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Laser 101

What is MOPA Structure and Multistage Amplification technology?

MOPA (Master Oscillator Power Amplifier) Structure Description

In the realm of laser technology, the Master Oscillator Power Amplifier (MOPA) structure stands as a beacon of innovation, designed to deliver laser outputs of both high quality and power. This intricate system is composed of two pivotal components: the Master Oscillator and the Power Amplifier, each playing a unique and crucial role.

The Master Oscillator:

At the heart of the MOPA system lies the Master Oscillator, a component responsible for generating a laser with specific wavelength, coherence, and superior beam quality. While the output of the Master Oscillator is typically low in power, its stability and precision form the cornerstone of the entire system's performance.

The Power Amplifier:

The primary task of the Power Amplifier is to amplify the laser produced by the Master Oscillator. Through a series of amplification processes, it significantly enhances the overall power of the laser while striving to maintain the integrity of the original beam's characteristics, such as wavelength and coherence.


The system primarily consists of two parts: on the left, there is a seed laser source with high beam quality output, and on the right, there is a first-stage or multi-stage optical fiber amplifier structure. These two components together form a master oscillator power amplifier (MOPA) optical source.

Multistage Amplification in MOPA

To further elevate laser power and optimize beam quality, MOPA systems may incorporate multiple amplification stages. Each stage performs distinct amplification tasks, collectively achieving efficient energy transfer and optimized laser performance.

The Pre-amplifier:

In a multistage amplification system, the Pre-amplifier plays a pivotal role. It provides initial amplification to the output of the Master Oscillator, preparing the laser for subsequent, higher-level amplification stages.

The Intermediate Amplifier:

This stage further increases the laser's power. In complex MOPA systems, there may be multiple levels of Intermediate Amplifiers, each enhancing power while ensuring the quality of the laser beam.

The Final Amplifier:

As the concluding phase of amplification, the Final Amplifier elevates the laser's power to the desired level. Special attention is required at this stage to control beam quality and avoid the emergence of nonlinear effects.

Applications and Advantages of MOPA Structure

The MOPA structure, with its ability to provide high-power outputs while maintaining laser characteristics such as wavelength precision, beam quality, and pulse shape, finds applications in various fields. These include precision material processing, scientific research, medical technology, and fiber optic communications, to name a few. The application of multistage amplification technology allows MOPA systems to deliver high-power lasers with remarkable flexibility and outstanding performance.

MOPA Fiber Laser From Lumispot Tech

1064nm 高峰值雷达光源

In the LSP pulse fiber laser series, the 1064nm nanosecond pulse fiber laser utilizes an optimized MOPA (Master Oscillator Power Amplifier) structure with multi-stage amplification technology and modular design. It features low noise, excellent beam quality, high peak power, flexible parameter adjustment, and ease of integration. The product employs optimized power compensation technology, effectively suppressing rapid power decay in high-temperature and low-temperature environments, making it highly suitable for applications in TOF (Time-of-Flight)  detection fields.