto-optic Q switching and also electro-optic Q switching) as well as passive Q switching technology.

The passive

In passive Q-switching technology, a saturable absorber (normally a strong saturable absorber, such as Gr: YAG) is set in the resonator of a laser, and its saturation absorption result is made use of to periodically manage the loss of the resonator to get the pulsed light output. At the beginning, the autofluorescence in the cavity is extremely weak, the absorption coefficient of the saturable absorber is very large, the light transmittance is extremely reduced, and the cavity remains in a state of high loss, so the laser oscillation cannot be formed.

Remain to function with light pump, the inversion of particle number to gather, lumen fluorescence strength unceasingly, when the light intensity reaches a certain value, the saturable absorber absorption saturation worth was unexpectedly “blanch” and the outcome laser pulse, and then light field inside the cavity is abate, saturable absorber restore absorption qualities, and afterwards repeat the procedure to obtain the pulse light outcome.

Generally used passive Q-switched crystals are: Co:Spinel crystal, Cr: YAG, Cr: GSGG, V: YAG, Cr: YSO, and so on

Active Q switching technology

Acousto-optic Q switch

The acousto-optic Q-switching innovation describes the acousto-optic tool in the resonator. When there is no ultrasonic wave, the light beam can openly pass through the acousto-optic medium. The Q-value of the cavity is really high (reduced loss), which makes it simple to create laser oscillation.

When there is an ultrasonic wave, the density of acoustic and optical tools changes periodically, resulting in the routine modification of the refractive index as well as the deflection of the beam of light. At this time, the Q value of the resonator is really low (high loss), and the variety of particles in the upper level also accumulates rapidly. Consequently, we can manage the loss in dental caries by regulating the ultrasonic wave and then getting the pulse light outcome.

Common acousto-optic Q crystals are TeO2 and more.

Electro-optic Q switching

Electro-optic Q switching is to utilize the electro-optic impact of the crystal to include a step voltage on the crystal to adjust the representation loss of photons in the cavity. A high voltage is related to the crystal; currently, the electro-optic Q button is in the off state, the resonator remains in the low Q state, and the system remains in the energy storage space state. When the number of inverted fragments in the resonator gets to the optimum, the high pressure on the crystal is suddenly eliminated, and the resonator remains in a high Q state, developing a pulsed laser output.

Commonly used electro-optic Q crystals are BBO, LiNbO3, LiTaO3 (LT), KTP, and so on.

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