Amplitude squeezing in a pump-noise-suppressed laser oscillator

Journal Article · Sat Nov 01 04:00:00 EST 1986 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.34.4025· OSTI ID:5033544

Yamamoto, Y; Machida, S; Nilsson, O

This paper clarifies the origins of the standard quantum limit for the amplitude noise of a laser-oscillator outgoing field. The amplitude noise within the cavity bandwidth, ..cap omega..less than or equal to..omega../Q, is ultimately caused by the pump amplitude fluctuation, while that above the cavity bandwidth, ..cap omega..greater than or equal to..omega../Q, is due to the field zero-point fluctuation. The uncertainty product of the amplitude- and phase-noise spectra at an extremely high pumping level is still larger than the Heisenberg minimum-uncertainty product because of the presence of nonstationary phase-diffusion noise. In this sense, an ordinary laser oscillator is not a quantum-limited device. This paper suggests that a laser oscillator can produce an amplitude-squeezed state in itself if the pump amplitude fluctuation is suppressed below the ordinary shot-noise level. The paper discusses possible schemes for suppressing pump fluctuation, commutator bracket preservation without pump fluctuation, and resulting amplitude and phase spectra. The similarity of and difference between a pump-noise-suppressed laser and a cavity degenerate parametric amplifier are delineated.

• Research Organization: Electrical Communication Laboratories, Nippon Telegraph and Telephone Corporation, Musashinoshi, Tokyo 180, Japan
• OSTI ID: 5033544
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 34:5; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLITUDES
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUCTUATIONS
LASERS
NOISE
OPTICAL PUMPING
OSCILLATORS
PUMPING
QUANTUM ELECTRONICS
VARIATIONS