Coherent propagation of small-area pulses in activated crystals
Abstract
The coherent propagation of small-area picosecond pulses in Nd:YAG and ruby at 100 K is investigated theoretically and experimentally. The following phenomena are observed: (1) a variation in pulse shape upon propagation through an inverted medium, (2) a distinction between the amplification coefficient and the stationary Beer value, and (3) a transition from coherent to noncoherent amplification with increasing pulse duration. A connection was shown to exist between the coherent amplification of small-area pulses and the formation of superradiance pulses in an inverted medium. A change in wave form was also observed upon propagation of a small-area pulse through an absorbing medium; the pulse duration in the absorbing ruby sample was reduced and the absorption coefficient was smaller in comparison with the stationary Beer value. It is noted that the propagation regimes presently under investigation may be used to form ultrashort light pulses.
- Publication:
-
Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki
- Pub Date:
- May 1986
- Bibcode:
- 1986ZhETF..90.1596V
- Keywords:
-
- Coherent Light;
- Crystal Optics;
- Ultrashort Pulsed Lasers;
- Wave Propagation;
- Neodymium Lasers;
- Pulse Amplitude;
- Ruby Lasers;
- Waveforms;
- Yag Lasers;
- Lasers and Masers