Back focusastrophotography

Yudi Optics customizes a variety of laser lenses for different laser systems, especially focusing lenses suitable for CO2 laser system. For example, ZnSe lenses are often used as focusing lenses due to their high transmittance and resistance to high-power lasers.

I'm using astronomik filters that are 1mm thick, and plate solving shows my fl as 1317, not as 1280 as it's calculated fl

ASI183MCback focus

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Ultrafast optics include mirrors, lenses, prisms, filters, crystals, gratings, windows, beam expanders, splitters and shapers.

Ultrafast laser optics need to deal with the challenges of ultrashort pulses, wide wavelength range, and very high peak power. Major issues include group velocity dispersion (GVD), which affects laser performance due to the difference in the propagation speed of different wavelength components of the pulse, resulting in pulse elongation.

Not at the same level of astro quality I know, but I'm struggling with a C8 (non-EdgeHD) with the Celestron 0.63x FR. There's no/little/confusing information about what back focus is required, and from which point on the reducer is it measured.

I try to have some of THESE thin spacers, or shims, in the set-up and start off with a 0.5mm in there so that if I need to shorten the BF to make stars correct I can take it out, or replace with a 0.3, or I can add spacers or go up to 1 mm until I get the stars perfect, usually being less than 0.3 mm out doesn't really make any noticeable distortion, to my eyes anyway.

Not at the same level of astro quality I know, but I'm struggling with a C8 (non-EdgeHD) with the Celestron 0.63x FR. There's no/little/confusing information about what back focus is required, and from which point on the reducer is it measured.

Laser windows mainly refer to laser protection windows, which are used to isolate the inside of the laser from the external environment, but allow the laser beam to pass freely, while protecting sensitive optical components or sensors from the external environment, especially from debris or dust damage. These windows need to have high transmittance and excellent transmission wavefront to ensure that the performance of the laser system is not affected. In addition, laser windows usually use laser damage-resistant materials and coatings to resist the effects of high-power lasers. They are widely used in scenes such as laser cutting head protection, optical observation windows, and laser protection windows.

Back focuschart

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How to checkback focus

Optical lenses and mirrors are the key core components of laser optical systems and have a great impact on laser systems. With the popularization of high-power fiber lasers, ultraviolet lasers, and picosecond and femtosecond lasers, the requirements for core optical components are getting higher and higher. In this article, we will introduce the types of optical components commonly used in various laser systems and their working principles.

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Beam splitters and beam expanders are used to change the radius of a collimated laser beam. These components are usually composed of a series of mirrors, prisms, lenses, and filters.

Yudi Optics customizes windows for different laser systems and provides a variety of substrates and film layer options. The main applicable wavelengths are: 266nm/ 355nm/ 532nm/ 633nm/ 1064nm.

With my xlt 8 inch I've altered the backfocus as my stars looked wrong, celestron say to measure to the threads of the reducer but the adapter doesn't thread fully on.. So I'm using this measurement to the flat of the reducer @106.67

The index of refraction of glass ranges from 1.4 to 1.6, depending on the type of material constituting the glass prism and the wavelength of light being used.

Although the forms and applications of laser optical components are diverse and difficult to generalize, they almost all must maintain high manufacturing precision to operate successfully.

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Angular accuracy is an important indicator in laser prisms. The angular accuracy of the prism determines the high accuracy of the beam deflection, so when choosing a prism, please pay attention to the angular accuracy indicator.

Ultrafast optics is designed for ultrafast lasers, which are suitable for lasers with ultrashort pulses (picosecond, femtosecond, attosecond). These lasers are widely used in micromechanical material processing, observation of fast physical processes (such as photosynthesis and molecular vibrations), medicine, microscopy, spectroscopy, communications, and defense due to their extremely high precision and short pulse duration.

Yudi Optics customizes laser reflectors with accurate wavelength positioning, high reflectivity, high optical power, high laser damage threshold, firm coating, good finish, low absorption, etc., which are used to guide and adjust the path of the laser beam. Commonly used substrates are mainly quartz glass, oxygen-free copper, single-crystal silicon, etc. YuDi provides many reflective coating options including protective aluminum film, enhanced aluminum film, protective silver film, protective gold film, or dielectric film.

I just use the recommended BF from the flattener manufacturer, which as you say 55mm seems to be a common measurement, then add 1/3 thickness of my filters that are after the flattener (so if I have a LP filter in the train but before the flattener that is not included.

Focal reducerback focus

I try to have some of THESE thin spacers, or shims, in the set-up and start off with a 0.5mm in there so that if I need to shorten the BF to make stars correct I can take it out, or replace with a 0.3, or I can add spacers or go up to 1 mm until I get the stars perfect, usually being less than 0.3 mm out doesn't really make any noticeable distortion, to my eyes anyway.

I just use the recommended BF from the flattener manufacturer, which as you say 55mm seems to be a common measurement, then add 1/3 thickness of my filters that are after the flattener (so if I have a LP filter in the train but before the flattener that is not included.

20211014 — Explanation: In case of concave mirror, the centre of curvature and focus lie in front of the surface of the mirror.

Reflectivity and surface shape are two important indicators of laser reflectors. The reflectivity of laser reflectors is usually greater than 99%, and the surface shape is usually less than λ/2. At the same time, high-energy laser reflectors also need to have good surface quality and a high laser damage threshold. When selecting laser reflectors, the substrate material, reflectivity, surface shape, surface quality, and the corresponding working environment are all factors that need to be considered.

The focal length of a lens is the distance between the lens and the focused image on the sensor. A fixed focal length lens provides a fixed angular FOV (AFOV).

Telescopeback focuscalculator

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Yudi Optics customizes prisms for different laser applications. The optional materials include N-BK7, UV fused quartz, N-SF11, calcium fluoride (CaF2), germanium (Ge), and zinc selenide (ZnSe). We also provide coating services, with a variety of anti-reflection and reflective films available.

Procedurally, if the back focus distance isn't known but the reduction factor is, am I safe to test at two or more different distances, platesolve to establish the achieved focal length at each distance, and calculate the back focus distance that gives the required reduced focal length? (in my case, 2032mm x 0.63 = 1280mm)

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Laser optical devices are of various types and materials. They are essential in all aspects of laser use. Given the wide scope of this topic, only some of the most important and widespread categories of laser optical components will be outlined below. They mainly include the types of laser lenses, prisms, mirrors, filters, windows, beam expanders, beam splitters, etc..

As a leading optical component manufacturer in China, Yudi Optics has advanced precision processing equipment and technology, including single-point diamond turning, ion beam polishing and magnetorheological polishing, holographic metrology technology, and various thin film coating processes. We can achieve the highest optical indicators in the industry, minimize wavefront distortion and reduce scattering, thereby serving the most advanced laser systems.

I have always wondered how you guys calculate or work out the right back focus distance in your setups. In the beginning of my astrophotography journey, i just wen't with the standard 55mm which seems to be a standard measurement for more or less every OEM corrector/reducer. In the later years, I have been more and more keen to use a excel spread sheet to roughly calculate the back focus necessary, and to see what kind of adapters I need to order. But the two last setups, the calculated distance and "real", measured distance can vary by almost 1mm. What is your experience  and practice when setting up a new camera train? I recorded and put a video together of how I did last time. /Daniel

Depending on the application scenario, the required lens type is also different, so we classify it into multiple types according to its function, namely:

Prisms can be used to manipulate, direct, and disperse light. However, lasers usually come in only one color. Therefore, laser prisms are usually designed to internally reflect laser beams from multiple surfaces to deflect light at specified angles, which can not only deflect light but also adjust the direction of the imaged image. Depending on the purpose, laser prisms come in a variety of forms, including right angle, dispersion, pentagonal, image rotation, reverse reflection, wedge, etc. Laser prisms are widely used, including in imaging, medical, environmental protection, automation equipment, and other fields.

55mmback focus

So for my setup that is 55.7 mm. Then I put my spacers together and connect them to the filter wheel, and rotator if using one, and actually measure the total length with digital verniers as accurately as I can and use that distance as the actual distance not what the filter wheel and spacer manufacturers say they are. Then tune the distance in with different spacers until it is as close to the required distance as I can get with my spacers I have.

With a commitment to excellence, YUDI stands as a premier precision optic manufacturer in China, offering unmatched expertise in tailor-made precision optic manufacturing and the construction of advanced optical systems.

In lasers, lenses have a wide range of functions and can be used to focus, collimate, and expand laser beams. Commonly used lenses include spherical, aspherical, plano-convex, cylindrical, etc. When multiple lenses are combined in a beam-shaping system, they can be used to control the laser beam to form spots, lines, rings, and other shapes of different sizes for tasks such as laser lighting, scanning, welding, cutting, and other types of material processing.

Laser mirrors ensure that the beam is correctly directed and has a tight surface quality to minimize light scattering. They are often used for beam steering or folding, interferometry, and building laser resonators. Laser mirrors are usually made of materials such as BK7, fused quartz, glass-ceramic (Zerodur), single-crystal silicon, silicon carbide (SiC), etc. To increase reflectivity, laser mirrors are often coated with metal reflective films such as aluminum, gold, or silver.

Procedurally, if the back focus distance isn't known but the reduction factor is, am I safe to test at two or more different distances, platesolve to establish the achieved focal length at each distance, and calculate the back focus distance that gives the required reduced focal length? (in my case, 2032mm x 0.63 = 1280mm)

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In laser systems, they are mainly used to selectively transmit light of specific wavelengths and block unwanted out-of-band radiation and ambient light. They improve signal quality and protection of optical components in laser systems by reducing noise and interference. By shielding interference such as background radiation, ambient light, and noise, filters can prevent damage to optical components due to power level or temperature changes.

Laser optics differ from normal optics primarily in their ability to handle the unique properties of laser light, such as high power, coherence, and specific wavelength ranges. Key distinctions include:

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Application areas: Filters are widely used in materials processing, spectroscopy, medicine and life sciences, optical communications, image processing, defense industry and astronomy to improve system performance and protect optical components.

SCTback focus

Laser crystals are the key active medium in lasers, amplifying light to produce a coherent beam through a process called stimulated emission. To ensure efficient amplification of the beam, these crystals need to be highly transparent and durable to withstand the thermal effects caused by high-power lasers. Typically, laser crystals are doped with rare earth or transition metal ions to adjust their properties, such as wavelength, power stability, and beam coherence. Common host crystals include garnets, vanadates, fluorides, sapphires, and chalcogenides, and the shape and doping density of each crystal affect the output characteristics of the laser.

So for my setup that is 55.7 mm. Then I put my spacers together and connect them to the filter wheel, and rotator if using one, and actually measure the total length with digital verniers as accurately as I can and use that distance as the actual distance not what the filter wheel and spacer manufacturers say they are. Then tune the distance in with different spacers until it is as close to the required distance as I can get with my spacers I have.

In addition to the laser source itself, optics are another key component of the entire laser system. Laser optics include all optical components and optical systems used within the laser. Since lasers are usually coherent, monochromatic light, often polarized, and sometimes very intense, optical components are used to focus, manipulate, and shape laser beams and tailor parameters for various applications. They are widely used in a variety of laser systems, from laser cutting, welding, and marking, to high-energy physics experiments in research institutions and various medical laser treatments.

Laser beam shapers are used to collimate beams, transform beam profiles, adjust beam shapes, etc., especially when Gaussian beams are converted into uniform flat-top spots. The shape of the spot can be circular, square, rectangular, linear, elliptical, etc. The size of the emitted spot can be from hundreds of millimeters to a few millimeters, which can be customized according to customer needs.

The type of coating depends on the wavelength range of the laser and the required reflectivity. For example, gold is usually used in the near-infrared to far-infrared range, and aluminum is effective in the visible and near-infrared range.

In addition to reflectivity, the durability of the laser mirror is also an important factor, so protective coatings are often superimposed on the laser mirror. For example, dielectric coatings provide higher reflection than metal coatings and are optimized for common laser wavelengths, while laser line mirror coatings can help prevent laser damage and ensure a long service life.

By shaping the uneven laser beam into a uniform spot, the beam shaper improves the efficiency and quality of laser processing, avoids local overheating or underheating, and ensures clear processing boundaries. By shaping the laser beam into various energy distributions for specific treatments and processes, it is used to improve the power utilization rate and laser processing effect of laser manufacturing and is widely used in laser processing fields that require high precision and uniform energy distribution.