https://www.gamdan.com/blog daily 0.75 2026-04-02 https://www.gamdan.com/blog/lbo monthly 0.5 2025-10-14 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/1606932829035-UOLHY2CX5ADF03ZOAPCC/Lithium.png Blog - Getting To Know LBO https://www.gamdan.com/blog/nonlinear-optics-coating-design monthly 0.5 2026-02-16 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/8614c75a-f60a-45aa-b564-ebc5443dd06d/1.png Blog - NONLINEAR OPTICS COATING DESIGN - Make it stand out PHOTO CREDIT: https://www.cressphotography.com/ https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/8121fd57-3e69-4462-80e2-c52c1327bba3/Vacuum_Innovations_Chamber+ELI+Beamlines.jpeg Blog - NONLINEAR OPTICS COATING DESIGN - Make it stand out Figure 1: A coating chamber. Image sourced with permission: Vacuum Innovations https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/a705e213-cac4-42ee-a52c-cc5ebe0cfe8b/VI-rotationbottomangle2_edited_edited_jp.jpeg Blog - NONLINEAR OPTICS COATING DESIGN - Make it stand out Figure 2: A planetary rotation system holds and moves optical substrates inside a coating chamber. Image sourced with permission: Vacuum Innovations https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/6268b61c-c5e3-4a0f-b76f-e7b3fc6a3ffb/LiDT+Results+Graph.png Blog - NONLINEAR OPTICS COATING DESIGN - Make it stand out Figure 3. A wide range of results are common when doing laser induced damage testing, in this case with nanosecond 1064 nm laser pulses. Note the huge difference between the fluence levels that damage the best and the worst performing parts. Image taken from the book of the proceedings of the 2014 SPIE Laser Damage Symposium, SPIE Volume 9237, paper 9237 0N: Stolz et al., 1064-nm Fabry-Perot Transmission Filter Laser Damage Competition. https://www.gamdan.com/blog/coatings-for-nonlinear-optics monthly 0.5 2025-10-14 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/fc389791-056e-45c2-b38b-f6c606eb272f/2.png Blog - COATINGS FOR NONLINEAR OPTICS - Make it stand out Image Source Credit: LIDARIS https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/cc2dafbd-b06d-4968-bcad-8221e97272fd/lbo.png Blog - COATINGS FOR NONLINEAR OPTICS - Make it stand out Figure 1. LBO crystals that have optical coatings on their input surface. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/b74d880e-dca7-415b-abb2-9638def6da1b/elaboration+of+hand+drawing+%281%29.png Blog - COATINGS FOR NONLINEAR OPTICS - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/b0ec1be9-5854-4872-943c-65e5a6ea9642/2.png Blog - COATINGS FOR NONLINEAR OPTICS - Make it stand out Figure 4. Nanosecond laser-induced damage on the dielectric coating measured in the vacuum environment. (Photo used with permission from LIDARIS LIDT Service.) https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/24e76d3f-35ef-4a4c-bd23-93a8471d20a7/3.png Blog - COATINGS FOR NONLINEAR OPTICS - Make it stand out Figure 5. Femtosecond laser-induced damage on the dielectric coating. (Photo used with permission from LIDARIS LIDT Service) https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/2899ed00-a8cf-445c-bdcc-fd563f09ceb5/single+coating.jpg Blog - COATINGS FOR NONLINEAR OPTICS - Make it stand out Figure 2. Adding a simple single-layer quarter-wave (λ/4) dielectric coating to a substrate can reduce the net reflectivity for light going into the substrate. In this illustration, light is shown reflecting from the air-to-coating interface and from the coating-to-substrate interface. Together these two reflections come close to cancelling each other because the round-trip distance through the coating is half the wavelength of the light, and consequently these two waves are out of phase. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/01ba2faa-d82f-4165-aef9-9ace74a76979/Figure+2.png Blog - COATINGS FOR NONLINEAR OPTICS - Make it stand out Figure 3. A multi-layer coating consisting of a stack of HfO2 and SiO2 layers shown as an end-view with SEM imaging. Filipescu, M., A. Palla-Papavlu, A. Bercea, L. Rusen, M. O. Cernaianu, V. Ion, A. Calugar, L. C. Nistor, and M. Dinescu. "Antireflective coatings with high damage threshold prepared by laser ablation." Applied Physics A 125 (2019): 1-12. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/463db2c6-1741-49bd-8a35-3d3d07004ba6/Coating+Crazing+2.jpg Blog - COATINGS FOR NONLINEAR OPTICS - Make it stand out Figure 6. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/a01dff26-95b6-44d3-aa2d-ff9cfda97810/coating+crazing.jpg Blog - COATINGS FOR NONLINEAR OPTICS - Make it stand out Figure 7. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/92b74b8a-d3c9-4afc-819d-b1d7a7c081e9/Crazed-Paint.jpg Blog - COATINGS FOR NONLINEAR OPTICS - Make it stand out Figure 8. A crazed / cracked coating. In this case it is paint, not a thin film dielectric, but this image presents a better understanding of the concept of why this happens, which is the same with a thin film or a thick film. (Photo Credit Source) https://www.gamdan.com/blog/interferometry-fringes-and-phases monthly 0.5 2025-10-14 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/625e3db1-3f0f-457b-95ed-d3c72ac326d4/optical+test+flat.jpg Blog - INTERFEROMETRY - FRINGES AND PHASES - Make it stand out Source: https://m.wikidata.org/wiki/Q2098218 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/3a29d612-d91a-4692-bef4-f528cbd9a0a4/photon+%28400+x+400+px%29.png Blog - INTERFEROMETRY - FRINGES AND PHASES - Make it stand out Protons and neutrons in atomic nucleus and orbiting electrons https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/fe719558-1de7-4449-a3ea-fb9ed43b1275/Interference-fringes-generated-by-the-double-interferometer-configuration-the-left.png Blog - INTERFEROMETRY - FRINGES AND PHASES - Make it stand out Source : Interference Fringes https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/9e45d00f-0b4c-4016-a4b0-1a3f70f2e040/interferometer.jpg Blog - INTERFEROMETRY - FRINGES AND PHASES - Make it stand out Interferometer https://www.gamdan.com/blog/nonlinear-crystals-for-generating-uv-light monthly 0.5 2025-10-15 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/80ce6e79-96ba-41f1-9039-2d43943c3d80/UV+light+image.jpg Blog - NONLINEAR CRYSTALS FOR GENERATING UV LIGHT - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/9d27b9dc-eda3-4fbd-8734-48915da3a669/Nd%3AYAG+Crystals+Harmonics+Table.png Blog - NONLINEAR CRYSTALS FOR GENERATING UV LIGHT - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/03491feb-7a2b-455b-9a64-7681a1453b72/UV+Light+Stock+Photo.png Blog - NONLINEAR CRYSTALS FOR GENERATING UV LIGHT - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.gamdan.com/blog/what-is-wavefront-distortion monthly 0.5 2025-10-14 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/7516d77c-6c7e-4876-a874-7ebf27d2e7d3/wave_distortions.png Blog - WHAT IS WAVEFRONT DISTORTION? - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/f347df16-359b-434d-a930-b2c8a3a5b00e/distortion_of_a_fringe_pattern.png Blog - WHAT IS WAVEFRONT DISTORTION? - Make it stand out Figure 1: Irregular part with local discontinuities. Source: https://www.researchgate.net/figure/a-Image-of-the-object_fig4_228712678 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/850e465b-c35c-46d9-b816-598e23fd74fd/Astigmatism_smooth_distortion.png Blog - WHAT IS WAVEFRONT DISTORTION? - Make it stand out Figure 2: Astigmatism (saddle shaped) with smooth distortion. Source: https://www.semanticscholar.org/paper/Distortion-matrix-approach-for-ultrasound-imaging-Lambert-Cobus/2ef9346361f4f687d72cfeed30ff34d6cbe5ae99/figure/3 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/570e13fb-e3c2-46c0-98d7-43522189f89b/I-gram+230713b+Convex+Sphere.jpg Blog - WHAT IS WAVEFRONT DISTORTION? - Make it stand out Figure 3: Interferogram showing one-half fringe (quarter wave) spherical distortion. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/9d02a886-6bc2-4599-bbbd-de8584f19049/I-gram+230713a+Hole+and+a+Roll+01.jpg Blog - WHAT IS WAVEFRONT DISTORTION? - Make it stand out Figure 4: Slightly convex part with low depression in center and rolled down edge. A “Hole with a Roll” https://www.gamdan.com/blog/contamination-on-ultraviolet-uv-optics monthly 0.5 2025-10-15 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/fdc4337e-bbff-4146-84f2-9adde31ef71f/examining_with_magnifying_glass.png Blog - CONTAMINATION ON ULTRAVIOLET (UV) OPTICS - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/839a3edc-0009-4210-b7f6-b79085ad730a/uv+filter+lens+stock+image+for+gamdan.jpg Blog - CONTAMINATION ON ULTRAVIOLET (UV) OPTICS - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/65eb35c5-ec4f-47b2-9cfd-3688ec510df5/copper_wire+_in_casing.jpg Blog - CONTAMINATION ON ULTRAVIOLET (UV) OPTICS - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/ff66ddc5-5704-46bd-b6ff-671eccd13714/shutterstock_98583062.jpg Blog - CONTAMINATION ON ULTRAVIOLET (UV) OPTICS - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/f64d2423-b93a-4f4d-8710-c3697733f14b/LBO_Crystal_Gamdan_Optics.jpg Blog - CONTAMINATION ON ULTRAVIOLET (UV) OPTICS - Make it stand out USA Grown LBO Boule (Lithium Triborate) https://www.gamdan.com/blog/estimates-of-second-harmonic-generation-shg-efficiency monthly 0.5 2026-02-16 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/5e912fa9-15c6-4b20-a484-01d711a7d3fa/second_harmonic_generation_waves.jpg Blog - Estimates of Second Harmonic Generation (SHG) Efficiency - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/e8ad45e6-96e7-47e2-b15a-fa90acfc4940/SGH+Figure+1.jpg Blog - Estimates of Second Harmonic Generation (SHG) Efficiency - Make it stand out Figure 1. Second harmonic generation is a nonlinear process. The efficiency often increases nearly linearly with input laser power until reaching about 20%, and then the efficiency starts to saturate more significantly, meaning it doesn’t keep increasing at the same rate. The curve here is meant only to illustrate the behavior of a very well optimized SHG experiment. The maximum efficiency differs with each situation. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/47a3b017-c03c-4049-91d0-704397b7e74f/best+efficiency+for+SHG.png Blog - Estimates of Second Harmonic Generation (SHG) Efficiency - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/15cf9256-cef7-471b-a133-20b0702248a3/Screenshot+2023-06-06+at+10.35.48+AM.png Blog - Estimates of Second Harmonic Generation (SHG) Efficiency - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/5fefca71-449f-4436-b0d8-3b4a1cda245b/SGH_Equation_1_Power_Out Blog - Estimates of Second Harmonic Generation (SHG) Efficiency - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/b864559f-dafd-463f-8b47-99103a007bf3/SGH+Efficiency+Equation+2 Blog - Estimates of Second Harmonic Generation (SHG) Efficiency - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/b9170d61-96c2-46d2-8dce-324ad85d2e2c/Second_Harmonic_Generation_Image.jpg Blog - Estimates of Second Harmonic Generation (SHG) Efficiency - Make it stand out Figure 2. When SHG conversion efficiency is limited by the power in the beam, optimal focusing on the nonlinear crystal (b) keeps the input beam small throughout all of the crystal and optimizes the SHG efficiency. Focusing too tightly (a) or not tightly enough (c) will give larger less intense beams in most (or all) of the crystal and will lower the net nonlinear conversion efficiency. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/204fe8f2-3984-41fd-9aa1-8cdc50038e21/SGH_Equation+3.png Blog - Estimates of Second Harmonic Generation (SHG) Efficiency - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/ca9f9f86-4676-4b64-aa5a-1faeee4b3b4f/SGH+Efficiency+Equation+4 Blog - Estimates of Second Harmonic Generation (SHG) Efficiency - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/8376daa2-d1c9-4ae4-9b5a-71b2127cc286/Screenshot+2023-06-06+at+10.50.23+AM.png Blog - Estimates of Second Harmonic Generation (SHG) Efficiency - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.gamdan.com/blog/profilometry monthly 0.5 2025-10-14 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/1682715379695-FYYJCYI7FLB12AWK2S6J/purple+swirl+waves.jpg Blog - Profilometry - An Overview - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.gamdan.com/blog/more-on-interferometry monthly 0.5 2025-10-14 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/1681424559926-060CRWGWWN21U5TG6T3A/green+beams+interferometry Blog - More On Interferometry - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/caa18e16-082d-40ad-a15a-0a83d691389e/Interferometry+Wave+Gamdan+Optics+%283%29.jpg Blog - More On Interferometry - Make it stand out Fig. 1 The lower two red lines show equal intensity wavefronts perfectly in phase. They interfere to be a single wavefront with highs and lows exactly double those, as shown in the top red line. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/90aa5260-cbbf-4a8a-851e-68e3bfc41f55/Interferometry+Gamdan+Optics.png Blog - More On Interferometry - Make it stand out Fig. 2 The lower two red lines again show equal intensity, but out of phase by a half-wave , 180 degrees. The highs and lows add to zero, and the resultant wave appears above, a flat line. https://www.gamdan.com/blog/subsurface-damage monthly 0.5 2026-02-06 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/e0eb177b-fafc-4912-aed6-14ec7f24d30d/blog+banner-3.jpeg Blog - Subsurface Damage - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/5dd0e2ba-31d0-4c60-98e5-28d9b8a858ab/SuperPolished_GamdanOptics_Figure_3.jpg Blog - Subsurface Damage - Make it stand out Figure 3 - Gamdan Optics Super Polished https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/52ce85c5-ecc9-4d39-bee7-97f8b23a8f10/SSD_Figure_1.jpg Blog - Subsurface Damage - Make it stand out Figure 1 - Traces of SubSurface Damage in Micrscope. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/80055358-3d47-4d3c-a75c-0340296c3c40/Subsurface+Damage.jpg Blog - Subsurface Damage - Make it stand out Figure 2 - Surface left exposed causing SubSurface Damage https://www.gamdan.com/blog/optical-parametric-oscillators-different-crystals-for-different-opos monthly 0.5 2025-10-14 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/d3b6b51c-bfb3-45dc-aa20-b5ae0a072924/blog+banner-2.jpeg Blog - Different Crystals for Different OPOs - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/03042cab-4e92-4edb-bd82-275241dc5c24/LBO_Gamdan.jpeg Blog - Different Crystals for Different OPOs - Make it stand out GAMDAN Optics LBO Crystal https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/7a0a8694-bc3a-4e53-a6aa-2e041dca1daf/SSC01087-Edit-Edit.jpg Blog - Different Crystals for Different OPOs - Make it stand out GAMDAN OPTICS KTP CRYSTAL https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/9bcb00da-f1eb-453c-a8a7-49aa84f44a44/BBO-Crystal-380x253.jpg Blog - Different Crystals for Different OPOs - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/1ba1c7c7-9e14-4f9a-8522-9a1a3cb9a07c/Screenshot+2023-01-23+at+12.36.16+PM.png Blog - Different Crystals for Different OPOs - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.gamdan.com/blog/optical-parametric-oscillators-types-of-opos monthly 0.5 2025-10-14 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/6b34b7a2-04ce-4535-9fec-fe524faed1a1/multi+color+prism.jpg Blog - Types of OPO’s - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/f20aaab6-4b5e-4555-b27b-8e6b7dc03d24/OPO_Figure_3.jpg Blog - Types of OPO’s - Make it stand out Figure 3. Example of an optical parametric oscillator (OPO) in a linear configuration, as opposed to a ring configuration. An input pump beam, shown in blue, is transmitted by mirror 1 and enters the nonlinear crystal where it generates a signal beam, shown in green, and an idler beam, shown in red. Mirror 2 transmits the idler and is partially transmissive (partially reflective too) for the signal. Mirror 1 is a high reflector for the signal. When this OPO is operating, the signal beam circulates between the mirrors as shown in green. This OPO is singly resonant since only the signal is resonant between the mirrors. The output is the signal and idler plus some residual pump light. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/da5890fd-9fcf-4b0b-a38e-9d79cb1db5b2/OPO_Figure_4.jpg Blog - Types of OPO’s - Make it stand out Figure 4. A ring resonator for an OPO in a “bow tie” configuration. In this example, only the signal is resonant. The signal is the green light. Mirror 1 transmits the pump. Mirror 2 transmits the idler and partially transmits the signal. Mirrors 3, 4, and 1 are high reflectors for the resonant signal. The output signal and idler beams, plus some residual pump beam light, all pass out through mirror 2 in this example. Many other design variations are possible. https://www.gamdan.com/blog/optical-parametric-oscillators monthly 0.5 2025-10-14 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/fc30e0c1-7ab0-411f-8d35-8c5deaac08a6/laser+light+beams Blog - OPO Process and How They Work - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/0d1f4b80-b29d-46db-8885-4374bb9f4d0e/OPO_Figure_1.jpg Blog - OPO Process and How They Work - Make it stand out Figure 1. Example of a sum generation process in a nonlinear crystal that combines photons from two beams of light to make a sum-frequency beam with a shorter wavelength, and which has more energetic photons. Here red plus green converts to blue (or ultraviolet). The crystal is typically temperature controlled. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/33350f23-20ad-46d8-85b0-b6ccd095c3b9/OPO_Figure_2.jpg Blog - OPO Process and How They Work - Make it stand out Figure 2. Example of an optical parametric process in a nonlinear crystal that converts each photon from a short wavelength beam into two photons, each less energetic than the pump photons. Here blue (or ultraviolet) converts to red plus green. The crystal is typically temperature controlled. https://www.gamdan.com/blog/walkoff-problems-and-compensation monthly 0.5 2025-10-14 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/2f4d5a5d-e3bc-44a6-88f4-15a4f33c84fd/light+beam+%282500+%C3%97+1500+px%29.jpg Blog - Walkoff Problems and Compensation - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/8c344a61-9eee-42d5-8884-8c386a5d7dd9/Figure_6.jpg Blog - Walkoff Problems and Compensation - Make it stand out Figure 6. A pair of identical LBO crystals can be used, one after the other, as shown in the top view. In this case, if there is any Poynting Vector walkoff, the amount of walkoff is twice as much in two crystals as it would be in one. However, if the second crystal is rotated 180 degrees around the x1 axis, as illustrated below, then the walkoff in the first crystal is reversed in the second crystal. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/6fcd7694-044e-4aac-bc45-4d93cd56aff1/Figure_7.jpg Blog - Walkoff Problems and Compensation - Make it stand out Figure 7. Infrared and green beams overlap as they enter a THG crystal. The wavefronts of the green and red beams are parallel in air going into the crystal. The wavefronts are not quite parallel inside the crystal due to dispersion. However, the walkoff and the dispersion can be chosen to cancel each other! UV light is generated in the crystal, as shown in Fig. 8. Note that the IR, green, and UV beams will not be going in exactly the same directions when these beams exit the crystals and return to air. This is a very unusual birefringent prism! https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/7b49d1b5-38c5-4200-947c-0356f090c6b7/UV_Green_IR_LBO_Figure_8.jpg Blog - Walkoff Problems and Compensation - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.gamdan.com/blog/introduction-to-walkoff monthly 0.5 2025-10-15 https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/8a0b1828-0b88-4a24-9aa3-8947670d9440/Prism+light+through+optics.jpg Blog - Introduction to Walkoff - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/3c381b6c-d468-4e69-aaaa-c631bb3005d9/wavefronts_walkoff_figure_1.jpg Blog - Introduction to Walkoff - Make it stand out Figure 1. Blue and red beams passing through glass experience dispersion, a deviation in direction at the surfaces. The blue deviates more. This deviation is exaggerated beyond what is typical to allow it to be obvious in the drawing. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/371b1bda-0829-4250-8572-47f5b9a85db2/Figure+2.png Blog - Introduction to Walkoff - Make it stand out Figure 2. Blue and red beams passing through glass at normal incidence. Neither beam’s direction deviates. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/b5f2d00c-9d5a-4655-b1fd-9b614051395b/Birefringgent_Crystal_Figure_3.jpg Blog - Introduction to Walkoff - Make it stand out Figure 3. Blue and red beams propagate through an anisotropic (birefringent) crystal. The blue and red beams are assumed to have orthogonal linear polarizations. There may be walkoff at an angle ρ in the crystal, as shown. After the beams exit the crystal the direction of energy flow becomes parallel, meaning there is no more walkoff outside the crystal. https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/748bb7a1-74d5-4884-9122-b72168bbd258/Figure+4.jpg Blog - Introduction to Walkoff - Make it stand out Figure 4. Two beams are shown, one blue and the other red. If these two beams originally overlapped, can you tell from looking at this drawing if they became separated by dispersion or by walkoff? https://images.squarespace-cdn.com/content/v1/5d719be48ad44900015c23b4/7a656e5e-0ec1-4c1d-b3a0-0f3336c408ed/Figure+5.jpg Blog - Introduction to Walkoff - Make it stand out Figure 5. Second harmonic generation (SHG) followed by third harmonic generation (THG) is shown taking place in two different LBO crystals. 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