5 Essential Elements For LGS Switch Crystal
5 Essential Elements For LGS Switch Crystal
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and shown. It can be proved that a LGS crystal with reasonably high problems threshold can be utilized since the electro-
Studying the interaction of ultrashort pulse lasers with biological tissues and also the corresponding mathematical modeling of possible thermal problems is of basic importance to your knowledge of laser-tissue conversation for advancing surgical application of lasers. The target of this paper would be to critique the present procedures for thermal Investigation of laser-tissue interaction, concentrating on temperature rise and plasma-mediated ablation.
Utilizing the “odd transit time�?method as well as a Nd:LuVO4 crystal possessing a considerable emission cross-portion and a short fluorescence life time as being the attain medium, a LGS electro-optic Q-switched laser was built using a repetition amount of two hundred kHz, average output electrical power of 4.39 W and pulse width of 5.1 ns. These effects suggest that LGS can be employed as a higher repetition fee Q-switch and freed from piezoelectric ringing outcomes no less than in a repetition level of two hundred kHz Which it can offer a realistic Q-switched laser which has a tunable high repetition rate For a lot of applications, like supplies processing, laser ranging, remote sensing, etc.
From eq. (5), we see that optical activity for propagation together the Z-axis includes only the polarization rotation direction with angle θ concerning still left and proper handed direction, dependant on Euler’s rotation theorem33. This consequence corresponds into a polarization rotation defined within an optically active process34 or maybe the rotation of frames alongside the Z-axis with a rotation of θ from the appropriate on the left-handed course.
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This rotation will be eliminated when The sunshine propagates along the -Z path by Benefiting from the reversibility of optical activity35.
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As opposed with earlier described lasers with LGS as Q-switcher21, this present laser has some strengths in the repetition charges and pulse width which need to be attributed towards the shorter cavity size (185 mm) and lessen applied electric voltage (3400 V). The shorter cavity established the shorter roundtrip time and shorter pulse width and was produced based on the “odd transit time�?design and style which was proposed because of the theoretical analysis around the optical active and electro-optic results. The limitation of substantial repetition premiums of the electro-optic Q-switched laser is the piezoelectric effect which would produce the “piezoelectric ring�? The LGS crystal has a small piezoelectric coefficient of 6 × 10−12 C/N, which indicates that the “piezoelectric ring�?impact is negligible.
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To spotlight the influence of optical action over the birefringence, the polarization state might be simplified to:
By inserting the polarizer, Q-switch and QWP in the cavity, a Q-switched laser is attained by making use of a driving voltage. A plot from the output ability vs. the absorbed pump electrical power with repetition costs starting from 20 kHz to two hundred kHz is introduced in Fig. one(a). From this determine, it is evident the output ability is depending on get more info the repetition rate and raises both of those being an increases on the absorbed pump energy and repetition rate. With the absorbed pump electricity of 16.5 W, the utmost output power was measured for being 3.
By rotating the quarter wave plate, the electro-optic crystal with optical exercise can produce electro-optic modulation similar to Individuals crystals without having optical exercise, which include KD*P29 and BBO36. As opposed Together with the “even transit time”thirty design, which happens to be called follows: the light propagates in the LGS crystal together the Z path after which together the -Z route in order to remove the impact of optical activity in the laser cavity30, the existing analyzed “odd transit time�?layout needs only the rotation of 1 / 4 wave plate Therefore simplifying the laser cavity configuration.
An electro-optically Q-switched large-Vitality Er:YAG laser with two polarizers is proposed. By utilizing two Al2O3 polarizing plates and also a LiNbO3 crystal with Brewster angle, the polarization effectiveness is considerably enhanced. As a result, 226 mJ pulse Electricity with sixty two ns pulse width is obtained on the repetition amount of 3 Hz, the corresponding peak electrical power is three.
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