Not known Details About EYE SAFE LASER CRYSTAL
Not known Details About EYE SAFE LASER CRYSTAL
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This facet of high optical achieve not merely allows for a strong performance but in addition encourages performance. The much less Strength needed to make a potent laser beam, the more useful resource-efficient the laser program gets.
In distance measurement, for instance, the substantial optical achieve of Yb:Er:glass permits the production of extreme laser beams that can journey very long distances without having major attenuation.
We report with a superior typical energy and substantial repetition amount nanosecond pulsed eye-safe KGW Raman laser intracavity pushed by an acousto-optic Q-switched 1342 nm two-crystal Nd:YVO4 laser. Taking advantages of the very carefully picked two-composite-laser-crystal configuration, the totally optimized gate-open up time of acousto-optic modulator and also the ingeniously designed U-formed resonator, significant power and efficiency enhancements and top-quality manner matching are actually enabled.
The effectiveness and efficiency of any laser technique are mostly dictated by its acquire parameters. The two Yb:Er:glass and Tm:YAG display unique features in this aspect, Each and every leveraging its special attributes to get noticed in the wide spectrum of laser crystals.
Determine four(b) offers the next-Stokes emission spectrum for 27.two W incident pump power. It may be observed that only the second-Stokes emission is usually noticed, even though the fundamental and the first-Stokes emission is often barely seen. This is mainly attributed towards the effective Raman conversion plus the reduced transmission at the elemental laser and the primary-Stokes laser of the output coupler M4. Based on the Raman laser theoretical product[39], as a way to know productive second-Stokes lasers, the edge of the second-Stokes laser is necessary to become sufficiently better than that of the very first-Stokes laser so the strong to start with-Stokes discipline may be founded, which properly depletes the basic laser and raises the 2nd-Stokes achieve. The coating style and design of output coupler M4 recognized successful cascaded Raman conversion. On top of that, the Raman conversion performance was also successfully improved by minimizing the spot size of the elemental laser over the diamond and altering the polarization way of the basic laser to match the path of diamond �?11�? The really fixed spectrum of the second-Stokes emission is demonstrated in the inset of Fig. 3(b), which shows a Centre wavelength Situated at 1485.nine nm and also a resolution-confined linewidth of only 0.
To sum it up, the superior optical get of Yb:Er:glass and also the spectacular electrical power managing of Tm:YAG underline their respective strengths. These acquire parameters offer you a must have insights into their efficiency, letting researchers and engineers to choose the best suited laser crystal for his or her specific wants.
Correspondingly, the beam radius of the basic laser around the diamond might be perfectly saved below 100 µm. The above mentioned benefits point out that the V-formed folded cavity During this get the job done has a fantastic thermal steadiness, that will make certain a high efficiency, especially a substantial output energy in the following.
The fight involving these two types of laser crystals is centered all around their emission wavelengths, achieve, and programs. Enable’s dissect The 2 and see how they square off from each other.
The 1.5 µm wavelength location is particularly fascinating mainly because it coincides With all the minimum amount water absorption in biological tissue. This attribute can make Yb:Er:glass an ideal choice for biomedical programs, where by it’s required to minimize opportunity tissue damage.
Determine five(a) exhibits the heart beat width and peak electric power of the next-Stokes laser as being a functionality from the incident pump energy at 50 kHz. The heart beat width is below 2 ns and it decreases with the expanding pump intensity. The heart beat width could possibly be as slender as 1.1 ns at 27.2 W, which can be noticeably shortened in comparison with that of the fundamental laser and will be primarily attributed to your Raman pulse compression[15]. Also, the cascaded Raman course of action can also enrich the outcome of the pulse compression[43]. Additionally, this sort of a short pulse width may additionally have arisen through the shorter Raman cavity, that will reduce the round trip time in the Stokes photons and make the Create-up of your Stokes laser pulse speedier. Correspondingly, the height electric power of one pulse reaches around 40 kW. Here is the maximum peak electrical power at any time claimed for that eye-safe diamond Raman lasers to the very best of our understanding. The average output power and peak ability for a operate from the PRF are demonstrated in Fig.
Substantial regular ability and high repetition price eye-safe Raman laser driven by a two-crystal Nd:YVO4 laser
By running at wavelengths which are more unlikely to induce retinal injury, these lasers substantially cut down the risk of accidental eye harm for the duration of operation, An important characteristic thinking about the sensitivity in the human eye as well as the extreme outcomes of ocular injuries. This characteristic tends to make eye-safe lasers ideal for environments where laser use is popular, or wherever the chance of unintentional eye exposure is significant.
Yb:Er:glass is often used in length measurements, environmental checking, and defense purposes resulting from its large acquire. Tm:YAG is fitted to substantial-energy purposes like wind velocity measurements and atmospheric reports.
An additional probable danger arises from lasers meant to be eye-safe under particular running conditions. Variations to these circumstances, for instance growing the laser electric power or modifying the beam’s concentrate, can change the laser’s output into non-eye-safe locations.
The usage of eye-safe lasers in professional more info medical procedures, particularly Individuals involving the eyes, has actually been innovative. These lasers have Increased the safety of fragile surgical procedures, rendering it probable to perform intricate functions with significantly reduced challenges to people�?vision.