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Thorlabs, a global leader in photonics solutions, has published a collection of technical white papers that are now available on GoPhotonics, the premier online platform for photonics news and resources. These white papers delve into a wide range of topics including advanced optical systems, fiber optic technologies, spectroscopy, motion control, and laser-based applications. By sharing this knowledge, Thorlabs underscores its commitment to advancing both fundamental research and industrial innovation in the photonics sector.

The newly featured publications provide researchers, engineers, and industry professionals with valuable technical insights, offering practical guidance for integrating photonics technologies into real-world applications. With GoPhotonics serving as the central hub for accessing these resources, the collaboration ensures that Thorlabs’ expertise reaches a global audience eager to stay at the forefront of optical science and engineering.

The following whitepapers are part of this release:

Textured Antireflective Surfaces for High-Power Applications

This whitepaper details an innovative alternative to conventional AR coatings. By etching nanostructured conical textures directly into UV fused silica (TU or T1 substrates) or Infrasil^® (T2 substrates), the resultant optical windows deliver ultra-low reflectance (<0.25 % average per surface) and high absolute transmission (≥ 98 %) across broad spectral ranges (230 - 450 nm, 400 - 1100 nm, or 1000 - 1700 nm, depending on the surface type). Crucially, these textured surfaces offer significantly enhanced laser damage thresholds, greater than 30 J/cm² under standard test conditions - making them ideal for high-power laser applications that demand both durability and minimal Fresnel reflections.

Click here to download the Whitepaper.

Multiphoton Imaging with Gradient Index (GRIN) Lenses

This paper highlights the advantages of GRIN optics in advanced biomedical imaging. Unlike conventional lenses, GRIN lenses exhibit a continuous radial change in refractive index, enabling them to reproduce the imaging characteristics of singlet lenses within a compact form factor. The paper explains how these unique properties allow GRIN lenses to efficiently relay light from one focal plane to another, a capability that makes them particularly valuable in multiphoton microscopy for imaging deep into scattering biological tissues. By reducing the need for invasive tissue removal and providing access to otherwise inaccessible regions, GRIN lenses open new possibilities for high-resolution, minimally invasive imaging in neuroscience and other life science research fields.

Click here to download the Whitepaper.

Risley Prism Scanner

This whitepaper delves into the design, operation, and performance nuances of a dual-wedge prism beam-steering system. The paper outlines how two counter-rotating round wedged prisms can deflect a beam from its optical axis to produce continuous circular scan patterns or precise discrete pointing, based on Snell’s Law and small-angle approximations. It covers the analytical basis for beam deviation, highlights how varying rotation speed ratios generate complex epitrochoid patterns (such as rose curves, limaçons, and trifoliums), and details practical implementation using Thorlabs components - including alignment strategies, error sources like center defects and misalignments, and both continuous and raster scan capabilities (even custom patterns like heart shapes) - all validated through experimental tests and supported by equations and LabVIEW-controlled assembly.

Click here to download the Whitepaper.

Compact ultra-bright supercontinuum light source

This whitepaper showcases a compact, cost-effective design that leverages a specially engineered photonic crystal fiber (PCF) and a passively Q-switched Nd microchip laser to produce a high-brightness supercontinuum spanning 550 - 1600 nm with outstanding spectral flatness (< 5 dB across the range). The whitepaper highlights how this SC source surpasses conventional broadband emitters - such as SLEDs, ASE sources, and incandescent lamps - in spectral flatness and single-mode brightness, while delivering pulsed output (0.5 - 1 ns pulses at 6 kHz repetition) with peak power in the kilowatt range. Its versatility makes it ideal for applications including fiber- or device-attenuation testing, low-coherence interferometry, OCT, and rapid spectroscopy, all within a truly compact form factor.

Click here to download the Whitepaper.

NEP - Noise Equivalent Power

explores the concept of NEP as a key metric for photodetector sensitivity. Authored by experts at Thorlabs, the paper defines NEP as the minimum input optical power required to achieve a signal-to-noise ratio of one in a 1 Hz output bandwidth - expressed in watts per square root hertz (W/√Hz). It breaks down how both shot noise (originating from dark current) and thermal (Johnson) noise (linked to the shunt resistance) affect NEP, explains the relationship between electrical and optical NEP, and emphasizes that Thorlabs specifies NEP assuming ideal optical coupling, treating optical and electrical NEP. It also demonstrates how NEP varies with wavelength-dependent responsivity and includes practical examples, such as calculating minimum detectable power and measurement methods that guide users in accurately assessing detector performance.

Click here to download the Whitepaper.

By making these technical white papers available on GoPhotonics, Thorlabs continues to strengthen its position as a global leader in photonics while providing the community with practical, application-focused knowledge. Covering topics that span advanced materials, imaging techniques, beam steering, light sources, and detector performance, these resources offer researchers, engineers, and industry professionals valuable insights that bridge theory and real-world implementation. This initiative not only underscores Thorlabs’ commitment to innovation but also ensures that its expertise is accessible to a broad audience driving progress in optics and photonics.