CW-MHF Mid-IR Laser: Precision in Mid-IR Spectroscopy

The CW-MHF Mid-IR Laser is the ideal instrument for high-resolution mid-IR spectroscopy. If users need high spectral resolution, phase-continuous tuning to avoid jumping over spectral lines, or both, the DRS Daylight CW-Mode-Hop-Free laser will suit their requirements. Narrow-linewidth operation and MHF tuning are extremely difficult to achieve in any laser system.

The CW-MHF system, which is unique in the industry, offers MHF tuning to > 30 cm–1 and frequently to > 100 cm–1, together with open-loop linewidths of ≤ 5 MHz (around 100 ms). The CW-MHF laser achieves this performance using an extremely stable laser cavity intended to limit sensitivity to acoustic perturbation, led by finite element analysis. This design draws on years of expertise in precision engineering and manufacturing.

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


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 are included with all systems
  • Proprietary HFQD™ circuitry to safeguard 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 & Applications

The CW-MHF Mid-IR Laser’s unique feature set and industry-leading performance allow for a wide range of sensitive spectroscopy techniques and applications.

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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