Pockels Cells Crystal

 

532nm Nd YAG Laser For Optical Communication - Laser Crylink

Introduction of 532nm Nd YAG Laser For Optical Communication

532nm laser being used for underwater optical communication  

Because the low loss window in seawater is 0.46nm~0.54nm, and the pulse peak energy should be greater than 200mJ, the pulse width is generally 10ns~20ns, the repetition frequency is about 50Hz, and the divergence angle is generally less than 0.1mrad, the laser spot is as uniform as possible, and the 532nm Nd:YAGlaser with electro-optic Q-switching can be used for these aspects.

Theory of crylink’s 532nm Nd YAG Laser

Laser Crystal - Nd:YAG

It is used to create a laser with a wavelength of 1064 nm in order to provide fundamental light for a laser with a wavelength of 532 nm. The gain medium Nd:YAG is a cubic crystal that is optically isotropic and has a 1.0 percent Nd3+ ion doping concentration.

EO Q-Switch - LiNbO₃

To achieve high peak power, Q-switching technology must concentrate the energy into a single pulse. The electro-optic coefficient, acousto-optic coefficient, and nonlinear performance of LiNbO3 are all high. It's commonly utilized in photoregulators, waveguide material substrates, and Nd laser Q-switches. Water insoluble, difficult to deliquesce, does not require sealed storage, minimal transmission loss, chemical and mechanical qualities that are stable

Frequency Doubling - LBO

A LBO crystal is used to double the frequency. A negative biaxial crystal, the LBO crystal is a negative biaxial crystal. The destruction threshold is four times higher than the KTP threshold. The nonlinear coefficient is one-third that of the KTP crystal, with a large allowed angle and a tiny deviation angle. The two pass surfaces of LBO are coated with a two-color antireflection coating for 1064 nm and 532 nm with Class I phase matching.

Feature

High photon energy

Short wavelength

Sensitive to the human eye

Regular light spot

Long distance in water

Small divergence angle

Application

Underwater Imaging Technology

The distance gating technique employs a pulsed laser and a strobe camera to separate scattered light at various distances from reflected light of the target scene based on pulse emission and imaging time, so that the radiation pulse reflected from the target scene arrives at the camera and imaging within the camera strobe opening time. Flash-pumped Nd:YAG lasers are used in the majority of underwater distance gating imaging systems and other three-dimensional underwater imaging systems. The gadget is mature in terms of technology, affordable in price, and has a 1106Lm output wavelength. 532nm green light may be obtained by doubling the frequency. The average power can now reach several tens of watts, with a working distance of several kilometers.

Underwater Communication

High communication rate, cheap cost, compact instrument, easy integration, and exceptional secrecy are all benefits of underwater communication technology based on visible light. Underwater visible light communication can reach faster communication speeds and a larger communication bandwidth thanks to the high modulation rate of laser modulation and high single-pulse energy.

 

Verdict

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