1. Photobiomodulation (PBM) can produce photochemical effects via modulating living cells. This method is used for incoherent (light-emitting diode) or coherent (laser) light with wavelengths that range from 405 to 1,100 nm.

2. Automotive laser-beam fusion welding joins components at high welding speeds with low thermal distortion. The laser beam is a concentrated heat source, focused on the cavity between any two metal pieces to be joined. This process is often employed in the automotive industry in high-volume applications.

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In bone injuries, PBM reduces inflammation, will improve the biological effect of osteoblasts, promote bone regeneration, and accelerate the healing of bones. This method has a non-traumatic advantage.

One common application of cold mirrors is in fiber optics. Since optical fiber is damaged by UV and infrared light, a combination of cold and hot mirrors is often used to isolate visible light from UV and IR bandwidths. The mirrors are set up so that only the visible wavelengths are transmitted to the optical fiber, and UV and IR wavelengths are reflected away from the fiber.

By processing a LiDAR point cloud to bare-earth digital elevation models (DEMs), vegetation can be stripped away to reveal past landslides and steep slopes, at risk of failure, masked by forested canopies (Fig. 1). In dense forests, landslides—especially old landslides—might be invisible on aerial images; they are hard to detect from the ground.

Shanghai Optics is a custom optics manufacturer with over 55 years of optics manufacturing experience, and we take pride in each optical piece that leaves our factory. Our state of the art metrology equipment and careful quality control ensures that each mirror has extremely high visible reflectance and excellent infrared transmission. Our durable dielectric coatings can survive extreme heat and high humidity.  Our mirrors are manufactured from float glass, and our factory standard surface quality is 80-50 scratch dig.  The thickness of each piece is specified to within +/- 0.3 mm, and all other dimensions are guaranteed to be within 0.5mm of stated measures.

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1.Shown is a LiDAR point cloud (left) and bare-earth DEMs (right). The vegetation is stripped away to reveal past landslides and steep slopes. (Image from Reference 2)

1. Study on the Osteogenic Differentiation of human umbilical cord mesenchymal stem cells (hUCMSCs) in Silk Fibroin/Polycaprolactone Membrane Under the Intervention of Photobiomodulation, IEEE Journal of Selected Topics in Quantum Electronics, Vol. 29, No. 4, July/August 2022.

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3. In this Gaussian beam distribution, the “waist” of the beam is the location in which the irradiance is 1/e2—13.5% of its maximum value. (Image from Reference 7)

Laser beams are termed Gaussian when they have an irradiance profile that’s following an ideal Gaussian distribution (Fig. 3).

PBM, an external stimulus in this application, accelerates the production of biological factors, reduces inflammation, and enhances tissue healing and repair. It also has been found to promote efficient functioning in such areas such as diabetes, brain injury, spinal-cord injury, skin disease, dentistry, and more.

Texas Instruments (TI) probably has the widest array of laser-scanning solutions. One unique solution that stands out in its laser product line is digital light processing (DLP) technology in the form of digital micromirror devices (DMDs). Designers can construct their point cloud, which will be able to accelerate their machine-vision (MV) solutions with help of TI’s DLP software development kits (SDKs) (Fig. 2).

2. This image demonstrates the function and capability of Texas Instruments’ DLP development kits. (Image from Reference 3)

To compute laser power density (power/unit area or irradiance), we will need a value for the diameter of the beam coupled with the value of the fraction of total power transmitted within that diameter. Average power and power density can be easily calculated here or here.

3. Holography is made possible via a laser source in which a coherence length, greater than 1 m, is sufficient to write holograms. A beam of coherent light (from the laser) is split—half of the beam will fall on a recording medium (like a photographic plate) unaltered, and the other half first gets reflected off the object to be imaged. Together, these two beams will produce an interference pattern of stripes and spirals/concentric circles or “whorls” on the photographic plate. The developed plate is the hologram.

4. Lasers can accelerate some chemical reactions: Chemists typically can’t mix their reactants together until the very instant they’re ready for the reaction to proceed. A low-cost laser can be used to trigger and accelerate a chemical reaction for printing, or even to regulate drug delivery within the human body.

Laser power density can be determined by the laser power divided by its cross-section area or beam size. Power density is the power per unit area, aka irradiance, and is typically expressed in terms of W/cm2. Today, there are myriad applications that take advantage of the benefits of laser technology.

Cold mirrors are used for a wide range of applications that involve separating light by wavelength. Since the thin film coating on these mirrors transmits infrared away from the application while reflecting visible light at a designated angle, it is a highly effective beam splitter that can be used to remove problematic radiation from a system.

Alpha Industrial Park, Tu Thon Village, Ly Thuong Kiet Commune, Yen My District, Hung Yen Province Vietnam 17721 +84 221-730-8668 rfqvn@shanghai-optics.com

Room 609, 6/F, Global Gateway Tower, No.63 Wing Hong Street, Cheung Sha Wan, Kowloon, Hong Kong +852-54993705 info@shanghai-optics.com

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Cold Mirrors with a 3.3 nm thickness are available in stock.  We carry one inch and two inch diameter rounds. We also have in stock one inch, two inch and four inch square configurations. Larger sheets are also available and may be cut into custom sizes.

Experienced Editor-In-Chief of EETimes/Planet Analog and Senior Technical Editor at EDN running the Analog and Power Management Design Centers from 2012 to 2019.

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A cold mirror is a specialized longpass filter, an optical mirror which is designed to reflect shorter wavelengths of light at a 45° angle of incidence while transmitting undesired heat (infrared radiation). At Shanghai Optics we manufacture cold mirrors with high surface quality and superb optical qualities.  Our cold mirrors exhibit high reflectance over the entire visible range and excellent transmission in the infrared. Manufactured using special proprietary techniques and coated with a multi layer dielectric coatings, they are the most durable commercially available cold mirrors available today.

Our cold mirrors meet military standard Mil. C-675 and pass snap tape tests. They can withstand high thermal loads, and are capable of operation at temperatures as high as 600 degrees C. They will also operate and perform well in extreme humidity and abrasive environments.

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A demonstrated history in electronic circuit design and applications for 40 years, and nine years of technical writing and editing in industry. Skilled in Analog Electronics, Space-related Electronics, Audio, RF & Communications, Power Management, Electrical Engineering, and Integrated Circuits (IC).

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LiDAR (light detection and ranging) can measure the distance of an object (measuring the time for the reflected light beam to return to the receiver) using pulsed lasers. It also can create a 3D image of an object.

LiDAR point clouds2 are typically described by their unique technology of dynamic information storage. See the U.S. Geological Survey (USGS) point cloud references here.

Another application of cold mirrors is in lighting applications where IR heat is undesired. The mirror is set up to reflect visible light toward the object to be lit, while infrared radiation is transmitted away (often at a 45 degree angle).

The multi-layer dichroic coating on our cold mirrors reflects an average of greater 95% of light over the wavelength range 420-700nm, and greater than 20 percent over 800-2500nm.

6. Garment manufacturing industry: The garment industry uses lasers for cutting garment patterns, 3D body scanning, fading for denim, and leather engraving.

Strong media and communication professional with a BEEE from NYU Engineering in 1972 and an MSEE from Polytechnic University in 1989. Senior Lifetime member of IEEE. Former IEEE Long Island, NY Director of Educational Activities. Eta Kappa Nu EE honor society member since 1970.

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1972 to 1988 worked as a circuit design engineer in audio (8 years) and microwave (8 years). Then was Corporate Account Manager/applications engineer for Burr-Brown from 1988 to 2000 when TI purchased Burr-Brown. Worked for TI from 2000 to 2011.

Author of the non-fiction “Guardians of the Right Stuff,” a true story of the Apollo program as told by NASA and Grumman Corp. engineers, an astronaut, and technicians.

8. Medical: Companies such as Modulight have provided lasers in medical applications, such as cancer treatment, with genetics/drug discovery/diagnostics as well as for ophthalmology.

7. Security and defense: Laser technology is being applied in perimeter security, target designation, and monitoring of toxic gases. The military also uses lasers in directed energy weapons.

5. Distance calculation: Just like sonar, a laser beam can be employed in surveying and ranging/distance calculation with no need for physical contact. Laser measuring tools function by transmitting a light beam to the target, which will then reflect off the surface and reflect back to the sending device. Lasers can measure distance with a great deal of accuracy.