Single Frequency CW DPSS 349 nm Laser BRaMMS-Duetto-349

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Single Frequency CW DPSS 349 nm Laser BRaMMS-Duetto-349

Single Frequency CW UV Duetto-349 diode pumped solid state lasers provide users unrivaled beam quality and reliability with optical output powers of 50-150 mW. Based on a highly reliable frequency doubled laser diode the Duetto-355 lasers have genuine single frequency and wavelength stability. The lasers emit an optical beam in single-spatial-mode (M² <1.1), and allow a minimum focusing and uniform illumination of the sample.

Wavelength, nm 349
Beam divergence, mrad ≤ 2.5 mrad, diffraction limited
Beam Pointing Stability, μrad/°C ≤ 5
Longitudinal Mode Structure SLM
Line Width, MHz ≤ 0.5
Line Spectral Position Stability, MHz (pm) ±50 (±0.2) within 4 hrs of CW operation
Coherence Length, m > 100
Mode Hops Free Fine Tuning Range, GHz 25 – 30 (optional)
Polarization Linear, Vertical; ≥100:1
Output Power Noise, % ≤ 0.1rms, ≤ 1p-p (10Hz – 10MHz)
Output Power Stability, % ≤2, within any 4 hours of CW operation
Working Temperatures, °C 18 – 30, conductive cooling via mounting interface
Storage Temperatures, °C 0 to 50
Humidity, % 5 -95, non-condensing
Operating Voltage, VAC 90 to 240
Frequency, Hz 50-60


The patented BRaMMS technology provides new wavelengths previously unattainable by CW single frequency DPSS lasers in UV, visible and near IR. It utilizes the spectrum discriminatory feature of a Michelson interferometer setup within a spectral range preselected by Volume Bragg Grating. This suppresses all but one lasing longitudinal mode within a laser cavity, hence – Bragg Range Michelson Mode Selector (BRaMMS).
Due to significantly lower power consumption for any required output and the resulting simplified thermal management, the BRaMMS laser technology provides up to 10 times wider range of output power scalability from the smallest footprint.

The Duetto-349 is a frequency doubled UV laser. In general Diode pumped solid state Nd:YVO4 lasers are frequency tripled to achieve 355 nm laser. Most of these lasers emit multi-longitudinal modes and need to be tuned to single-frequency operation. The Duetto-349 is inherently single-frequency laser by design. Benefits of our laser design include up to several orders of magnitude higher conversion efficiency, giving them unique output power scalability while eliminating the need for water cooling, a lack of mode beating and associated high frequency noise which often limits applicability, and the longest coherence length, over 100 m, effectively the path difference over which lasers can interfere. It could be used, for example, for laser lithography. In optical lithography, the structure of a photomask is transferred to a photosensitive resist by shadows or projection. The resolution is mainly determined by the wavelength of light used. As a variation this laser is also available with 349 nm output. The optical output power for the Duetto-349 could be up to 500 mW.

  • from 10 to 150 mW output power at 349 nm SLM
  • feedback locked Single Longitudinal Mode CW operation
  • mode hops and lock loss free
  • very low noise performance, < 0.1% rms
  • excellent beam quality from smallest footprint
  • lowest power consumption for given output
  • Laser lithography
  • Holography
  • Photoluminescence
  • Gratings
  • Raman spectroscopy
Name Output power, mWOutput Beam Diameter, TEM00, mmWarm up time, minPower Consumption, W Price Request

BRaMMs Duetto 349-0050

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