The fight of eye-safe laser crystals, Yb:Er:glass and Tm:YAG, is not a great deal of a struggle as It is just a complementary relationship. Equally crystals give distinctive benefits, as well as their collection relies on the desired software.
Additionally, this outstanding ability managing ability also contributes to the long operational life and trustworthiness of Tm:YAG crystals.
In spite of the numerous strides in safety that eye-safe lasers have brought about, they aren't devoid of their pitfalls.
The efficiency and usefulness of any laser method are mainly dictated by its achieve parameters. Both Yb:Er:glass and Tm:YAG reveal distinct attributes During this element, Just about every leveraging its exceptional characteristics to stand out inside the wide spectrum of laser crystals.
Determine four(b) offers the next-Stokes emission spectrum for 27.2 W incident pump ability. It may be observed that only the second-Stokes emission might be noticed, although the basic and the very first-Stokes emission could be hardly found. This is especially attributed towards the economical Raman conversion in addition to the lower transmission at the elemental laser and the very first-Stokes laser with the output coupler M4. In accordance with the Raman laser theoretical model[39], in order to comprehend productive next-Stokes lasers, the edge of the 2nd-Stokes laser is needed for being adequately increased than that of the very first-Stokes laser so the strong initially-Stokes field is usually proven, which efficiently depletes the basic laser and increases the next-Stokes achieve. The coating design of output coupler M4 realized effective cascaded Raman conversion. Moreover, the Raman conversion efficiency was also correctly enhanced by reducing the spot dimension of the fundamental laser to the diamond and adjusting the polarization path of the fundamental laser to match the direction of diamond �?11�? The very solved spectrum of the 2nd-Stokes emission is demonstrated in the inset of Fig. 3(b), which reveals a Centre wavelength Positioned at 1485.nine nm along with a resolution-restricted linewidth of only 0.
Improvement of steadiness and performance in diode-pumped passively Q-switched intracavity optical parametric oscillator which has a monolithic cavity
Correspondingly, the beam radius of the fundamental laser about the diamond can be properly held down below one hundred µm. The above mentioned outcomes point out which the V-formed folded cavity During this function has a very good thermal security, which can guarantee a higher performance, Specifically a large output electric power in the subsequent.
The fight concerning both of these varieties of laser crystals is centered about their emission wavelengths, achieve, and programs. Allow’s dissect The 2 and see how they sq. off from each other.
The one.five µm wavelength region is particularly fascinating as it coincides with the least h2o absorption in biological tissue. This characteristic can make Yb:Er:glass an ideal option for biomedical applications, the place it’s necessary to lower potential tissue harm.
Determine 5(a) reveals the heart beat width and peak energy of the second-Stokes laser as a purpose of the incident pump energy at 50 kHz. The pulse width is fewer than two ns and it here decreases With all the escalating pump intensity. The heartbeat width could be as narrow as 1.1 ns at 27.two W, which happens to be drastically shortened compared to that of the basic laser and will be primarily attributed for the Raman pulse compression[fifteen]. Also, the cascaded Raman method may boost the outcome of the heart beat compression[forty three]. Moreover, such a short pulse width might also have arisen with the shorter Raman cavity, that will reduce the round trip time in the Stokes photons and make the Construct-up in the Stokes laser pulse more rapidly. Correspondingly, the peak electric power of a single pulse reaches up to 40 kW. This is actually the optimum peak electricity ever claimed for your eye-safe diamond Raman lasers to the top of our knowledge. The standard output power and peak power being a purpose with the PRF are shown in Fig.
Superior typical power and high repetition amount eye-safe Raman laser pushed by a two-crystal Nd:YVO4 laser
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This vital safety feature is especially useful in scenarios in which laser use is popular or in situations where inadvertent eye exposure is a real risk.
Among the numerous characteristics of Yb:Er:glass is its substantial optical achieve. Basically, Which means a small input of Power can lead to an important output of laser light-weight.
Among the numerous characteristics of Yb:Er:glass is its significant optical acquire. Effectively, Which means that a small enter of Strength may end up in a significant output of laser gentle.