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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.
| Measurement Modes | Control Features | Data Manipulation and Display |
|---|---|---|
| Measurement setup | Wavelength / slit control | ΔOD calculation (automatic and manual) |
| Single kinetic measurement: – Transient absorption – Laser-induced emission | Grating selection | Arithmetic (+, -, x, /, append) |
| Multiple kinetic measurements: – Transient absorption – Laser-induced emission | Pump laser flashlamp trigger | Scaling |
| Time-Resolved Absorption Spectra (TRAS) | Pump laser Q-switch trigger | Normalise |
| Time-Resolved Emission Spectra (TRES) | Probe source pulse current | Baseline subtraction |
| Stop-flow mode for use with optional stopped flow accessory | Pump and probe shutters | Smooth |
| Oscilloscope trigger (K mode) | Data slicing – TRAS | |
| Oscilloscope time base (K mode) | Data slicing – TRES | |
| Signal offset (K mode) | Full data reconvolution using non-linear least square fitting routine | |
| Time shift / delay (K mode) | 2D, 3D, Contour plotting and text | |
| ICCD gain (KS mode) | ||
| ICCD gate delay and gate width (KS mode) | ||
| ICCD temperature (KS mode) | ||
| Optional temperature-controlled sample holder | ||
| Optional cryostat mounting | ||
| Stop-flow synchronisation |
| 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 |
