Application prospect of 1535nm microchip laser in the field of LIBS
Apr. 20, 2023

The 1535nm microchip laser is a eye-safe laser using Er:Glass as the working medium.This laser have been widely used and recognized in the field of small laser range finders.Recently,the use of this laser in LIBS (Laser-induced Breakdown Spectroscopy) handheld devices has begun to attract attention in the industry.This paper briefly analyzes the application prospect of 1535nm laser in LIBS by introducing some characteristics of 1535nm laser and comparisons with conventional 1064nm laser.

RealLight’s 1535nm 1mJ laser


1.The 1535nm laser mainly has the following characteristics:

Small size: taking the laser with 1mJ output as an example, the weight of the laser is less than 20g.

Compact power supply: the size can be controlled within 20X40mm, with low  working current, which is suitable for handheld devices.

Wide temperature operation without TEC: the working temperatures range from -40~65℃.

TEM00 beam with stable energy.

Eye-safe wavelength: safe to operate.


RealLight’s 1535nm 1mJ&1064nm laser product parameters


Handheld LIBS devices are used in harsh outdoor environments, which have strict requirements on the integration and volume of lasers.The characteristics of this microchip laser at 1535nm are just suitable for all application needs. The power consumption is extremely low because no TEC is required. And it is suitable for use in complex field environments.


2.Comparison of spectral excitation capabilities of 1535nm lasers

Energy density is strictly required in LIBS detection.With the excellent beam quality of M2 less than 1.3, the 1535nm microchip laser is easy to focus.For example, if a laser beam with a 7ns pulse width and a 1mJ pulse energy is focused to a focal spot with a diameter of 0.1mm, the peak power density can reach 1.8GW/cm2, which can fully meet the energy requirements of LIBS excitation.The figure below shows the spectral comparison between 1535nm and 1064nm laser in testing brass samples.From the spectrum comparison chart, there is no difference in the excitation spectrum between the 1535nm and 1064nm lasers.

Comparison of spectral excitation effects of RealLight’s 1064nm and 1535nm microchip lasers


3.The results of 1535nm microchip laser used in the detection of ore samples

In order to verify the application feasibility of 1535nm in the field of light metal, the 1535nm laser with the pulse energy of 1mJ was used to test the beryl samples at a repetition rate of 5Hz.The test spectrum is as follows:

The test results of beryl samples using RealLight’s 1535nm 1mJ microchip laser


To sum up, from the characteristics of the laser and the actual measurement results, we can see that the 1535nm microchip laser has broad application prospects in the field of LIBS handheld and field equipment, and can replace the traditional 1064nm laser in the field of light element testing.


Beijing RealLight Technology Co., Ltd. was established in 2010. It is a high technology enterprise specializing in research, development and manufacturing of diode lasers, microchip lasers, narrow linewidth lasers, high-power solid-state lasers, laser detection and application technologies.RealLight will provide support for users in the field of LIBS application.


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