Figure 4 measured ibs coating performance for a 294

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Figure 4. Measured IBS coating performance for a 2.94 μm 45° High Reflector, with partial transmission from 635-655 nm, deposited on a sapphire substrate. Figure 5. An example temporal pulse shape for an Er:YAG laser operating in the ‘long-pulse’ regime. The temporal profile is generally not as smooth as a Q-switched pulse and the peak power is lower, but the integrated energy per pulse is much higher. This pulse shape is more representative of the conditions for the dental and dermatology industries. Table 1. Lower limit for the LDT under CW operating conditions. In each case, the maximum available power for the Cr:ZnSe laser was reached, without any observable damage. SUMMARY AND ACKNOWLEDGMENTS The data presented in this paper indicate that IBS coatings will likely become the performance leader for high power optics in the 2-3 μm spectral region, similar to the position they hold in the near-UV to near infrared. Much more data is still to be obtained, but the preliminary results show generally very high LDT values and very low absorption. These two characteristics ensure successful coating developments for a wide variety of high power optics. Future testing may involve detailed absorption measurements at 3 μm, further pulsed LDT testing for a variety of coatings, evaluation of high power 2 μm coatings on optical fiber, and extension of high power IBS coatings further into the infrared. We thank Ashot Markosyan of Stanford University for photothermal absorption measurements at 2 μm. We would also like to thank the mid-infrared group at IPG Photonics for several of the LDT measurements presented here. Wavelength Estimated LDT, limited by CW Power Density 2.4 μm > 767 kW/cm 2 2.5 μm > 212 kW/cm 2 2.6 μm > 170 kW/cm 2 2.7 μm > 133 kW/cm 2
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Advanced Thin Films | 5733 Central Avenue, Boulder, CO 80301 | Ph: 303-815-1545 | REFERENCES [1] Sorokina I.T., Vodopyanov, K.L. (Eds.): [Solid-State Mid- Infrared Laser Sources], Topics Appl. Phys. 89 (2003), © Springer-Verlag Berlin Heidelberg 2003. [2] Harris, D. C., [Materials for Infrared Windows and Domes: Properties and Performance], SPIE PRESS Monograph, Vol. PM70 (1999). [3] Jean, B. , Bende, T., “Mid-IR Laser Applications in Medicine”, Solid-State Mid-Infrared Laser Sources, Topics in Applied Physics, 2003, Volume 89/2003, 530-565, DOI: 10.1007/3-540-36491-9_12. [ 4] Serebryakov, V.A., Bo ĭ ko, É.V., Petrishchev, N.N., and Yan, A.V., “Medical applications of mid-IR lasers. Problems and prospects,” J. Opt. Technol. 77, 6-17 (2010). [5] Sanamyan, T., Simmons, J. F., and Dubinskii, M., “Diode-Pumped Er3+:Y2O3 Ceramic Laser at ~3- μm,” in Advanced Solid-State Photonics, OSA Technical Digest Series (CD) (Optical Society of America, 2010), paper AMC3. [6] Segi, T., Shima, K., Sakai, T., and Hosoya, H., “3- μm-band high output erbium-doped fiber lasers,” in Conference on Lasers and Electro- Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, Technical Digest (CD) (Optical Society of America, 2004), paper CThZ5.
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