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

International Topical Meeting on Microwave Photonics

Negative light-modulation phenomenon in Er-doped YAG crystal using a modulated laser diode

Yoshinobu Maeda, M. Migitaka

Published Dec 24, 2002• 0 citations
Publisher

Abstract

Dependence of the negative nonlinear absorption effect on both the sample length and the modulation frequency of the incident laser were investigated in an erbium doped yttrium aluminum garnet crystal. Negative light-modulation phenomenon was observed at 100 MHz.
DOI
10.1109/mwp.1996.662090

Related papers

Modulation Characteristics of the Negative Nonlinear Absorption Effect in Erbium-Yttrium Aluminum Garnet

Yoshinobu Maeda, Masatoshi Migitaka

Dependence of the negative nonlinear absorption effect on both modulation degree and frequency was investigated in erbium yttrium aluminum garnet crystals. For a modulation frequency of 1 MHz, two peaks, A and B, were observed in the transmitted waveform. With a decreasing modulation degree, peak C which consists of peaks A and B appeared and a reversed-phase waveform was obtained in the transmitted waveform. Peak A decreased as the modulation frequency increased, and peak B was only observed for modulation frequencies above 50 MHz. In the case of a modulation degree under 35%, the transmitted waveform changed to the opposite phase of incident one for modulation frequencies up to 100 MHz. In addition, the negative nonlinear absorption effect was dependent on the product of the composition of erbium and the sample length. It was suggested that the enhanced absorption was due to stimulated emission in three excited states of Er3+.

Japanese Journal of Applied Physics•Aug 1, 1997•6 citations

Optical Signal Inverter Derived from Negative Nonlinear Absorption Effects

Yoshinobu Maeda, Seiichi Ikeda Seiichi Ikeda, Masatoshi Migitaka

Using a modulated laser diode, dependence of a negative nonlinear absorption effect on both the wavelength and the sample length was observed in an erbium doped yttrium aluminum garnet crystal which has a four-level energy structure. The effect was seen at wavelengths of 787.4 to 788.6 nm in excited state absorption spectra which showed a peak corresponding to the transition from 4 I 13/2 to 2 H 11/2 in Er3+ for sample lengths greater than 2.0 mm. An optical signal inverter which had a negative input-output characteristic was realized using the negative nonlinear absorption effect.

Japanese Journal of Applied Physics•Jul 1, 1996•23 citations

All-optical inverter derived from negative nonlinear absorption effect

Toshikazu Yamada, Yoshinobu Maeda

Dependence of the negative nonlinear absorption effect (NNA effect) on modulation frequency was investigated in an erbium-doped lutetium aluminum garnet (Er:LuAG) crystal at the wavelength of 787.8 nm. When the intensity of the incident laser irradiated on Er:LuAG and Er:YAG crystals was wavy, those crystals were observed NNA effect that the transmitted laser intensity shows opposite phase of the incident laser at the wavelength of about 788 nm. The transmitted waveforms changed to the opposite phase of the incident waveform for modulation frequencies up to 1 GHz. For 1 GHz, the peak of the reversed-phase waveform was shifted by approximately 250 ps.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Sep 20, 1999•0 citations

Dependence of the negative nonlinear absorption effect on both modulation frequency and temperature in Er3+:YAG crystals

Yoshinobu Maeda, Masatoshi Migitaka

Dependence of the negative nonlinear absorption effect on both modulation frequency and sample temperature was investigated in an erbium yttrium aluminum garnet crystal. The phase of transmitted laser was opposite to that of the incident laser at modulation frequencies lower than 1 MHz. However, the transmitted laser waveform was asymmetrical above 5 MHz and the time-dependence characteristics agreed with the lifetime of the 4S3/2 level in Er3+. At temperatures lower than 25 K, enhanced absorption was weakened because the number of phonons decreased due to low temperature. It is suggested that the negative nonlinear absorption effect occurred due to enhanced absorption in three excited states. © 1998 Scripta Technica. Electron Comm Jpn Pt 2, 80(6): 43–48, 1997

Electronics and Communications in Japan (Part II Electronics)•Jun 1, 1997•0 citations

Optical Signal Inverter Phenomena using Negative Nonlinear Absorption Effect

Yoshinobu Maeda, Seiichi Ikeda, Takao Sakakibara +1 more

A negative input-output characteristic was obtained in an erbium doped yttrium aluminum garnet crystal which has multiple-level energy structure: absorption can occur between a ground level and an excited level (4I15/2-4I9/2) and between two other excited levels (4I13/2-2H11/2) in Er3+. It was caused at the wavelength between 786.6 and 788.4nm by the variation of incident laser intensity in the intensity range of 60 nW/cm2 to 100 W/cm2. It is considered that an enhanced absorption occurs due to the excited state absorption from 4I13/2 to 2H11/2. Because its spectra match the wavelength dependence of the incident laser. In addition, optical signal inverter phenomenon was observed using a laser diode modulated with 10 MHz. By considering multiple excited state absorption in detail, active functions such as an optical signal inverter could be derived from the negative nonlinear absorption effect.

IEEJ Transactions on Electronics Information and Systems•Jan 1, 1997•3 citations

Modulation Characteristics of 1.53 µm Optical Inverter in Erbium-Lutetium Aluminum Garnets

Yoshinobu Maeda

An all-optical inverter derived from the negative nonlinear absorption effect was demonstrated in erbium-lutetium aluminum garnet crystals using 1532 nm laser diode. By decreasing incident modulation degree, a reversed-phase waveform was obtained in the transmitted laser at modulation degrees smaller than 90% for sample lengths greater than 1.0 mm. The reversed-phase transmitted waveforms were observed at modulation frequencies from 100 kHz to 1 GHz.

Japanese Journal of Applied Physics•Aug 1, 1999•0 citations
Dependence of the negative nonlinear absorption effect on both modulation degree and frequency was investigated in erbium yttrium aluminum garnet crystals. For a modulation frequency of 1 MHz, two peaks, A and B, were observed in the transmitted waveform. With a decreasing modulation degree, peak C which consists of peaks A and B appeared and a reversed-phase waveform was obtained in the transmitted waveform. Peak A decreased as the modulation frequency increased, and peak B was only observed for modulation frequencies above 50 MHz. In the case of a modulation degree under 35%, the transmitted waveform changed to the opposite phase of incident one for modulation frequencies up to 100 MHz. In addition, the negative nonlinear absorption effect was dependent on the product of the composition of erbium and the sample length. It was suggested that the enhanced absorption was due to stimulated emission in three excited states of Er3+.
Using a modulated laser diode, dependence of a negative nonlinear absorption effect on both the wavelength and the sample length was observed in an erbium doped yttrium aluminum garnet crystal which has a four-level energy structure. The effect was seen at wavelengths of 787.4 to 788.6 nm in excited state absorption spectra which showed a peak corresponding to the transition from 4 I 13/2 to 2 H 11/2 in Er3+ for sample lengths greater than 2.0 mm. An optical signal inverter which had a negative input-output characteristic was realized using the negative nonlinear absorption effect.
Dependence of the negative nonlinear absorption effect (NNA effect) on modulation frequency was investigated in an erbium-doped lutetium aluminum garnet (Er:LuAG) crystal at the wavelength of 787.8 nm. When the intensity of the incident laser irradiated on Er:LuAG and Er:YAG crystals was wavy, those crystals were observed NNA effect that the transmitted laser intensity shows opposite phase of the incident laser at the wavelength of about 788 nm. The transmitted waveforms changed to the opposite phase of the incident waveform for modulation frequencies up to 1 GHz. For 1 GHz, the peak of the reversed-phase waveform was shifted by approximately 250 ps.
Dependence of the negative nonlinear absorption effect on both modulation frequency and sample temperature was investigated in an erbium yttrium aluminum garnet crystal. The phase of transmitted laser was opposite to that of the incident laser at modulation frequencies lower than 1 MHz. However, the transmitted laser waveform was asymmetrical above 5 MHz and the time-dependence characteristics agreed with the lifetime of the 4S3/2 level in Er3+. At temperatures lower than 25 K, enhanced absorption was weakened because the number of phonons decreased due to low temperature. It is suggested that the negative nonlinear absorption effect occurred due to enhanced absorption in three excited states. © 1998 Scripta Technica. Electron Comm Jpn Pt 2, 80(6): 43–48, 1997
A negative input-output characteristic was obtained in an erbium doped yttrium aluminum garnet crystal which has multiple-level energy structure: absorption can occur between a ground level and an excited level (4I15/2-4I9/2) and between two other excited levels (4I13/2-2H11/2) in Er3+. It was caused at the wavelength between 786.6 and 788.4nm by the variation of incident laser intensity in the intensity range of 60 nW/cm2 to 100 W/cm2. It is considered that an enhanced absorption occurs due to the excited state absorption from 4I13/2 to 2H11/2. Because its spectra match the wavelength dependence of the incident laser. In addition, optical signal inverter phenomenon was observed using a laser diode modulated with 10 MHz. By considering multiple excited state absorption in detail, active functions such as an optical signal inverter could be derived from the negative nonlinear absorption effect.