Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

High Resolution Spectroscopy of Solids Using an Amplitude Squeezed Diode Laser

Y Fukuda, Akira Mashimo, Takako Muramoto

Published Mar 20, 1995• 0 citations
OpenAlex

Abstract

High resolution spectroscopy using an FM noise of an amplitude squeezed diode laser is applied to a solid state sample for the first time. The ruby R1 lines are examined and the observed line width of the R1 line;-1/2(4A2)～-1/2(E) is 30 MHz(HWHM), which is limited by the short time laser width. The width of the ruby R2 line 1/2(4A2)～-1/2(A) is wider than 125MHz MH, which is restricted within the band widths of the optical detecter and the amplifier.

Related papers

Frequency-modulation spectroscopy of rubidium atoms with an AlGaAs diode laser

Shunsuke Nakanishi, H. Ariki, Hiroshi Itoh +1 more

Frequency-modulation (FM) spectroscopy has been performed on the D(2) transitions of rubidium atoms with an AlGaAs diode laser at 780 nm. Doppler-broadened hyperfine-structure transitions of (85)Rb and (87)Rb were resolved with no residual amplitude-modulation-induced background signal by modulating the injection current of the laser diode at a low frequency (20-50 MHz) compared with the Doppler width. To obtain Doppler-free spectra, we combined FM spectroscopy with saturation spectroscopy. The results show that the FM spectroscopy technique is sensitive and should be useful for high-resolution spectroscopy, although the resolution was instrument limited and unusual double peaks were observed.

Optics Letters•Nov 1, 1987•10 citations

Rubidium spectroscopy at 778–780 nm with a distributed feedback laser diode

Sebastian Kraft, Anselm J. Deninger, Christian Trück +3 more

We have performed high resolution spectroscopy of rubidium with a single mode continuous wave distributed feedback (DFB) laser diode. The saturation spectrum of the D 2 -line of 85 Rb and 87 Rb was recorded with a resolution close to the natural line width. The emission frequency was actively stabilized to Doppler-free transitions with a relative accuracy of better than 7 parts in 10 9 using commercially available servo devices only. An output power of 80 mW was sufficient to allow for two-photon spectroscopy of the 5S-5D-transition of 87 Rb. Further, we report on the spectral properties of the DFB diode, its tuning range and its frequency modulation properties. The line width of the diode laser, determined with high resolution Doppler free two photon spectroscopy, was 4 MHz without applying any active stabilization techniques. For time scales below 5 μs the line width drops below 2 MHz.

arXiv:physics/0410256•Laser Physics Letters•Nov 3, 2004•37 citations

Amplitude-squeezed, frequency-modulated, tunable, diode-laser-based source for sub-shot-noise FM spectroscopy

Steven Kasapi, Seema Lathi, Y. Yamamoto

We have developed a frequency-modulated, tunable, amplitude-squeezed, diode-laser-based source and used it to perform FM spectroscopy on rubidium. The setup consists of a free-running diode laser injection locked by a frequency-stabilized, current-modulated diode laser. The injection-locked slave laser beam adopted the frequency spectrum of the master laser beam while rejecting residual AM in the master laser beam by more than 50 dB. Injection locking also enhanced amplitude squeezing in the slave laser beam by suppressing uncorrelated longitudinal sidemodes. The noise floor of the measurement was 0.8 dB below the shot-noise level.

Optics Letters•Apr 1, 1997•49 citations

High resolution time and frequency domain spectroscopy of solid state laser materials

A. Szabó

Frequency and time domain techniques of homogeneous laser spectroscopy of ions in solids are reviewed. Applications in three areas of current interest in our lab are described. These are: resonant energy transfer in ruby, strain characterization of crystals and the possible application of optical hole burning of inhomogeneously broadened lines in solids to a high capacity optical memory.

lase•Jan 1, 1981•0 citations

Spectroscopy with diode laser noise

M. Rosenbluh, Avia Rosenhouse‐Dantsker, A. D. Wilson‐Gordon +1 more

Summary form only given. Efficient conversion of laser frequency noise to amplitude noise takes place when a laser propagates through a resonant medium. This is demonstrated in the case of a solitary diode laser having the usual frequency or phase noise with a bandwidth of /spl sim/30 MHz but very low amplitude noise, propagating through a Doppler-broadened K vapor cell. The lineshape of the noise as a function of laser frequency near the K resonance has the characteristic M shape of FM spectroscopy. Measurements of the RF noise spectrum of the emergent beam in the case where the diode laser is near the 770 nm resonance of K reveals the ground state hyperfine structure of the K atoms at 460 MHz.

Quantum Electronics and Laser Science Conference•Jun 7, 1996•0 citations

Subshot noise FM spectroscopy with an amplitude-squeezed diode laser at room temperature

Steven Kasapi, Seema Lathi, Y. Yamamoto

We have developed a sub-shot-noise diode laser system and used it to perform sub-shot-noise FM spectroscopy. By inducing FM sidebands on a direct-current modulated external-cavity diode laser and injection locking a slave laser, we have suppressed the residual AM in the master by 50 dB and achieved a noise level of 0.8 dB below the shot-noise level. We expect that such techniques will provide useful and practical tools for future precision measurements and novel atom-photon interaction experiments.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Apr 26, 1995•1 citation
High resolution spectroscopy using an FM noise of an amplitude squeezed diode laser is applied to a solid state sample for the first time. The ruby R1 lines are examined and the observed line width of the R1 line;-1/2(4A2)～-1/2(E) is 30 MHz(HWHM), which is limited by the short time laser width. The width of the ruby R2 line 1/2(4A2)～-1/2(A) is wider than 125MHz MH, which is restricted within the band widths of the optical detecter and the amplifier.
Frequency-modulation (FM) spectroscopy has been performed on the D(2) transitions of rubidium atoms with an AlGaAs diode laser at 780 nm. Doppler-broadened hyperfine-structure transitions of (85)Rb and (87)Rb were resolved with no residual amplitude-modulation-induced background signal by modulating the injection current of the laser diode at a low frequency (20-50 MHz) compared with the Doppler width. To obtain Doppler-free spectra, we combined FM spectroscopy with saturation spectroscopy. The results show that the FM spectroscopy technique is sensitive and should be useful for high-resolution spectroscopy, although the resolution was instrument limited and unusual double peaks were observed.
We have performed high resolution spectroscopy of rubidium with a single mode continuous wave distributed feedback (DFB) laser diode. The saturation spectrum of the D 2 -line of 85 Rb and 87 Rb was recorded with a resolution close to the natural line width. The emission frequency was actively stabilized to Doppler-free transitions with a relative accuracy of better than 7 parts in 10 9 using commercially available servo devices only. An output power of 80 mW was sufficient to allow for two-photon spectroscopy of the 5S-5D-transition of 87 Rb. Further, we report on the spectral properties of the DFB diode, its tuning range and its frequency modulation properties. The line width of the diode laser, determined with high resolution Doppler free two photon spectroscopy, was 4 MHz without applying any active stabilization techniques. For time scales below 5 μs the line width drops below 2 MHz.
We have developed a frequency-modulated, tunable, amplitude-squeezed, diode-laser-based source and used it to perform FM spectroscopy on rubidium. The setup consists of a free-running diode laser injection locked by a frequency-stabilized, current-modulated diode laser. The injection-locked slave laser beam adopted the frequency spectrum of the master laser beam while rejecting residual AM in the master laser beam by more than 50 dB. Injection locking also enhanced amplitude squeezing in the slave laser beam by suppressing uncorrelated longitudinal sidemodes. The noise floor of the measurement was 0.8 dB below the shot-noise level.
Summary form only given. Efficient conversion of laser frequency noise to amplitude noise takes place when a laser propagates through a resonant medium. This is demonstrated in the case of a solitary diode laser having the usual frequency or phase noise with a bandwidth of /spl sim/30 MHz but very low amplitude noise, propagating through a Doppler-broadened K vapor cell. The lineshape of the noise as a function of laser frequency near the K resonance has the characteristic M shape of FM spectroscopy. Measurements of the RF noise spectrum of the emergent beam in the case where the diode laser is near the 770 nm resonance of K reveals the ground state hyperfine structure of the K atoms at 460 MHz.
We have developed a sub-shot-noise diode laser system and used it to perform sub-shot-noise FM spectroscopy. By inducing FM sidebands on a direct-current modulated external-cavity diode laser and injection locking a slave laser, we have suppressed the residual AM in the master by 50 dB and achieved a noise level of 0.8 dB below the shot-noise level. We expect that such techniques will provide useful and practical tools for future precision measurements and novel atom-photon interaction experiments.