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Tunable Laser - CW/Pulsed

The Tunable CW/Pulsed External Cavity Quantum Cascade Laser (ECqcL™) system is the laboratory work horse of the mid-IR, providing widely tunable Pulsed or CW output (with CW compatible gain chips) from a single laser head. With a broad selection of gain chips available, CW/PLS can be factory-configured for a wide range of applications.


  • CW or pulsed output
  • Wide wavelength selection (<4 µm to >11 µm)
  • Wide tuning ranges
  • High output power
  • Narrow linewidths
  • Superb beam quality
  • Next-generation compact, low-noise controller
  • Room-temperature operation


  • Versatile, one-box solution
  • Application-optimized output
  • Measure more molecules per gain chip
  • Higher SNR, sensitivity, standoff distance
  • Higher spectral resolution and brightness
  • Higher spatial brightness
  • Greater ease of use, control & integration
  • No cryogenic cooling (water needed for CW output)

Product Details

Daylight’s CW/Pulsed lasers are offered with a wide selection of center wavelengths spanning the mid-IR spectrum from <4 μm to >11 μm, and tuning ranges exceeding 100 cm-1. With our commitment to ongoing gain chip development, new expanded tuning ranges and higher output powers, our list of available models grows on an ongoing basis. Even if you don’t see what you need on our website, please contact us to tell us what you need.

All lasers provide Pulsed operation and, if a suitable CW-capable chip is selected, these lasers can also provide effortless switching between Pulsed and CW modes. Pulsed operation offers the advantage of high peak power and time resolution, while CW operation provides narrow linewidth operation. (If you need guaranteed single longitudinal mode operation and phase-continuous tuning, please take a look at our award-winning CW Mode-Hop-Free laser.)

Daylight Solutions’ laser systems leverage our more than ten years of mid-IR laser development and manufacturing knowhow, and incorporate the company’s latest tuning and packaging technology. Our patented1 miniature QCL collimating lenses, for example, enable high-quality output beam quality. Each laser system also integrates thermoelectric cooling for convenient room-temperature operation. In Pulsed operation, the lasers are passively cooled, and even in CW mode only a small, closed-loop water chiller is needed– no cryogenic cooling ever!

Each CW/Pulsed laser system includes an intuitive, easy-to-use multifunction SideKick™ laser controller featuring GUI and SDK-based user interfaces via USB or Ethernet . And our field-proven High-Fidelity Quantum Cascade Drive (HFQD™) circuity protects your valuable gain chip.

With a great blend of wide wavelength choice, wide tuning range, high-quality light output and CW and Pulsed operation from a single laser head, CW/Pulsed lasers enable research in multiple fields of molecular detection and imaging. Applications include: nano-scale imaging; microscopy; industrial process controls; detection of biomarkers in the breath; cellular imaging; and detection of chemical and biological agents.

Call today for pricing and availability of specific wavelengths.

1 This product may be covered by one or more of U.S. Patent Nos.: 7,424,042; 7,466,734; 7,492,806; 7,535,656; 7,535,936; 7,733,925; 7,796,341; 7,826,503; 7,873,094; 8,027,094; 8,050,307.


Product Specifications
Operation Pulsed or CW2
Model Number Nominal Center
Wavelength (µm)
Nominal Center
Wavenumber (cm-1)
Tuning Range
TLS-41032 3.25 3,080 TBD
TLS-41036 3.55 2,820 70
TLS-41038 3.8 2,630 80
TLS-41040 4 2,500 80
TLS-41042 4.2 2,380 70
TLS-41045 4.5 2,220 120
TLS-41047 4.7 2,130 70
TLS-41049 4.95 2,020 70
TLS-41052 5.2 1,920 110
TLS-41058 5.8 1,720 110
TLS-41060 6.05 1,650 110
TLS-41062 6.2 1,610 110
TLS-41074 7.4 1,350 100
TLS-41078 7.8 1,280 80
TLS-41090 8.9 1,120 80
TLS-41096 9.5 1,050 60
TLS-41105 10.4 960 60
CW Performance
Power Depends on wavelength, typically > 100 mW
Linewidth ≤100 MHz
Wavelength Drift
≤0.05 cm-1/8 hr
Current Modulation
Bandwidth DC-1 MHz
Amplitude Depth
Frequency Depth
~0.05 cm-1
Pulsed Performance
Linewidth ≤1 cm-1
Peak Power
Depends on wavelength, typically > 100 mW
Average Power
Depends on wavelength, typically > 5 mW
Power Variation
<2% rms
40-500 ns (20 ns increments)
Repetition Rate
0.1-100 kHz (100 Hz increments)
Max Duty Cycle
Overall Performance
Tuning Speed ≥100 cm-1/s
Wavelength Accuracy ±1.5 cm-1 (Uni-directional)
Display Repeatability ≤0.02 cm-1
Beam Divergence <5 mrad
Beam Pointing Stability <1 mrad over 100 cm-1 tuning
Polarization Linear, Vertical , 100:1
Beam Spatial Mode TEM00
Beam M2 ≤1.3
Spot Size <2.5 mm (1/e point)
Control Specifications
Control Interface SideKick SK-1000
HFQD-enabled Yes
Pulse Triggering Internal or external trigger, external pulse input
Scan Triggering External wavelength step, scan start
External Control Interfaces USB 2.0, Ethernet 10/100
Operating Specifications
Operating Temperature Range 15-35 °C
Cooling (Pulsed) Passive Air
Cooling (CW) Chilled water
Power Requirements 100-240 VAC, 50-60 Hz, single phase
Mechanical Specifications
Head Dimensions 5.50 x 3.45 x 3.31”
Controller Dimensions 7.3 x 5.2 x 1.4”

1 All specifications subject to change without notice
2 TLS-41036 operates only in pulsed mode

Industries & Applications

  • Nano-scale imaging & IR microscopy
  • Photoacoustic spectroscopy (PAS)
  • Hyperspectral imaging
  • Time-Resolved IR Spectroscopy

  • Explosives detection
  • Chemical warfare agent detection
  • Infrared countermeasures (IRCM)
  • Infrared scene projection
  • Thermal laser pointing
  • Illumination
  • Photoacoustic spectroscopy
  • Standoff detection research
  • Hyperspectral imaging
  • Remote sensing
Life Sciences
  • Biomedical imaging
  • Glucose monitoring

  • Toxic industrial chemicals detection
  • Hydrocarbon detection
  • Process control
  • Hydrocarbon detection
  • Fence line monitoring
  • Toxic industrial chemicals detection
  • Gas leak detection

Literature & Downloads


Technical Papers

2014-07-24 Heterogeneously Integrated Silicon Photonics for the Mid-Infrared and Spectroscopic Sensing [PDF, 2.7MB]
2014-07-24 On-Chip Integrated Mid-Infrared GaAs/AlGaAs Mach−Zehnder Interferometer [PDF, 2MB]
2014-08-23, Noninvasive in vivo glucose sensing on human subjects using mid-infrared light
In vitro measurements of physiological glucose concentrations in biological fluids using mid-infrared light [PDF, 1MB]
Naval Research Laboratory 2012-06-27 Chemical Imaging using Infrared Photo-thermal Microspectroscopy
University of Alberta
Oak Ridge National Laboratory Separator
University of Tennessee
2012-03-09, Pump–probe photothermal spectroscopy using quantum cascade lasers [PDF, 800KB]
2011-10-10 Infrared nanoscopy of Dirac plasmons at the graphene-SiO2 interface






2011-07-12 Infrared Nanoscopy of Dirac Plasmons at the Graphene-SiO2 Interface, Z. Fei, D.N. Basov, et al.
Rice University QEPAS detector for rapid spectral measurements [PDF, 1MB]
University of Pennsylvania 2011-09-30: Achieving Secondary Structural Resolution in Kinetic Measurements of Protein Folding: A Case Study of the Folding Mechanism of Trp-cage
Infrared Signature and Folding Dynamics of a Helical β-Peptide [PDF, 694KB]
Army Research Laboratory
Development of a MEMS-Scale Photoacoustic Chemical Sensor Using a Quantum Cascade Laser [PDF, 240KB]
Selex Distributed nerve gases sensor based on IR absorption in hollow optical fiber [PDF, 4.46MB]
Brookhaven National Lab Application of External-Cavity Quantum Cascade Infrared Lasers to Nanosecond Time-Resolved Infrared Spectroscopy of Condensed-Phase Samples Following Pulse Radiolysis

White Papers

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