Avantier’s unwavering dedication to innovation culminates in their germanium-fueled MWIR lenses. Meticulously crafted, these lenses approach diffraction-limited quality within the MWIR spectral range. Their applications span a diverse spectrum, encompassing Fourier-transform infrared (FTIR) spectroscopy, tunable Quantum Cascade Laser (QCL) operations, and thermal imaging technologies.

Ophir SWIRlens

The brightness and resolution of an image formed by an objective at a given magnification increases with its NA value, respectively the diameter of the angular aperture (the angle of the light cone collected by the objective). Light rays emanating from the specimen pass through air (or a liquid-based immersion medium) located between the cover glass and the objective’s front lens. The angular aperture is expressed as the angle between the microscope’s optical axis and the direction of the most oblique light rays captured by the objective (see the tutorial figure). Mathematically, the NA is expressed as:

The light gathering ability of a microscope objective is quantitatively expressed in terms of the numerical aperture (NA). The objective’s NA is a measure of its ability to capture image-forming light rays: Higher NA values allow increasingly oblique rays (representing finer object structures) to enter the front lens of the objective, producing a higher-resolution image with greater specimen detail. This interactive tutorial demonstrates the change in numerical aperture light cones displayed by a microscope objective with corresponding changes in numerical aperture. The angular aperture value corresponding to a given NA-value is also depicted here.

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Infrared lenses

Germanium’s impact also extends to medical diagnostics, where MWIR lenses emerge as a non-invasive, dependable tool for discerning subtle temperature fluctuations at the cellular level. Avantier’s germanium lenses empower medical practitioners to identify anomalies linked to conditions such as breast cancer, brain tumors, diabetes, and burn trauma. By capturing and decoding thermal signatures, these lenses provide insights concealed from traditional diagnostic methodologies, ushering in a new epoch of early detection and proactive treatment.

Germanium, known for its exceptional optical traits, occupies a central role in the design of MWIR lenses. Spanning a spectral range from 3000 to 5000 nanometers (3µm to 5µm), MWIR lenses possess the distinct ability to capture thermal radiation emitted by objects, revealing intricate temperature variances and concealed details. Avantierharnesses germanium’s distinctive properties to fabricate MWIR lenses that excel across a spectrum of applications. Whether off-the-shelf or custom-designed, ourr skilled engineers guide customers through optical design complexities, utilizing substrates like silicon, germanium, Chalcogenide, zinc selenide, and zinc sulfide, enhanced with various coatings.

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Ophirlens

n is the refractive index of the media in the object space (between the cover glass and the objective’s front lens) and θ is half the full angular aperture. The value of n varies between 1.0 for air and 1.58 for most immersion media used in optical microscopy. The angular aperture, which varies with the objective focal length, is the maximum angle of image-forming light rays diffracted by the specimen that the front lens of the objective can capture when the specimen is in focus. As the objective focal length decreases, the maximum angle between the specimen and the outer diameter of the objective front lens increases, causing a proportional increase in the angular aperture. From the above equation, it is obvious that the NA increases with both the angular aperture and the refractive index of the imaging medium.

Ophir ZoomLens

Theoretically, the maximum angular aperture achievable with a dry (air) microscope objective would be 180 degrees, resulting in a value of 90 degrees for the half angle used in the NA equation. The sine of 90 degrees is one, indicating that the numerical aperture is limited not only by the angular aperture but also by the refractive index of the imaging medium. Most microscope objectives are designed to operate with air (refractive index= 1.0) as the imaging medium between the cover glass and the front lens of the objective. This yields a theoretical maximum NA of 1.00. For practical reasons (available working distance), the highest desirable value for the NA of a dry objective is 0.95 (the half angle of the aperture is approximately 72 degrees). Immersion objectives achieve much higher NAs at the expense of free working distance and spherical aberration sensitivity.

Our MWIR solutions encompass a range of substrate possibilities tailored to the MWIR region, including silicon, germanium, Chalcogenide, zinc selenide, and zinc sulfide. Complementing this array of substrates, we offer a rich selection of anti-reflective and durability coatings. This versatility extends to the production of high-quality zoom lenses, aspheric lenses, spherical lenses, and objective lenses. With a variety of lens mounts at your disposal, rest assured that your final lens integration will seamlessly harmonize within your assembly, performing precisely as envisioned.

Thermal cameralens

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In the security and surveillance industries, germanium-infused MWIR lenses empower systems to pierce through obscurants like smoke, fog, and darkness, unfurling concealed threats with exceptional clarity. This breakthrough significantly bolsters situational awareness, a critical asset in defense and security undertakings. Furthermore, these lenses expedite early detection of gas leaks, preempting potential disasters by pinpointing hazardous leaks before escalation.

Are you curious about how microscope objectives capture finer object structures to produce higher-resolution images? This foundational knowledge article on Numerical Aperture and Light Cone Geometry will give you a sound understanding of the light gathering ability of microscope objectives and how it is expressed through the numerical aperture (NA). An interactive tutorial allows you to visualize changes in the illumination cone as you vary NA values. You will also learn about the role of the refractive index and the limitations of the maximum achievable NA values.

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The tutorial displays a schematic drawing of a microscope objective. The actual angular aperture of the light cone and the corresponding NA value are indicated in the tutorial window. To operate the tutorial, use the Numerical Aperture slider to change the NA value from low (left) to high (right). As you vary the numerical aperture value with the slider, the size and shape of the illumination cone entering the objective’s front lens is altered. The adjustable NA for this tutorial is 0.03 to 0.95. The approximate objective magnification has also been assigned to each NA value.

Should our offerings not precisely match your requirements, our team of expert engineers stand ready to collaborate on tailored MWIR components, perfectly aligned with your application needs. Crafting an optical design requires a strategic selection of substrates, coatings, and physical lens configurations. Our opto-mechanical engineers skillfully navigate this intricate process, equipping you with the insights necessary for informed decision-making.

Within our ready-to-order selection, our MWIR lenses offer focal lengths ranging from 25 to 250, accommodating a field angle spanning 7 to 27.6 degrees. These readily available options feature manual focus mechanisms, with a versatile range of interfaces, including C-mount, M50x1, M60x1/Flangle, M36x1, and M32x1. All our MWIR lenses are impeccably engineered to seamlessly integrate with a 640×512-15um detector, ensuring optimal performance.

Each lens endures stringent quality control, encompassing scrupulous scrutiny of surface quality, image distortion, aberrations, and astigmatism. Avantier’s advanced Modulation Transfer Function (MTF) Testing rigorously appraises optical parameters, yielding consistently superior performance. The company’s ISO 9001 certification underscores their unwavering dedication to surpassing industry standards.

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OphirMWIRlenses

The usual method is dividing the effective focal length of the optical tube assembly by the focal length of the eyepiece. In a simple refractor ...

LWIR cameralens

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Among the various options for optical materials, germanium emerges as a cornerstone in the creation of Medium-Wave Infrared (MWIR) Lenses. Avantier utilizes germanium’s unique properties to pioneer new dimensions in MWIR imaging. This article delves into the pivotal role germanium plays in Avantier’s MWIR lenses, unveiling its exceptional attributes, diverse applications, and its profound contribution to advancing infrared technology.

SWIRlens

As Avantier pioneers germanium’s fusion with MWIR lens technology, the horizons of imaging and sensing widen. Germanium’s optical mastery, entwined with Avantier’s precision engineering, paves the path for enhanced industrial processes, advanced security solutions, and revolutionary medical diagnostics. In a realm centered on the future of MWIR optics, Avantier’s germanium-based lenses stand as beacons of progress, illuminating a future where the hidden emerges, and the unseen is unmasked. Reach out to Avantier today to embark on a transformative journey reshaping the realm of MWIR imaging through the fusion of germanium’s brilliance and pioneering optical ingenuity.

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The applications of MWIR lenses extend across diverse industries, resonating particularly with those dependent on precise thermal imaging. Avantier’s MWIR lenses flourish in industrial environments, pivotal for quality control and predictive maintenance. These lenses empower experts to discern anomalies within thermal patterns, assuring compliance with rigorous standards and forestalling costly equipment malfunctions.