ABSTRACT
We report a dual-frequency injection-locked nanosecond pulsed laser oscillating at an arbitrary combination of two frequencies over the broad gain range of a Ti:sapphire laser. This performance is achieved by employing two techniques. One involves introducing two different modulation frequencies to discriminate electronically the error signals, which are used for locking the two seed frequencies to the forced oscillator. The other is a cavity design that enables us to sweep the cavity length without distorting the alignment or changing the spatial mode of the cavity. The difference frequencies in a pair of single-frequency nanosecond pulses can be selected continuously from less than 1 GHz to tens of THz without modifying the laser configuration.
Subject(s)
Lasers , Nanotechnology/instrumentation , Oscillometry/instrumentation , Telecommunications/instrumentation , Transducers , Computer-Aided Design , Equipment Design , Equipment Failure Analysis , Microwaves , Terahertz RadiationABSTRACT
The characteristics of a dual-wavelength injection-locked pulsed laser are systematically studied. A simple and effective model is proposed to quantitatively study this type of laser system. It is shown that the model precisely predicts the performance of such a system over a wide spectral region and a full dynamic range. Furthermore, the results confirm the accuracy of the assumption regarding the homogeneous broadening in Ti:sapphire lasers, and also prove that competition between the two wavelength components does not induce instability.
ABSTRACT
An injection-locked pulsed Ti:sapphire laser oscillating at dual wavelengths is demonstrated for the first time to our knowledge. By use of two feedback loops, seeds of two independent master lasers are locked on specific longitudinal modes of a power oscillator, leading to a stable dual-wavelength oscillation over a long time scale. The two injection-locked pulsed outputs completely overlap in time, with spectral purities reaching a Fourier-transform limit. The dual-wavelength oscillation is controlled by the master lasers only, allowing for flexible selectivity of the two wavelengths and full controllability of the relative two-wavelength pulsed energies.
ABSTRACT
A train of highly-stable, high-beam-quality ultrashort pulses is successfully produced by synthesizing phase-coherent rotational-Raman-sidebands in parahydrogen. The-intensity-waveform of this ultrashort-pulse-train is directly evaluated in time domain based on a sum-frequency-generation autocorrelation-technique. It is shown that a 10.6-THz ultrahigh-repetition-train of short pulses is formed with an effective-duration of 20 fs and a high peak-power of 2 MW.
