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telephoto是什么

Objectives are lens element combinations used to image (usually) distant objects. To classify the objective, separated groups of lens elements are modeled as thin lenses. The simple objective is represented by a positive thin lens.

Sacher Lasertechnik offers quantum cascade lasers with emission between 4 μm and 12 μm, suitable for applications like molecular spectroscopy.

Fisheyelens

7 days ago — The meaning of LASER BEAM is the narrow beam of light produced by a laser.

The telephoto objective produces a system focal length longer than the overall system length (t + BFD). It consists of a positive group followed by a negative group.

Telephotolens

Alpes Lasers designs and manufactures a wide range of QCLs with wavelengths from 4 to 14 μm and powers up to hundreds of milliwatts. This includes FP, DFB, THz, frequency comb and external cavity lasers in the mid-IR. Additionally, Alpes offers uniquely fast and widely tuneable lasers with our ET and XT product line.

Focal length

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Mar 7, 2019 — The retarder also enables a higher downhill speed, and therefore a higher average speed. Finally, braking performance is independent from the ...

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The reverse telephoto objective or retrofocus objective consists of a negative group followed by a positive group. This configuration is used to produce a system with a BFD larger than the system focal length. While this configuration is used for many wide angle objectives, the term reverse telephoto specifically refers to the configuration, not the FOV.A collimator is a reversed objective. It creates a collimated beam from a source at the system front focal point, and the image of the source is projected to infinity. The degree of collimation is determined by the source size.

telephoto lens中文

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A 20x objective with a field number of 18 would actually have a FOV of 0.9 mm. Likewise, a 100x objective with a field number of 18 would have a FOV of 0.18 mm.

Opticallens

Alpes Lasers designs and manufactures a wide range of QCLs with wavelengths from 4 to 14 μm and powers up to hundreds of milliwatts. This includes FP, DFB, THz, frequency comb and external cavity lasers in the mid-IR. Additionally, Alpes offers uniquely fast and widely tuneable lasers with our ET and XT product line.

Frankfurt Laser Company offers quantum cascade laser diodes with emission wavelengths from 4 μm to 13 μm with either DFB or Fabry–Pérot type.

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Introducing the Shaft Hog, the first shaft alignment tool priced under $4,300 USD, bringing precision laser alignment to every facility with rotating equipment.

Serving North America, RPMC Lasers offers a range of high-performance quantum cascade lasers. The PowerMir line emits in the main transmission bands of the atmosphere (4.0 µm, 4.6 µm, 4.8 µm, 9.x µm). Furthermore, the new line of UniMir Distributed Feedback (DFB) QCLs emit in the LWIR spectral region (11.3, 13.4 & 14 µm). The PowerMir line are Fabry–Pérot laser sources operating in the quasi CW regime. In other words, pulsed operation down to few tens of nanoseconds and high frequency above MHz at room temperature. The UniMir line are DFB sources with CW operation. These products exhibit high average power and wall-plug efficiency. Therefore, perfect for counter-measure and other defense applications, as well as gas detection in the nuclear and petrochemical industries.

The Petzval objective consists of two separated positive groups of elements. The system rear principal plane is located between the groups.

Widelens

Quantum cascade lasers are semiconductor-based lasers emitting in the mid-infrared or terahertz regions. They are widely used for infrared absorption spectroscopy of trace gases, among other applications.

by D Renker · 2006 · Cited by 686 — Avalanche photodiodes (APDs) have internal gain which improves the signal to noise ratio but still some 20 photons are needed for a detectable light pulse. The ...

32 suppliers for quantum cascade lasers (QCL) are listed in the RP Photonics Buyer's Guide, out of which 5 present their product descriptions. Both manufacturers and distributors can be registered.

Primelens

Sacher Lasertechnik offers quantum cascade lasers with emission between 4 μm and 12 μm, suitable for applications like molecular spectroscopy.

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Serving North America, RPMC Lasers offers a range of high-performance quantum cascade lasers. The PowerMir line emits in the main transmission bands of the atmosphere (4.0 µm, 4.6 µm, 4.8 µm, 9.x µm). Furthermore, the new line of UniMir Distributed Feedback (DFB) QCLs emit in the LWIR spectral region (11.3, 13.4 & 14 µm). The PowerMir line are Fabry–Pérot laser sources operating in the quasi CW regime. In other words, pulsed operation down to few tens of nanoseconds and high frequency above MHz at room temperature. The UniMir line are DFB sources with CW operation. These products exhibit high average power and wall-plug efficiency. Therefore, perfect for counter-measure and other defense applications, as well as gas detection in the nuclear and petrochemical industries.

We have decades of experience in development and manufacturing of specialty optical fibers. We offer guidance when it comes to finding the right product for ...

Frankfurt Laser Company offers quantum cascade laser diodes with emission wavelengths from 4 μm to 13 μm with either DFB or Fabry–Pérot type.

10x magnification mirrors are perfect for getting up close and personal with your pores and seeing all the details lesser mirrors might miss.

LumiLoupe Ultra 5x Power 2.5" LED Lighted Stand Loupe Magnifier with 3 Brightness Settings. Item #: LL88. More Info.

Advantage Light Source CAST BRASS is the sign of long life and durability. Most of our Landscape Lighting and. VERSA-LED housings are constructed using the ...