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Regenerative Rubidium Maser Oscillator

Maurice Arditi, T. R. Carver

Continuous self-sustained oscillations at 6834 Mc/sec were obtained with an optically pumped rubidium maser amplifier in a regenerative feedback loop. Some additional gain introduced by a parametric amplifier was required. The use of pulsed light for optical pumping permits the study of the oscillation build-up under various experimental conditions.

Journal of Applied PhysicsFeb 1, 19658 citations

Oscillation Characteristics of a Pulsed Ruby Maser

Fujio Saito

Pulsed oscillation of a three-level ruby maser of which pumping microwave was modulated by pulse was investigated. The time lag t d of the oscillation pulse behind the pumping pulse was determined experimentally as a function of the peak level P of the pumping power, and the period T and the width τ of the pumping pulse. A semi-empirical formula t d =t 0(\frac{P_{c}}{P}) k exp [b(\frac{T}{\tau})1-δ\frac{P_{c}}{P}] was obtained. The minimum pulse width τ m required for the oscillation to occur was determined as a function of P and T, which was approximately expressed by τ m =c\frac{T^{m}}{P^{n}}. The above results were qualitatively interpreted in terms of excess population Δ n,Pulsed oscillation of a three-level ruby maser of which pumping microwave was modulated by pulse was investigated. The time lag t d of the oscillation pulse behind the pumping pulse was determined experimentally as a function of the peak level P of the pumping power, and the period T and the width τ of the pumping pulse. A semi-empirical formula t d =t 0(\frac{P_{c}}{P}) k exp [b(\frac{T}{\tau})1-δ\frac{P_{c}}{P}] was obtained. The minimum pulse width τ m required for the oscillation to occur was determined as a function of P and T, which was approximately expressed by τ m =c\frac{T^{m}}{P^{n}}. The above results were qualitatively interpreted in terms of excess population Δ n,

Japanese Journal of Applied PhysicsAug 1, 19621 citation

Adiabatic Rapid Passage in Ruby at 8 mm Wavelengths†

J. S. Thorp, J H Pace, David Sampson

An investigation of adiabatic rapid passage has been made in ruby at 8 mm wavelengths. Performance data are given on a two-level ruby maser operated both as a pulsed amplifier and as an oscillator at these wavelengths. When amplifying, values of gain and bandwidth of up to about 14 ds and 10 Mc/ s at 1-4° k were obtained, giving root gain-bandwidth products of up to about 50 Mc/ s. In preliminary experiments using the maser as an oscillator output powers of about 70 / z/ v at 33-1 Gc/ s were obtained at 1. 4° K. The inversion technique used, which incorporates magnetic field modulation with the use of the crystal as a cavity, could be readily scaled to considerably higher frequencies.An investigation of adiabatic rapid passage has been made in ruby at 8 mm wavelengths. Performance data are given on a two-level ruby maser operated both as a pulsed amplifier and as an oscillator at these wavelengths. When amplifying, values of gain and bandwidth of up to about 14 ds and 10 Mc/ s at 1-4° k were obtained, giving root gain-bandwidth products of up to about 50 Mc/ s. In preliminary experiments using the maser as an oscillator output powers of about 70 / z/ v at 33-1 Gc/ s were obtained at 1. 4° K. The inversion technique used, which incorporates magnetic field modulation with the use of the crystal as a cavity, could be readily scaled to considerably higher frequencies.

Journal of Electronics and ControlJan 1, 19614 citations

Oscillation Characteristics of a Pulsed Ruby Maser

Fujio Saito

Pulsed oscillation of a three-level ruby maser of which pumping microwave was modulated by pulse was investigated. The time lag td of the oscillation pulse behind the pumping pulse was determined experimentally as a function of the peak level P of the pumping power, and the period T and the width τ of the pumping pulse. A semi-empirical formula td=t0(\frac{P_{c}}{P})kexp [b(\frac{T}{\tau})1-δ\frac{P_{c}}{P}] was obtained. The minimum pulse width τm required for the oscillation to occur was determined as a function of P and T, which was approximately expressed by τm=c\frac{T^{m}}{P^{n}}. The above results were qualitatively interpreted in terms of excess population Δn,Pulsed oscillation of a three-level ruby maser of which pumping microwave was modulated by pulse was investigated. The time lag td of the oscillation pulse behind the pumping pulse was determined experimentally as a function of the peak level P of the pumping power, and the period T and the width τ of the pumping pulse. A semi-empirical formula td=t0(\frac{P_{c}}{P})kexp [b(\frac{T}{\tau})1-δ\frac{P_{c}}{P}] was obtained. The minimum pulse width τm required for the oscillation to occur was determined as a function of P and T, which was approximately expressed by τm=c\frac{T^{m}}{P^{n}}. The above results were qualitatively interpreted in terms of excess population Δn,

Japanese Journal of Applied PhysicsJul 1, 19640 citations

Ruby as a Maser Material

Chihiro Kikuchi, John Lambe, George Makhov +1 more

The reasons for the initial choice of ruby as a maser material are outlined and some measurements of the parameters in the spin Hamiltonian and of spin relaxation times are reported. The relative merits of single- and double-pump modes of operation of a four-level maser are discussed and measurements of the oscillator power for the two cases are included.

Journal of Applied PhysicsJul 1, 195964 citations

The pulsed ruby maser as a light amplifier

David A. Berkowitz, W.S. Boyle

Proceedings of the IEEEDec 1, 19654 citations

The Pulsed Ruby Maser as a Light Amplifier

Abstract

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The Pulsed Ruby Maser as a Light Amplifier

Abstract

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