Output Characteristics

Vanguard 355-2500 Vanguard 355-350
Wavelength 355 nm 355 nm
Power 2.5 W 350 mW
Repetition Rate 80 MHz ±2 MHz
Spatial Mode TEM00
M2 <1.2 <1.2
Far Field Divergence, full angle <1 mrad
Beam Diameter (1/e²) 1.0 mm nominal 1.0 mm nominal
Beam Pointing Stability <20% far field
Average Power Stability <1% rms, 10 Hz to 2 MHz
Polarization Ratio >100:1 vertical
Cold Turn-on Time (AC off to full power) <30 min
Cold Turn-on Time (AC off to full specs) <1 hr
Temperature Range 20-27°C
Laser Head Cooling Water cooled Air cooled


  1. Due to our continuous product improvement program, specifications are subject to change without notice.
  2. Vanguard is a Class IV - High-Power Laser, whose beam is, by definition, a safety and fire hazard. Take precautions to prevent exposure to direct and reflected beams. Diffuse as well as specular reflections can cause severe skin or eye damage.



Spectra-Physics® Vanguard lasers are DPSS lasers specifically designed to produce exceptionally reliable quasi-CW output at 355 nm. This family of rugged OEM lasers uses advanced mode-locking technology to deliver picosecond pulses with low noise and excellent TEM00 mode quality. Vanguard lasers are available with 350 mW at 355 nm and 2.5 W at 355 nm, each providing ultrafast pulse trains with outstanding long-term stability.

Vanguard lasers were developed for demanding 24x7 OEM applications, emphasizing consistency and uptime, low cost of ownership, and ease of integration. Designed for the stringent requirements of semiconductor wafer processing, they have found ready acceptance in cell-sorting flow cytometry, synchronous dye-laser pumping, and micro-material processing applications where their superb reliability and dependability are similarly appreciated.

Vanguard 24x7 Quality and Reliability

The Vanguard series of lasers are field proven with over 1,000 systems installed. Every feature of the Vanguard is designed for continuous and consistent operation for in demanding applications. The system can be remotely controlled via an RS-232 interface, and incorporates extensive on-board data logging of key parameters. Closed-loop power control ensures consistent output power to less than 2% variation from the specified level. Designed for convenient preventative maintenance, adjustment of the THG crystal (for the UV systems) and the Saturable Absorber Mirror (SAM) optimizes performance and extends the Vanguard laser’s operational life. The diode module has demonstrated exceptionally long life, and being remotely located in the power supply enables easy replacement without impacting the laser head alignment.

Spectra-Physics’ patented technology establishes the system reliability. Our proprietary manufacturing technology ensures product quality. Our tightly controlled supply chain makes for consistency. World-class service and expert technical support are provided as standard from the global leader in photonics.

Compatible Power Sensors

To verify and analyze the output power of your Vanguard laser, we recommend the Ophir 3A  (7Z02621) thermal power sensor and Centauri laser power meter.  Additional information on this laser measurement equipment can be found on the ophiropt.com website.  Other Ophir sensors and meters may also be suitable for the Vanguard, depending on application. Ophir also works with laser system developers to achieve embedded beam diagnostics to monitor system performance as an OEM solution.