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- Laser Model: TOPTICA OPO (TOPO)
- Description: A mid-infrared, continuous wave, singly resonant optical parametric oscillator. The OPO system consists of a distributed feedback diode laser (TOPTICA DFB pro BFY) and a fiber amplifier (FA), which produces 10 W of cw light. The output of the FA, referred to as the pump, is centered at λp = 1064 nm and was tunable by ∼ 4 nm (35 cm−1). Two beams are produced as a result of the OPO process, namely, a signal beam, tunable in the range 1450-2070 nm and an idler beam, tunable in the range 2190-4000 nm.
- Applications: The TOPO range is 1.45 - 4.00 μm. Most of combustion species have absorption spectra in that range, whether it is caused by the C-H stretching, C-O stretching, or N-H stretching modes.
- Controlling/tuning method(s): Motor position, crystal position, temperature, etalon angle.
- Specifications:
| Specification | Value/type |
|---|---|
| Wavenumber coverage (cm-1) | 2500 - 6900 |
| Wavelength coverage (μm) | 1.45 - 4 |
| Mode-hop free? | Yes |
| Pulse or cw? | cw |
| Linewidth (MHz) | 2 |
| Maximum tuning speed | 2 cm-1/min |
| Maximum power (W) | 10 |
- TOPO Setup:
