Accession Number : ADP007872

Title :   Coupled-Cavity Modelocking of Solid-State Lasers using Quantum Wells,

Corporate Author : AT AND T BELL LABS HOLMDEL NJ

Personal Author(s) : Keller, U. ; 't Hooft, G. W. ; Knox, W. H. ; Woodward, T. K.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : The ultrafast physics of MQW samples have been studied extensively. We used this to passively mode-lock solid-state lasers with small gain cross section such as Ti:Sapphire and Nd:YLF lasers shows the laser cavity design which is called coupled cavity resonant passive mode-locking (RPM) - resonant because of the near-resonant nonlinearity in the coupled cavity. The excitation level of the MQW reflector is high with an average intensity of > 20 kW/cm2 and a peak intensity of > 20 MW/cm2 at 250 MHz repetition rate. The mode-locking disappears at lower excitation levels. Using the RPM Ti:Sapphire laser with its picosecond tunable pulses, we performed some pump-probe measurements on a separate piece of the same p-i-n MQW reflective modulator structure which mode-locks the Ti:Sapphire laser. We measure a fast reflectivity modulation with a time constant determined by the pump and probe pulse width superimposed on a long time transient due to carrier recombination, heating and screening of the built-in field.

Descriptors :   *LASER CAVITIES, *SOLID STATE LASERS, *MODE LOCKED LASERS, CONSTANTS, CROSS SECTIONS, EXCITATION, GAIN, INTENSITY, MEASUREMENT, MODULATION, MODULATORS, PROBES, PULSES, PUMPS, RATES, REFLECTIVITY, REFLECTORS, REPETITION RATE, TRANSIENTS, NEODYMIUM LASERS.

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE