Master Oscillator Power Amplifier Laser System

Master Oscillator Power Amplifier Laser System

The MOPA microlasers from STANDA offer a robust solution for applications requiring high beam quality, sub-nanosecond (~200ps) laser pulses with energies ranging between 300-500uJ. These applications include high precision ranging and imaging, LIDAR, micro-materials processing, and UV spectroscopy in chemistry and biochemistry. The Master Oscillator Power Amplifier (MOPA) platform combines STANDA’s esteemed microlaser oscillators with a newly developed efficient amplifying stage, ensuring that the unique spatial and temporal characteristics of the microlasers are maintained while scaling the output power to multiwatt levels. Both Master Oscillators and Power Amplifiers are produced in-house at Standa facilities.

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The MOPA series continues the legacy of STA-01 microlasers, known for being the smallest passively Q-switched DPSS laser available without sacrificing optical performance. The system's design is compact for user convenience, fitting seamlessly into tight laboratory setups, measuring devices, or other equipment. The integration is further simplified by fiber-coupled pump diodes housed within the electronic controller, reducing the thermal load and footprint of the laser head. The pump radiation is delivered through 2m long metal-shielded fiber optic cables, allowing for easy incorporation into the user’s equipment. High pump and output powers necessitate optimized air or water cooling for the laser head.

Maintaining compactness and high beam quality, the STA-01-MOPA-TH and STA‑01‑MOPA series lasers can incorporate second and third harmonic generation crystals for nonlinear frequency conversion, offering green and UV lasers with wavelengths of 532 nm and 355 nm respectively.

The MOPA configuration provides flexibility for various output parameter modifications. If you require laser specifications beyond the standard units listed, please contact us or your local Standa representative.

• Marking
• Electronics (PCB Processing)
• Biomedical
• Instrumentation
• LIDAR and Laser Ranging
• Sensing and Monitoring
• Micro dissection
• Semiconductor Inspection
• Material processing
• MALDI-TOF
• TiSa, OPO pumping
• Laser Induced Fluorescence (LIF)
• Spectroscopy (LIBS, LIPS and PIV)
• Micromachining
• Nonlinear Optics (Harmonics and Supercontinuum Generation)
• Diamond drilling (SiC) and other hard materials

Models

Note: The specifications are subject to change without prior notice. Pulse duration of each model is preset at the factory. Contact Standa for more information.

Master Oscillator Power Amplifier Pulsed Laser

MOPA (Master Oscillator Power Amplifier)

The master oscillator generates a highly coherent beam, and the optical amplifier boosts the beam’s power while retaining its core properties. The master oscillator does not need high power or efficiency since these characteristics are primarily defined by the power amplifier.

MOPA systems offer advantages in achieving high performance, such as linewidth, wavelength tuning range, beam quality, or pulse duration, by decoupling these aspects from high power generation. Utilizing a gain-switched laser diode as a seed laser provides additional flexibility.

Modulation of the low-power seed laser or use of an optical modulator between the seed laser and power amplifier can be more beneficial than modulating high-power devices directly. Slower power modulation can be managed by adjusting the amplifier's pump power without affecting pulse duration or wavelength significantly.

Combining an existing laser with an amplifier chain can be simpler than developing a new high-power laser. Although, MOPA systems can present challenges like higher laser noise and sensitivity to back-reflections. Implementing a Faraday isolator can mitigate feedback sensitivity, but introduces limitations, particularly for high-power pulsed devices.

Stages of the Fiber Laser

1. Master Oscillator: The stage containing the graphene that produces pulsing.
2. Single-Mode Power Amplifier
3. Double-Clad Power Amplifier

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Master Oscillator with Graphene as Saturable Absorber

The master laser is a single-frequency seed laser used for injection locking one or more slave lasers. Typically, the master laser generates less optical power than the entire laser system, allowing very low laser noise levels, which can be transferred across the system. The system, featuring a ring cavity with Erbium-doped fiber as the lasing medium, uses a moderate power 975 nm diode laser pump and a graphene saturable absorber to achieve pulsed operation. This 1550 nm light then proceeds to the first stage of the power amplifier.

Erbium-Doped Fiber Amplifier

Erbium-doped fiber amplifiers are crucial in long-range optical fiber communications, efficiently amplifying light in the 1.5-µm wavelength region where telecom fibers have minimal loss. Pumping of Er3+ by 980-nm light produces stimulated emission in this region, significantly enhancing the 1550-nm signal from the master oscillator. The 980-nm signal is dumped after final WDM, passing only the amplified 1.5-µm signal to the next amplifier stage.

Length of Fiber

The Erbium-doped fiber lengths are optimized based on RP Fiber Power simulation.

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