About KTP Crystal
About KTP Crystal
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Comparison of picked Houses of EO crystals, LN, and KTP, respectively. KTP was most popular for EO devices for high-electric power and large-repetition charge laser as a consequence of its lessen absorption, exceptional thermal properties, and similar EO Houses. The thermal result of EO devices is very first mainly because KTP can be a quasi-1D superionic conductor, Hence the electrical conductivity is beneficial based on temperature, resulting in electron-induced injury and discoloration at superior temperatures. Second, accompanying the rise in laser electrical power, amongst the key problems was the thermal defection of the again-propagating beam because of thermally induced refractive index gradients (thermal lensing impact). On top of that, Even though the birefringence adjust a result of the temperature modify is usually compensated through the double-crystal framework, the KTP with a large thermo-optic coefficient, as well as the oscillating laser and pumping light-weight Power absorbed via the entrance could be compensated and also the back again two crystals are various, so while in the high pumping.
Hence, the focal length of lens is tunable by thoroughly managed the optical phase as aspheric or Fresnel lens phase profile. e EO laser beam scanner refract light by making use of a section hold off by changing the refractive index with the medium, and by modifying the voltage applied to the crystal to alter the steering angle to EO Handle the phase delay over the beam cross-part. file Polarization modulator can Consequently be observed as being a voltage-controlled waveplate, and it can be utilized for modulating the polarization point out
KTP crystal (Potassium Titanyl Phosphate) is an excellent and still affordable non-linear crystal delivers A variety of unique attributes:
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) reacts at near 1300 degree Kelvin inside a Unique significant toughness metal cylinder that contains an autoclave which is lined with unreactive gold. The elevated temperature makes stress that may burst a lesser vessel, so The entire assembly is often Found underground in the silo to consist of any doable explosive power.
a Three contributions of Electro-optic (EO) coefficients: acoustic phonons, optic phonons, and Digital. b–f EO read more impact products: b high-speed EO stage modulator, exactly where An electrical subject improvements the section delay of the laser beam despatched throughout the crystal; c EO Q-change are modulators where by the transmission is possibly switched on or off, instead of diverse little by little. d Electrically tunable lenses, evaluating to the standard stable lenses with mounted refractive index, the refractive index of lenses is electrically tunable.
Considering the fact that the wonderful EO Houses of KTP were being realized in 1976 combined with the discovering of nonlinear Qualities, several attempts ended up produced to comprehend its EO purposes, based on which we realized the preparation of huge dimensions, large problems resistance, and lower conductivity crystals even further to fabricate it into EO switches and EO modulators. It is feasible to develop KTP crystals with a total excess weight bigger than ten kg at a single time (one autoclave for each cycle), depending upon the growth of a big internal diameter autoclave. In the optimized hydrothermal crystal advancement method, the electro-chromic, photo-chromic, and catastrophic laser-induced damages were being conquer, and crystals with uniform high optical, electrical, and piezoelectric Qualities had been received, earning the professional application of HKTP EO crystals a truth.
In the event the KTP crystal is utilised being an EO modulator, the applied electrical area is parallel on the z-axis, and The sunshine propagation way is parallel into the y-axis or x-axis. If a relatively lessen convert-off voltage is desired, a y-axis change is required. In observe, lengthy x-axis switches in many cases are utilised to obtain the specified lower switch-off voltage for crystal progress economics. The E-O coefficient with the H-KTP crystal is often determined as stick to in Table 3. Our EO coefficient measurement outcomes at 632.eight nm are in step with the 1986 exam effects using the hydrothermal approach KTP32.
The horizontal axis may be the year, and the vertical axis could be the inner diameter of your autoclave. The size with the crystal is basically determined by the internal diameter from the autoclave, so it truly is outlined alongside one another while in the graph, marked using a solid image to distinguish it through the hollow image symbolizing the inner diameter of your autoclave.
The environmentally friendly laser radiation that KTP creates has many apps. Inexperienced laser mild has fantastic penetration by ocean drinking water, so it truly is employed for conversation and bathymetric measurement of The ocean floor and riverbed attributes.