Maximum Single-frequency Output Power Research Articles

Theoretical and experimental study of a single frequency Tm,Ho:YLF laser

We present a theoretical and experimental analysis of a diode-pumped single frequency Tm,Ho:YLF laser. A new model for a diode-pumped Tm,Ho:YLF quasi-three-level laser is described. The influence of energy-transfer up-conversion (ETU) and ground-state re-absorption (GSA) has been taken into account. When the incident pump power is 2.8 W, a maximum single frequency output power of 118 mW is obtained from the Tm,Ho:YLF laser at room temperature. The line narrowing elements used are two solid etalons. The single frequency laser can be used as a seed laser for either a larger oscillator or an amplifier. The theoretical results are in good agreement with experimental data.

Singlemode Er:Yb waveguide laser array at 1.5 [micro sign

An array of waveguide lasers operating at 1533 nm has been fabricated on Er:Yb-doped glass substrate by the silver-sodium ion-exchange technique. The maximum single-frequency output power from a single channel is 0.8 mW, with a relative intensity noise of –82 dB/Hz at the relaxation oscillation peak and below approximately –150 dB/Hz for frequencies higher than 2 MHz.

Single-frequency lasing of monolithic Ho,Tm:YLF

Single-frequency lasing in monolithic crystals of holmium-thulium-doped YLF (Ho,Tm:YLF) is reported. A maximum single-frequency output power of 6 mW at a wavelength of 2.05 microm is demonstrated. Frequency tuning is also described.

Radiative characteristics of injection lasers with short resonators

An investigation was made of the threshold, power, and spectral characteristics of radiation emitted by GaAs--AlAs heterostructure injection lasers with double confinement and short (up to 16 ..mu..) plane-parallel resonators. The lasers had mesastripe contacts 10--14 ..mu.. wide. The gain coefficient was a linear function of the pump current density in the gain coefficient range 10--400 cm/sup -1/. The minimum threshold currents in the lasers were 27--30 mA and single-frequency lasing regime was observed right up to pump currents of (1.6--1.7)I/sub th/. The maximum single-frequency output power was 35 mW. It should be possible to retain single-frequency regime in such lasers when the pump current was subjected to high-frequency modulation.

Load-rating theory for multichannel amplifiers

The amplifiers of multichannel telephone systems must be so designed with regard to output capacity that interchannel interference caused by amplifier overloading will not be serious. Probability theory is applied to this problem to determine the maximum single-frequency output power which a multichannel amplifier should be designed to transmit as a function of N, the number of channels in the system. The theory is developed to include the effects of statistical variations in the number of simultaneous talkers, in the talking volumes, and in the instantaneous voltages from speech at constant volume.

Load-Rating Theory for Multichannel Amplifiers

The amplifiers of multichannel telephone systems must be so designed with regard to output capacity that interchannel interference caused by amplifier overloading will not be serious. Probability theory is applied to this problem to determine the maximum single-frequency output power which a multichannel amplifier should be designed to transmit as a function of N, the number of channels in the system. The theory is developed to include the effects of statistical variations in the number of simultaneous talkers, in the talking volumes, and in the instantaneous voltages from speech at constant volume.

Load Rating Theory for Multi-Channel Amplifiers*

The amplifiers of multi-channel telephone systems must be so designed with regard to output capacity that interchannel interference caused by amplifier overloading will not be serious. Probability theory is applied to this problem to determine the maximum single frequency output power which a multi-channel amplifier should be designed to transmit as a function of N, the number of channels in the system. The theory is developed to include the effects of statistical variations in the number of simultaneous talkers, in the talking volumes, and in the instantaneous voltages from speech at constant volume.