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Opal Femtosecond OPO

Opal Femtosecond OPO

Product catalog summary

Introduction
The Spectra-Physics Opal® is a synchronously pumped parametric oscillator (SPPO) that provides tunable femtosecond pulses ranging from 1.1 to 2.25 microns. It extends the capabilities of the Tsunami™ ultrafast Ti:sapphire laser into the infrared spectrum and offers frequency-doubled access to visible regions not covered by Ti:sapphire alone. The Opal is a compact, turnkey instrument with solid-state construction for reliability and ruggedness.

Temperature Tunability
Opal generates tunable ultrafast pulses in the infrared by parametric generation, converting a single shorter wavelength photon into two longer wavelength photons, known as signal and idler outputs. The phase matching condition for efficient optical parametric conversion is achieved by adjusting the temperature of a fixed-angle LBO crystal. Wavelengths can be adjusted from 1.1 to 2.25 microns using automated controls.

Automated Cavity-Length Matching
The Opal requires synchronization of pump pulses from the Tsunami with the signal pulses in the Opal cavity. This synchronization is automated, allowing for multi-wavelength pump-probe experiments with femtosecond time resolution. The Opal can also generate mid-IR wavelengths through difference frequency mixing.

Hands-free Operation and Wavelength Tuning
Opal offers fully automated wavelength scans with temperature and cavity length stabilization controlled by a microprocessor. A user-friendly LCD panel provides access to control menus for setup, scan information, output power, and operational parameters. Wavelength scans over 50 to 100 nm can be initiated without manual intervention.

Opal Advantages

Wide spectral coverage from 1.1 to 2.25 µm.
Automated wavelength tuning.
Ultrafast pulses less than 130 femtoseconds.
High output power exceeding 200 mW at specific wavelengths.
Simple operation with menu-driven electronics.

Applications

Semiconductor research and spectroscopy.
Cavity ring-down spectroscopy.
Fiber optics and optical communications.
Vibrational overtone spectroscopy.
Time-resolved spectroscopy.
Multiple wavelength pump-probe experiments.

Performance and Specifications
Opal's performance includes average power over 250 mW at 1.3 µm and 200 mW at 1.5 µm, pulse width under 130 fs, and a tuning range from 1.10–1.60 µm. It operates at a nominal repetition rate of 80 MHz with noise under 0.2% and stability under 5%.

Conclusion
The Opal, combined with the Tsunami and Millennia lasers, offers a stable and easy-to-use OPO solution for scientific applications requiring infrared wavelengths, providing simplicity unmatched by other OPOs.

Catalog excerpts

FemtosecondSynchronously Pumped Parametric Oscillator >

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The Spectra-Physics Opal > is asynchronously pumped parametric oscillator (SPPO) that delivers tunable femtosecond pulses from 1.1 to 2.25 microns. Opal enhances the versatility of the Tsunami > The Opal Advantage. Wide continuous spectral coverage:synchronized signal and idler outputs deliver wavelengths from1.1to 2.25 m > ՙ ultrafast Ti:sapphire laser byextending its output into the infrared. In addition, Opal also provides frequency- doubled access to the missingӔ visible region not accessible by Ti:sapphire alone. Opal features all solid-state constructionfor maximum reliability and ruggedness....

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Opal cavity layout (includes prisms when using short wavelength mirror set). Millennia and TsunamiThe Ultimate Pump Combination To achieve optimum performance, asynchronously pumped oscillator requires a pump source with high stability, high peak power, and excellent beam characteristics, including beam pointing stability. It must also deliver a constant pulse repetition rate to minimize cavity length adjustments. In the case of a synchronously pumped parametric oscillator such as Opal, the non-linear effect is very short lived, and the pump laser requirements are even tighter. The Spectra-Physics...

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