Abstract: An ultrafast laser providing short output pulses having a pulse length in the femtosecond range includes a resonant cavity including a plurality folding mirrors for folding the resonant cavity to shorten its overall length. The fold-mirrors each include a plurality of layers deposited by ion-beam sputtering onto a substrate having a surface roughness of less than about 0.5 nanometers RMS. One or more of the folding mirrors may have a negative-group-velocity-dispersion mirror for allowing the laser to operate in a pulsed mode with pulses having a length of less than 500 femtoseconds.

Abstract: An ultrafast laser providing short output pulses having a pulse length in the femtosecond range includes a resonant cavity including a plurality folding mirrors for folding the resonant cavity to shorten its overall length. The fold-mirrors each include a plurality of layers deposited by ion-beam sputtering onto a substrate having a surface roughness of less than about 0.5 nanometers RMS. One or more of the folding mirrors may have a negative-group-velocity-dispersion mirror for allowing the laser to operate in a pulsed mode with pulses having a length of less than 500 femtoseconds.

Abstract: A board game representing the lighter, non academic aspects of college or university life is disclosed. The game incorporates various activities commonly perceived to be engaged in by college or university students, including physical interaction between players of opposite sexes and social drinking, although such drinking is not necessarily limited to alcoholic beverages during the play of the game. The game is played on a generally peripheral path on the game board, the path containing various instructions relating to social drinking and/or physical interaction between players or teams of opposite sexes, or the drawing of cards containing such instructions. The completion of a lap of the playing path represents the completion of some academic period such as a school year, the winner determined as the first player or team to complete a predetermined number of laps of the playing path. Alternatively, the player or team farthest ahead at the end of a given elapsed time may be declared the winner.

Abstract: A modulating and demodulating system for converting a plurality of baseband space division signals to a frequency division multiplexed signal. The baseband signals are sequentially sampled and converted in an analog-to-digital converter to a series of digital words. Predetermined mathematical algorithms incorporating digital filters, multipliers and shift registers are used to convert the series of digital words to a frequency division multiplexed digital signal. Aliasing of the baseband signals provides the required dispersion through a predetermined frequency range. A digital to analog converter coupled to a conventional balanced mixer and oscillator is then used to up convert the resulting signal to the desired frequency range. A high pass filter is used to remove the image frequencies. The resulting frequency division multiplexed signal may be transmitted by conventional means to a remote location where demodulation is accomplished essentially by reversal of the modulation process.