Glossary of laser cutting terms - G. From Tesko Laser, providing laser cutting and metal fabricating services. Tesko Laser Division - photos
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Glossary of laser cutting terms - G



G-code is one of a number of computer code languages that are used to instruct CNC machining devices what motions they need to perform such as work coordinates, canned cycles, and multiple repetitive cycles. G-Code is the most popular programming language used for programming CNC machinery. See CNC and CNC Controlled.

View full G-Code List.

Gas Jet

Gas which is blown into the cut to clear away molten metals, or other materials in the cutting zone. In some cases, the gas jet can be chosen to react chemically with the workpiece to produce heat and accelerate the cutting speed.

Gas Jet Assist

An assisting coaxial gas, often oxygen, argon, or nitrogen, that may be used to achieve very high power levels needed for cutting certain metals.

Gas Laser

A type of laser in which the laser action takes place in a gas medium.

Gas Mix

CO2 lasers use a mixture of carbon dioxide, helium, and nitrogen. Most applications can be done using a standard, predetermined ratio of these gases. Some applications require pulses with high peak energy and rapid decay of the pulse tail. Increasing the volume of CO2 gives this result. Increasing the volume of nitrogen allows operation of a laser at lower than its normal minimum CW power level.

Gas Pressure

The pressure of the Assist Gas that is usually measured in pounds per square inch (psi). With oxygen, gas pressure can range from 15 to 50 psi. With inert gases, the gas pressure can range from 30 to 200 psi.


Most glasses are not laser cut. They have a high absorptivity to CO2 laser light and demonstrate cracking along the edge cut due to the rapid thermal cycle associated with laser cutting. However, a laser can effectively cut quartz and heat resistant glasses.


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