The core difference between MOPA lasers and ordinary Q-switched fiber laser marking machines lies in the tunability of pulse parameters, working principle, and application scenarios: MOPA achieves independent tunability of pulse width and frequency (2ns–500ns) through electrical modulation, suitable for fine processing; while Q-switching technology uses acousto-optic modulation to fix the pulse width (80ns–140ns), suitable for rough processing such as deep metal engraving.

Differences in Working Principles:

MOPA Laser: Employs Master Oscillator Power Amplifier technology, where an electrical signal drives a semiconductor laser chip to generate seed light, which is then amplified by fiber optics, achieving flexible control of pulse parameters.

Q-switched Fiber Laser: Generates pulses by periodically adjusting the resonant cavity loss through an acousto-optic modulator (AOM), with a simple structure but fixed parameters.

Technical Parameter Comparison:

1. Pulse Width:

· MOPA: Arbitrarily tunable from 2ns–500ns, small heat-affected zone.

· Q-switched: Fixed 80ns–140ns, cannot be adjusted. 

2. Repetition Rate:

· MOPA: Up to MHz level (e.g., 4000kHz), high efficiency.

· Q-switching: Upper limit approximately 100kHz, narrow adjustment range.

3. Peak Power: 

· Both can reach the kilowatt level, but MOPA maintains a stable high peak power through parameter combinations.

Application Scenarios Differences

1. MOPA Applicable Scenarios:

 · Fine processing: Blackening of alumina, color marking on stainless steel (e.g., mobile phone casings).

 · Sensitive materials: Electronic components, medical devices (minimal thermal damage).

 2. Q-switching Applicable Scenarios:

 · Rough processing: Deep engraving of metals (e.g., stainless steel cutting), marking on high-reflectivity materials (gold/copper).

Technical Data