FIRL-100 Terahertz Laser (7.5 THz - 0.25 THz) | Edinburgh Instruments
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FIRL-100 Terahertz Laser (7.5 THz - 0.25 THz)

FIRL-100 Terahertz Laser (7.5 THz - 0.25 THz)

  • Tunable emission: 40 μm – 1.2 mm (7.5 THz – 0.25 THz)
  • Output FIR powers > 150 mW on selected lines
  • Integrated CO2 Pump Laser and FIR cavity in one enclosure
  • Accessible 50 W CO2 line output
  • ±2% power and ±1 MHz optional stabilisation up to 1 hour
  • Applications include: Interferometry, plasma diagnostics, fusion energy research, THz spectroscopy, THz holography

Product Description

The FIRL-100 has both the CO2 pump laser (PL5) and the FIR laser (295-FIR) housed in an integrated structure combining a highly efficient optically pumped FIR system into a single compact unit. The lasers and coupling optics are mounted within a 5 bar invar rod frame for excellent thermal and mechanical stability.


The CO2 section provides 80 lines between 9.1 μm and 10.9 μm and features a flowing gas single discharge tube giving more than 50 W on the strongest lines. Mode performance (M2 <1.25) is assured by internal profiling of the tube and the use of high quality optics. The resonator design is based on the proven PL5 laser with diffraction grating, two ZnSe Brewster windows and piezo ceramic mounted ZnSe output coupler.

The CO2 laser output is coupled into the FIR laser via two steering mirrors and a ZnSe focussing lens. Access to the CO2 radiation beam diagnostics for Infrared experiments is available via a precision, two position sliding mirror mechanism.

Technical Specifications

Tuning Range 40 µm to 1.222 mm
Mode > 90% TEM00 on main mode
Beam Diameter 11 mm
Polarisation Parallel or perpendicular to input pump laser (depends on FIR laser gas and line)
CO2 Laser Output 80 lines accessible at 9.1 µm – 10.9 µm
50 W on the strongest line
Cooling Closed cycle thermocirculator

FIRL-100 Output of selected lines
Wavelength (µm) FIR Molecule CO2 Pump Line Typical Power
96.5 CH3OH 9R10 60 mW
118.8 CH3OH 9P36 150 mW
184.3 CH2F2 9R32 150 mW
432.6 CH3OH 9R20 30 mW
513 CH3OH 9R28 10 mW


Laser Stabilisers

For applications demanding excellent medium and long tern stability, an active stabiliser may be required. This will compensate for laser output fluctuations caused by changes in ambient conditions and lock the variation in laser frequency or power to a value close to the passive jitter. Edinburgh Instruments has designed a family of active stabilisation techniques appropriate to the type of laser and operating conditions. Stabilisation of laser output is possible for up to 60 minutes.

Laser Pumping and Refilling Systems

All flowing gas laser systems are supplied with the necessary valves, gauges and vacuum couplings for simple connection to the system vacuum pump. A range of turbo molecular and dry pumps are available as upgrades. Please contact us for more information.

Gas Mixing Stations

These are designed to allow mixing and metering of up to 3 component gases from independent gas cylinders. Comprising of 3 inlet ports with individual flow meters or needle valves for gas mixing or gas flow operation.