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MICRO-CONTROLE / Spectra-Physics
3900S Titanium:Sapphire CW Laser

3900S Titanium:Sapphire CW Laser

Product catalog summary

Introduction
The 3900S Ti:sapphire laser, introduced in the 1980s, marked a significant advancement in near-infrared laser technology. It combines tunable continuous wave (CW) output with solid-state reliability, maintaining its leadership in applications like IR Raman spectroscopy and photodynamic therapy.

Ti:Sapphire Tunability
Ti:sapphire is a durable laser material that does not degrade over time. It offers solid-state reliability, stability, and broad tunability, pumped by green lasers like the 532 nm Millennia® lasers. The 3900S allows smooth tuning by rotating a micrometer control, with high gain and damage thresholds.

Continuous Wavelength Tuning
The 3900S provides continuous tuning from 700 to 1000 nm using advanced broadband optics. It includes a standard mirror set and a tunable birefringent filter, with options for extended blue and red mirror sets for edge spectral range operation.

Simple Cavity and Operation
The laser features a simple cavity design with reflective optics, requiring no adjustments during wavelength tuning. It is easy to set up and align, using a horizontal Z configuration to prevent stray light and simplify alignment.

Stable TEM00 Output
The 3900S produces a stable TEM00 output beam with an M2 value of less than 1.1. It offers power fluctuations of less than ±1% and horizontal polarization. A sealed laser cover and optional nitrogen purge enhance stability and allow tuning through the 980 nm region.

Variable Linewidth
The laser's linewidth is approximately 40 GHz, adjustable to 15 GHz or below 1 GHz with optional etalons. This feature supports spectroscopy and other applications requiring narrow linewidths.

Vertical Integration
Spectra-Physics emphasizes vertical integration, manufacturing and testing all key components in-house to ensure high performance and reliability. A global service network supports any issues.

Applications and Use
The 3900S is used by the European Space Agency for atmospheric studies in space communication, chosen for its high power output and accuracy.

Millennia Pump Laser
The Millennia laser, introduced in 1996, is the preferred pump source for Ti:sapphire lasers, offering high power CW visible output with excellent spatial mode and low noise.

Catalog excerpts

3900S Tunable CW All Solid State Ti:sapphire Laser

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When it was introduced in the 1980s, the first generation 3900S laser was widely recognized as a major breakthrough in near-infrared laser technology, combining smoothly tunable CW output with solidstate reliability and simplicity. Thanks to advances in broadband optics, solid state visible pump lasers, and improved control systems, the updated 3900S has retained its clear leadership position in the market and sets new performance standards in a wide range of applications, including IR Raman spectroscopy, “optical tweezers,” photodynamic therapy, and spectroscopy of semiconductor materials. Ti:Sapphire...

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typical M2 value of less than 1.1, allowing the beam to be precisely collimated or focused to a near-diffraction limited spot. During normal operation, typical power fluctuations are less than ±1% and the output beam is horizontally polarized with an extinction ratio of 100:1 or better. For even greater stability, the laser cover can be sealed and the cavity purged with dry nitrogen. This purging also allows the laser to be tuned through the 980 nm spectral region with no slight power dips due to the well-known water absorption bands at this wavelength. An optional dry nitrogen purge box will...

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Millennia—The Ultimate Pump Laser for the 3900S In 1996, Millennia was the first all-solid-state laser to provide high power CW visible output and immediately became the first choice for pumping Ti:sapphire lasers. Orders of magnitude more rugged and reliable than previous ion lasers, the Millennia is the best turn-key source of pump light available today. The sealed cavity design needs no adjustment, and produces the ideal combination of excellent spatial mode (TEM00), beam pointing and ultra-low-noise output. With a choice of 5, 8 or 10 watts at 532 nm, this compact laser is ideal for the crowded...

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