Filter selection can be made manually from push buttons on the unit, or remotely from either a USB 2.0 or RS-232 interface.

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Green lasers are used for various applications, including laser pointers, laser projection displays, printing, interferometers, bio instrumentation, medical scanning, and pumping of solid-state lasers. They are created using a semiconductor diode laser, typically by doubling the frequency of an infrared laser using a nonlinear optical crystal. This process generates light with a wavelength of around 532 nanometers, which falls within the green region of the visible spectrum.

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The different wavelengths also mean that red and green lasers interact differently with various materials. For example, green light might be more easily absorbed or scattered by certain substances compared to red light.

So, feel free to jump ahead a section if you already understand what green lasers are but, if you’re like me, read on for a quick tutorial on this technology commonly used in astronomy, pointing devices, alignment tools in construction and manufacturing, and even in some medical procedures.

The technique of using green lasers can be applied in nuclear decommissioning, which helps to effectively cut structures without releasing any hazardous particles into the atmosphere. This technique is also useful in removing the melted residue more efficiently in underwater cutting applications without the need for auxiliary gases, which eliminates the requirement for complex piping. Additionally, since this process is non-contact, it eliminates the need for continuous blade replacement, which is often the case with sawing.

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LiDAR is an advanced remote sensing technique that uses pulsed laser light to measure distances and generate a three-dimensional analysis of the targeted area, writes AZO Optics. Green lasers are preferred in bathymetric LiDAR due to their advantages over traditional red or near-infrared lasers. The primary advantage of green lasers is their ability to penetrate water, which allows for measuring the depths of rivers, shallow water reservoirs, and coastal seawater up to three Secchi depths.

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However, there are significant differences between the two laser types, the most significant being their wavelength. Red lasers typically have longer wavelengths, around 620-750 nanometers, while green lasers have shorter wavelengths, typically around 495-570 nanometers. This difference in wavelength affects their visibility with green light, being closer to the middle of the visible spectrum, often more visible to the human eye than red light, which may appear dimmer at the same power level.

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Automation of filter sequences is available through the serial interface. A simple command language facilitates retrieving filter status and making filter selections. LabVIEW software is included, and consists of a stand-alone user interface as well as a drive which can be incorporated into your own software. The unit comes with the controller, filter housing, filter wheel, and a 5 VDC power supply, and threaded rings to hold the optics in place.

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These filter wheels are used for a host of applications, including color CCD photography, fluorescence microscopy, and photometry. Two 4" dia, wheels are available: one which accepts six 25mm filters, and one which accepts twelve 12.5mm filters.

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“Traditional laser metal cutting typically occurs in dry environments using infrared or other long-wave laser radiation, which requires auxiliary gases delivered coaxially to the beam via intricate piping systems to expel the molten metal produced,” writes Laser Systems Europe. “If such wavelengths are used underwater, however, the light is scattered in all directions, causing substantial power loss over short distances.”

Green lasers have gained popularity due to their visibility to the human eye. The human eye is more sensitive to green light compared to other colors, making green lasers appear brighter and more visible even at lower power levels compared to lasers of other colors. These lasers have various applications across different fields, including:

There I am, on a Zoom call with my colleague and all-around good guy Geoff Tecza, who asks me, “Have we written anything about green lasers? That could make for a pretty interesting article.” I knew about the Green Lantern, Green Hornet, and Green Arrow. Heck, I even knew about the Jolly Green Giant. But green lasers? Yeah, that was a new one.

While there are numerous ways in which green lasers can be deployed, let’s take a look at two specific use cases: LiDAR and underwater laser cutting which, according to Laser Systems Europe, is benefitting from an energy-efficient process that has been developed using kilowatt-level green lasers. The process can be used to safely decommission old nuclear power plant structures or cut the steel frames surrounding offshore wind turbines to increase their power output.

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Finally, according to MedCrave, green lasers are more damaging to the retina than red lasers. Green laser pointers operate at 490–575 nm, while red laser pointers operate at 635–750 nm. Consequently, safety regulations and guidelines might vary slightly between the two.

Historically, green lasers were more expensive and challenging to produce compared to red lasers. This was due to the complexity of creating a green wavelength from semiconductor materials. However, advancements in technology have reduced this gap, making green lasers more accessible.

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"Green lasers exhibit strong compatibility with commonly used silicon-based photodetectors due to their wavelength aligning with detector sensitivity," AZO Optics notes. "This synergy improves photon capture, enhancing signal quality, signal-to-noise ratio, and efficiency."

The use of green lasers in LiDAR systems has several advantages. The shorter wavelength of green lasers allows for more concentrated energy in each pulse, resulting in an extended detection range without compromising the accuracy of the data. This feature is particularly beneficial for applications that require long-range capabilities. Additionally, the heightened visibility of green lasers is noteworthy, as the human eye is more sensitive to green light. This sensitivity leads to better alignment, calibration, and efficiency in underwater LiDAR operations.

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Now, a process developed by Fraunhofer IWS researchers uses short-wavelength green lasers exceeding 1kW of power instead to penetrate water with minimal power loss. “The process requires comparatively little energy, and the power transmission is more efficient,” said project leader Dr Patrick Herwig, who heads the Laser Cutting Group at Fraunhofer IWS.

Green lasers are growing in popularity because the human eye is especially sensitive to green light, which appears almost 30 times brighter than the red color. Does that make them a better choice than red lasers? Maybe yes … maybe no.

There are two primary colors most people think of when discussing lasers: red and green. Both types of lasers, despite having different wavelengths, share several similarities:

While both types have various applications, the choice of laser color often depends on the specific requirements. Green lasers, due to their higher visibility, are commonly used in astronomy, pointing devices, and certain medical procedures where precise visibility is crucial. Red lasers are also used in similar applications but might be preferred in scenarios where lower cost or specific wavelength characteristics are more important than maximum visibility.