EYE SAFE LASER CRYSTAL - An Overview
EYE SAFE LASER CRYSTAL - An Overview
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In summary, we attained a 1485 nm eye-safe intra-cavity diamond cascaded Raman laser with significant peak electrical power and slender linewidth. Benefitting from the use of composite crystal As well as in-band pumping and The nice manner matching provided by the V-shaped folded cavity, the unit obtained a median output electric power of 2.
Although these lasers work at wavelengths which can be more unlikely to bring about retinal damage, they are not completely harmless. Inappropriate handling and misuse can even now lead to likely harm, including eye injuries.
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By utilizing mirrors with specifically intended transmissions in the diode conclude-pumped hemispherical cavity, laser oscillations apart from 1580 nm had been suppressed and an Improved pulse effectiveness of the…
A LED-array-pumped Nd:YAG laser with optical conversion efficiency up to 20.2% is shown by direct aspect-pumping with no coupling lens by using the productive pump plan.
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Correspondingly, the beam radius of the fundamental laser on the diamond may be very well retained under one hundred µm. The above mentioned final results indicate that the V-formed folded cavity On this perform has an excellent thermal stability, which is able to make certain a superior efficiency, Particularly a high output ability in the next.
Eye-safe lasers also possess important prospective for long term technological advancements. Their inherent safety attributes could allow the event of recent apps which were Beforehand untenable as a result of safety issues.
A person Principal software is wind velocity measurement. Higher-power LIDAR devices utilizing Tm:YAG crystals can undertaking laser beams to substantial altitudes to evaluate wind speed and route with check here amazing accuracy.
Determine 5(a) displays the heartbeat width and peak ability of the 2nd-Stokes laser as being a purpose of the incident pump electrical power at 50 kHz. The pulse width is a lot less than two ns and it decreases While using the rising pump depth. The pulse width could possibly be as narrow as 1.1 ns at 27.two W, which can be noticeably shortened in comparison with that of the basic laser and could be mainly attributed to the Raman pulse compression[fifteen]. In addition, the cascaded Raman approach can also improve the outcome of the heartbeat compression[43]. Additionally, this kind of a short pulse width might also have arisen through the shorter Raman cavity, that may lessen the spherical vacation time on the Stokes photons and make the Construct-up from the Stokes laser pulse more quickly. Correspondingly, the height power of just one pulse reaches as many as 40 kW. This is the best peak power ever documented for the eye-safe diamond Raman lasers to the ideal of our knowledge. The typical output electrical power and peak power as being a functionality from the PRF are proven in Fig.
Yb:Er:glass crystals have carved a singular niche in distant sensing and LIDAR units. Their large optical obtain and emission wavelength in the attention-safe area make them an excellent prospect for this kind of purposes.
eight%. So as to protect against damage to the laser crystals and also the cavity mirrors, we didn't more boost the incident pump power in the course of the experiments. The above mentioned success confirm that the folded cavity is well intended and maintains fantastic balance under this type of high pump level. Determine three(b) exhibits the basic laser emission spectrum, which provides a spectral width of 0.fifteen nm. One pulse shape of the fundamental laser having a pulse width of sixty ns is shown while in the inset of Fig. three(b). Since the extended cavity duration tends to result in a number of longitudinal manner oscillations, it is probably going the many peaks of the basic laser pulse shape are because of the beat frequency of multiple fundamental longitudinal modes[36].
Yb:Er:glass is often Utilized in length measurements, environmental checking, and protection applications as a consequence of its substantial acquire. Tm:YAG is fitted to higher-ability programs like wind velocity measurements and atmospheric experiments.
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Though Yb:Er:glass gives high optical get and an eye-safe emission wavelength, Tm:YAG is more suited to high-electrical power purposes. Inside the realm of remote sensing and LIDAR apps, both equally crystals demonstrate to generally be indispensable property, ensuring eye safety when also catering to various precise specifications.