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Visible intracavity laser spectroscopy with a step-scan Fourier-transform interferometer
Applied Optics
|February 12, 2008
Summary
Time-resolved measurements using Fourier-transform spectrometry in step-scan mode reveal laser pulse evolution in intracavity laser spectroscopy (ILS). This technique offers high spectral and temporal resolution for studying laser and absorption dynamics.
Area of Science:
- Spectroscopy
- Laser Physics
Background:
- Intracavity laser spectroscopy (ILS) traditionally uses diode arrays.
- Conventional ILS can be limited in infrared and near-infrared applications due to cost or feasibility.
Purpose of the Study:
- To develop and validate a time-resolved measurement technique for laser pulse evolution in ILS.
- To assess the feasibility of using Fourier-transform spectrometry in step-scan mode for ILS.
Main Methods:
- Utilized a Fourier-transform spectrometer in step-scan mode.
- Recorded spectra of broadband dye laser pulses (~615 nm) with high spectral (0.5 cm⁻¹) and temporal (up to 5 µs) resolution.
- Investigated pulse height dependence on generation time (t_g) and tested system linearity/sensitivity using a CH₄ overtone transition.
Main Results:
- Demonstrated time-resolved measurements of evolving laser pulses in ILS.
- Observed pulse height proportional to t_g^(0.57) for generation times up to 500 µs.
- Achieved comparable performance to conventional ILS systems.
Conclusions:
- The developed Fourier-transform spectrometer in step-scan mode is a viable alternative for ILS.
- This system offers advantages for studying laser and absorption dynamics, especially at infrared wavelengths.
- Feasibility for future infrared and near-infrared ILS applications was established.
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