ABSTRACT
Watt-level yellow emitting lasers are interesting for medical applications, due to their high hemoglobin absorption, and for efficient detection of certain fluorophores. In this paper, we demonstrate a compact and robust diode-based laser system in the yellow spectral range. The system generates 1.9 W of single-frequency light at 562.4 nm by cascaded single-pass frequency doubling of the 1124.8 nm emission from a distributed Bragg reflector (DBR) tapered laser diode. The absence of a free-space cavity makes the system stable over a base-plate temperature range of 30 K. At the same time, the use of a laser diode enables the modulation of the pump wavelength by controlling the drive current. This is utilized to achieve a power modulation depth above 90% for the second harmonic light, with a rise time below 40 µs.
ABSTRACT
We describe a beam-deflection technique based on the ultrafast electronic Kerr effect for measuring the duration of ultrashort laser pulses in a wide spectral range. Using this method, which provides the third-order intensity correlation function, we have measured subpicosecond KrF laser pulses. The results are in good agreement with the Kerr-shutter autocorrelation measurement.
ABSTRACT
We present a method that allows the single-shot measurement of femtosecond pulses in the ultraviolet as well as the visible spectral regions. The method is based on the optical Kerr shutter technique, and it provides the third-order intensity correlation function.
ABSTRACT
The amplification of femtosecond light pulses in multistage as well as in traveling-wave dye amplifiers is studied numerically, taking into account group velocity dispersion, self-phase modulation that is due to Kerr-type nonlinearity, and gain depletion. The combined action of these processes results in a spectral broadening that can be utilized for pulse compression. The results are compared with experimental findings.
