LGS Switch Crystal Fundamentals Explained
LGS Switch Crystal Fundamentals Explained
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and shown. It really is proved that a LGS crystal with rather significant harm threshold may be used because the electro-
Determined by Q-switching idea, the pulse width and peak electric power are depending on the cavity duration, which implies that in LGS Q-switching based upon the reversibility of optical action would make a larger pulse width, Regardless of the look complications encountered Along with the laser cavity. Despite the fact that LGS Q-switched lasers with a rotated quarter wave plate or polarizer happen to be claimed, there isn't a Investigation on the mechanism supporting the appliance of This method. In this particular perform, we theoretically review the coupling amongst optical activity as well as electro-optic Qualities of LGS during the Q-switching method and see that the one outcome of optical activity is really a rotation along the propagating direction, that may be eliminated merely by rotating the quarter wave plate. Dependant on the theoretical analysis, we created a LGS Q-switched laser in experiments that has a Nd:LuVO4 crystal which has a substantial emission cross-part and a short fluorescence lifetime25,26. This get the job done brings about the Procedure of a laser by using a two hundred kHz repetition level and also a five.one ns pulse width, which stand for the best repetition level and narrowest pulse width in Q-switched LGS crystal lasers.
Using an optically Energetic langasite (LGS) crystal as the electro-optic Q-switch, we exhibit an productive Q-switched laser having a repetition level of two hundred kHz. Determined by the theoretical Evaluation of the interaction involving optical activity and electro-optic assets, the optical action of your crystal has no impact on the birefringence throughout Q-switching In the event the quarter wave plate made use of was rotated to align with the polarization direction. Having a Nd:LuVO4 crystal possessing a large emission cross-segment and a brief fluorescence life time since the obtain medium, a secure LGS Q-switched laser was built with ordinary output electric power of 4.
when the above mild propagates within an optically Lively crystal along the Z-route with length L and refractive index nx and ny together the X- and Y- directions, respectively, the polarization state is usually expressed as:
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This rotation will be removed when The sunshine propagates along the -Z path by Benefiting from the reversibility of optical activity35.
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In contrast with preceding reported lasers with LGS as Q-switcher21, this current laser has some strengths within the repetition costs and pulse width which need to be attributed towards the shorter cavity size (185 mm) and decreased used 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 with the theoretical Assessment on the optical active and electro-optic results. The limitation of large repetition premiums of the electro-optic Q-switched laser is the piezoelectric impact which would create the get more info “piezoelectric ring�? The LGS crystal has a small piezoelectric coefficient of 6 × 10−12 C/N, which signifies that the “piezoelectric ring�?impact is negligible.
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The electro-optic Q-switch made by LGS is in fact a different kind of rotation-electro-optical Q-switch. Due to the influence of optical rotation, it can be employed as a useful switch and a fantastic Q-modulation final result can be obtained. LGS crystal widens the new path of Discovering and getting new electro-optic crystals from optically Lively crystals.
The polarization state of appropriate-handed and still left-handed circularly polarized gentle is often expressed as32:
By rotating the quarter wave plate, the electro-optic crystal with optical action can produce electro-optic modulation comparable to People crystals without having optical action, such as KD*P29 and BBO36. In contrast with the “even transit time”30 structure, that's described as follows: the light propagates inside the LGS crystal together the Z path after which you can alongside the -Z path in an effort to reduce the result of optical exercise within the laser cavity30, the current analyzed “odd transit time�?structure calls for just the rotation of a quarter wave plate Hence simplifying the laser cavity configuration.
An electro-optically Q-switched substantial-Power Er:YAG laser with two polarizers is proposed. By making use of two Al2O3 polarizing plates in addition to a LiNbO3 crystal with Brewster angle, the polarization performance is appreciably enhanced. Subsequently, 226 mJ pulse Electrical power with 62 ns pulse width is realized at the repetition amount of 3 Hz, the corresponding peak energy is three.
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