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Ours is an organisation dedicated for the design, development and manufacture of optics, opto-mechanics, educational products and positioning devices.

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There is an “unfocused” method of engraving applied to create larger lettering on bulky materials, for example, 3" x 6" letters on a 3' x 4' piece of plywood. You can "unfocus" the laser spot and enlarge it to around 1mm-1.5mm. Always expect some trial and error when trying out a new engraving technique.

This factor determines how sharp the engraving comes out when it's done. Here is where the thickness of material and resolution intersects: Larger laser focusing lenses have lower resolutions, and remember that for thick materials, you need a large lens. This implies that you must be able to strike a balance between these two factors. In the end, you want a lens that can work on thick materials and still give good details and a fine resolution. Generally, the 2-inch lens (focus) is considered as the most universal among the classes of lenses available - 1.5, 2, 2.5, and 3-inch, respectively.

B.7., H.M.T. Industrial Estate H.M.T. P.O, Kalamassery, Kochi Kerala, India - 683 503    +91 938-863-2098    sales@holmarc.com    Mon - Sat : 9 am to 5 pm

In CCD based Raman spectrometer, sample is kept in cuvette accompanied by the mechanical chamber with DPSS laser (532nm). The vibrational state of molecule while relaxing the high energy state re-emits the radiation in all directions. Spectrometer is positioned in such a way that laser beam collide at the cuvette perpendicularly. Notch filter is used in front of the spectrometer to avoid Rayleigh scattering so that Raman radiations are measured efficiently.

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It is based on the inelastic scattering of incident radiation through its interaction with vibrating molecules. It probes the molecular vibrations. This will produce a different range of frequencies, namely intense stokes and anti stokes, which have higher frequency than the incident radiation along Rayleigh line. Rayleigh and Raman scattering can be explained both classically and quantum mechanically.

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Taxes: We collect general sales tax on shipments, unless the purchaser supplies us a signed official sales tax exemption certificate with the order. Purchase made outside our region are subject to state or local sales/ use tax, if any and other taxes payable by reason of this transaction.

Trying to focus a laser engraver can be a tough task. It’s not always easy to learn how to focus your laser engraver machine. As a business owner, learning the fundamentals of your laser focusing lens will help you maximize profit and deliver quality work. One of the most important factors to look out for when using a laser engraver is the focal length.

Focal length is the distance from the focal lens to the laser beam’s convergence point. When a laser beam is emitted from a CO2 laser tube, the laser beam has inconsistent intensity and is too wide to engrave with any precision. That’s where the focal lens comes in — laser focusing lenses have a convex contour that makes the laser beam converge to an extremely narrow point, bending the laser beam into an X shape. This point of convergence, or center of the “X,” is precisely where the laser should contact the target material.

We try improving the quality of our products for every consignment we dispatch. Our customers can expect to receive better products each time a purchase order is placed with us.

Focal length refers to the distance from the laser focusing lens to the top surface of the material being processed, which is often measured in inches. On the other hand, focus refers to the smallest possible beam of a laser. And this beam has the maximum density of laser packed in it. Focus is an inherent property of focal length; it’s basically the focal length at which the best engraving quality is realized. For example, when an engraver is designated to have a focal length of 1.5 inches, this implies that when you place a material 1.5 inches from the focal lens to the top surface of your material, only at that distance to the material is the engraving sharpest. Therefore, you must note the lens's designated focal length when purchasing your laser engraver.

The takeaway is that you must consider the thickness of the material you will be working with when purchasing an engraver. Knowing fully well that your laser engraver must not underperform, neither should it overperform to save cost. Failure to do this could limit your profit and capacity as a business entity in the laser engraving space.

Typically, all materials vary in their composition, and this should inform the right lens choice for you. Different materials have varying absorptivity for laser engraving via the focal length of the lens. For example, the appearance of engraving on glass and wood differs even at the same lens focus. This means that you have to pay keen attention to how each material responds to the engraver's focus.

Product warranty: Our warranty for all our mechanical components and systems are ONE year from the date of shipment. Repair or replacement will be made free of charge for products with defects in material and workmanship during this period. For our optical components, our warranty is 30 days from the date of shipment. Defective items will be replaced free of cost. The customer must notify any defect in optical components within 48 hours of receipt. For all warranty replacement, a written statement with an authorized signature indicating the reason for rejection attaching test reports are requested to accompany the returned parts. All defective items must be returned in their original shipping container within 10 days of the date of shipment.

Highly sensitive (0.1 -6500ms), low noise, cooled CCD is ideal as a detector for Raman spectrum studies. Czerny Turner design is applied in the spectrometer with precision holographic grating as dispersion element. The control electronic devices convert the optical dispersion to electronic pulses which is transmitted to computer via USB.

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The software used to interpret the data is user friendly. Regression / curve fit algorithms ( Newton - Raphson numerical analysis, Levenberg Marquardt algorithms, etc ) are used. Savitzky – Golay filtering / Box car smoothing purposes, etc are the features of the software. Material library is provided for customized versions.

The rule of thumb guiding laser focusing states that the larger or thicker material, the larger the lens, spot size, and depth of focus. Consequently, it is evident that a thin material will require a small spot size and a small lens. Also, the lens will only be able to engrave small and fine details on the material. For fine detail and efficient cutting, the proper focused laser spot will be between .1 - .3 mm.  This analysis is the opposite if you have thick materials.

The focal lens can affect the machine's power by changing the laser beam's dot size diameter. A 60W machine can only provide 60W of maximum power, no matter which focus lens is used. But, larger lenses will typically increase the beam dot size, which lowers the energy density of laser beam. That means that using a typical 4-inch focal lens with a 50W laser tube will actually decrease your cutting ability because the laser beam is wider and less dense. Keep this in mind when choosing your focal lens for laser cutting. While a 3 or 4-inch lens is great for cutting on a High-Power laser, it's not ideal for a Mid-Range laser.

Specifications: HOLMARC reserves the right to modify, change or otherwise improve all items in the catalog specifications without prior notice.

Focal length is embedded in the concept of laser focusing. It determines the quality of your laser markings for a perfect engraving. You can liken this concept to how you have to adjust a camera's focus to get a clear image.

Purchase Orders: Written, faxed and e-mail purchase orders are accepted. All orders require immediate written confirmation.

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Knowing the right focus lens for you is not rocket science. The truth is these factors are interwoven and intertwined in some ways. When determining laser focal length, think about the maximum cutting thickness you want to achieve. These are some factors to consider when trying to choose the best focal lens for your laser engraving machine.

Our core competency is in prototype development and low volume production of opto-mechanical devices and systems where skilled labour is the major input. Our location in INDIA enables us to be the most cost effective in this field of activity compared to any other company in the world.

Shipping & Delivery: The shipping costs, Custom Duty and any (if) landing taxes etc will be extra. The date of delivery is only an estimate and we will have no liability for late or partial deliveries. we may refuse any order for any reason. Catalog items are normally shipped immediately from inventory. In the event that the items is out of stock, an estimated delivery date is given at the time of order. Most items can be shipped within 45 days.

We have in-house infrastructure capabilities for all the processes involved in the manufacture of our products. This helps us to have total control of quality in our products and services.

Get in Touch     B.7., H.M.T. Industrial Estate H.M.T. P.O, Kalamassery, Kochi Kerala, India - 683 503    +91 938-863-2098    sales@holmarc.com    Mon - Sat : 9 am to 5 pm

Holmarc's CCD Based Laser Raman Spectrometer apparatus (Model No: HO-ED-S-06A) is an apparatus designed for recording Raman spectra of both solids and liquid samples. Raman spectroscopy is a scattering technique. It is based on Raman Effect, i.e., frequency of a small fraction of scattered radiation is different from frequency of monochromatic incident radiation.

However, you must have the proper focal distance designed for your specific application, and it must be set up in perfect focus to maximize the laser tube’s full wattage power. While you may think that the thicker the material, the larger the lens needed, the more likely the resolution and detailing is lower, and the more power is required. But this relationship isn’t always true. The main factor of power depends on the focal length of the lens. You can have an 18mm diameter focal lens with a focusing distance of 3". You can also have a 25mm diameter focal lens with a 1.5" focusing distance. The trick is in manipulating your focal length to achieve your desired laser power relative to the size and thickness of your project materials.

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The products described in this website constitute only the standard items we manufacture for research and industrial market. One of our major activity is in OEM market where we develop and supply low volume opto-mechanical devices & positioning as per custom design. We also undertake contract manufacturing of opto-mechanical products in standard and custom specifications.

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Payment: 100% Advance payment prior to dispatch. Customers paying by international wire transfer must prepay all bank charges including all charges imposed by correspondent or intermediary banks.

We have done our best to highlight laser focusing and its relation to some factors considered above. More so, these lenses and their focal length always determine the quality of the laser beam available for engraving. In general, ensure you do your homework and define your expectations before purchasing a laser engraver. OMTech has the best CO2 and fiber laser machines with the appropriate accessories for optimal result and marking quality. Our doors are wide open to receive you for demonstration and consultancy at our Southern California showroom.

Established in 1993, Holmarc Opto-Mechatronics Ltd manufactures variety of scientific and engineering instruments for research, industry and education.