CW-MHF Mid-IR Laser: Mid-IR spectroscopy

The CW-MHF Mid-IR Laser is ideal for high-resolution mid-IR spectroscopy. If users require excellent spectral resolution, phase-continuous tuning to avoid hopping across spectral lines, or both, the DRS Daylight CW-Mode-Hop-Free laser will fulfill those requirements.

Narrow-linewidth operation and MHF tuning are extremely difficult to achieve in any laser system. The CW-MHF system is unique in the market, with open-loop line widths of ≤ 5 MHz (over 100 ms) and MHF tuning to > 30 cm–1, and often > 100 cm–1.

The CW-MHF laser achieves this performance via years of precise engineering and manufacturing knowledge, as well as a very stable laser cavity that was engineered to be less susceptible to acoustic perturbation using finite element analysis.

The CW-MHF laser also has two techniques to adjust wavelength: PZT or current modulation. This unique combination of broad MHF tuning, narrow-linewidth operation, and modulation capabilities allows for high-resolution spectroscopy and/or locking to a wavelength reference.


Features & benefits:

  • Wavelength accuracy of ± 0.5 cm–1 (± 15 GHz), unidirectional
  • Ultra-quiet, with RIN as low as -140 dBc/Hz, enables higher-SNR spectroscopy
  • Superb TEM00 beam quality, low beam pointing
  • SideKick™ controller, GUI, and SDK included with all systems
  • Proprietary HFQD™ circuitry to safeguard the chips
  • Wavelength availability: <4 to >11 µm
  • MHF tuning range: ≥ 30 to 100 cm–1 (typical, depending on model)
  • CW power > 70 mW typical*
  • Linewidth (FWHM < 5 MHz (10 ms) and < 10 MHz (1s)

Techniques and applications

The CW–MHF Mid-IR Laser's industry-leading performance and distinctive feature set make numerous sensitive spectroscopy methods and applications possible.

Spectroscopy techniques

  • Photoacoustic
  • Gas phase
  • High resolution
  • Rotational-vibrational
  • Cavity ring-down


  • Process control
  • Nanoscale imaging
  • Biomarker detection in breath
  • Chemical and biological agent sensing
  • IR sensor development
  • Environmental monitoring
  • Fence line monitoring
  • Combustion diagnostics
  • TIC, VOC, GHG, and explosives detection

Product specifications

Source: DRS Daylight Solutions Inc.

. . .
Operation Continuous wave, mode-hop-free (CW-MHF) and extended CW tuning
Center Wavelength Availability < 4 to > 11 µm

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