What is the 532nm laser that can be used in optical communication application?
532nm laser being used for underwater optical communication
The laser spot is as uniform as possible, and the 532nm Nd:YAG laser with electro-optic Q-switching can be used for these aspects 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.
Theory of crylink’s 532nm Nd YAG Laser
Laser Crystal - Nd:YAG
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 10ns20ns, the repetition frequency is about 50Hz, and the divergence angle is generally less than 0.1mrad, the 532nm Nd:YAG laser with electro-optic Q-switchingcan be used for these aspects.
EO Q-Switch - LiNbO3
Q-switching technology must concentrate the energy into a single pulse in order to reach high peak power. LiNbO3 has a strong electro-optic coefficient, acousto-optic coefficient, and nonlinear performance. It's used in photo regulators, waveguide material substrates, and Nd laserQ-switches, among other things. Water insoluble, difficult to deliquesce, does not require sealed storage, minimum transmission loss, stable chemical, and mechanical properties.
Frequency Doubling - LBO
A LBO crystalis 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 uses a pulsed laser and a strobe camera to separate scattered light 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. The bulk of underwater distance gating imaging systems and other three-dimensional underwater imaging systems employ flash-pumped Nd:YAG lasers. The device is technologically advanced, reasonably priced, and has a 1106Lm output wavelength. By increasing the frequency, 532nm green light may be produced. With a working distance of several kilometers, average power may now approach several tens of watts.
Underwater Communication
The advantages of underwater communication technology based on visible light include a high communication rate, low cost, compact instrument, easy integration, and outstanding secrecy. Due to the high modulation rate of laser modulation and high single-pulse energy, underwater visible light communication can achieve quicker communication rates and a bigger communication bandwidth.
Verdict
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