Self-induced transparency and coherent population trapping of ^87Rb vapor in a mode-locked laser

Masuda, Koji; Affolderbach, C.; Mileti, G.; Diels, Jean‐Claude; Arissian, Ladan

doi:10.1364/ol.40.002146

Cited by 9 publications

(9 citation statements)

References 20 publications

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“…On the one hand, we can obtain the pulse duration from the intensity oscillograms or, when the duration is less than the resolution of the oscillograph, using an autocorrelator and a scanning Fabry-Perot interferometer. On the other hand, the duration of a 2π pulse can be estimated independently from the measured output power as the following: The Rabi period 𝑇 𝑅𝑎𝑏𝑖 = 2𝜋 𝛺 𝑅𝑎𝑏𝑖 and Rabi frequency 𝛺 𝑅𝑎𝑏𝑖 = 𝑑 12 𝐸 ℏ (here E is the peak field strength; the values of d12 for Rb are given in [18]) can be related to the output power Pout via the expression: 𝐸(𝐸𝑆𝑈) = 27 √𝑊 ( 𝑊 𝑐𝑚 2 ) 300 ⁄ . The peak intensity is given by: 𝑊 =…”

Section: Resultsmentioning

confidence: 99%

“…In that work the SIT pulses were indeed obtained in a Rb cell, however they were not the cause of mode-locking. In contrast, an opposite effect was observed: as the pump wavelength of the already mode-locked laser were tuned to the Rb resonance using an intacavity spectral filter, increasing of the pulse duration, decrease of the mode-locking stability and increasing of the repetition rate were observed in [18]. In our previous experiments, we observed mode-locking in a cw dye laser with a coherent absorber (cells with molecular iodine vapor) [19].…”

Section: Introductionmentioning

confidence: 90%

“…Up to now, any attempt to obtain mode-locking with SIT effects (2π pulses in absorber) and to show the absence of the usual pulse duration limits in the SIT case were unsuccessful. One should however mention the recent work [18] were a passive mode-locking in Ti:Sa laser with an intracavity Rb-87 cell was achieved using a semiconductor saturable absorbing mirror (SESAM). In that work the SIT pulses were indeed obtained in a Rb cell, however they were not the cause of mode-locking.…”

Section: Introductionmentioning

confidence: 99%

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Self-induced-transparency mode locking in a Ti:sapphire laser with an intracavity rubidium cell

et al. 2020

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In a Ti:Sa laser with an absorbing with Rb vapor cell stable self-starting passive mode-locking is demonstrated. We show that the mode-locking appears due to self-induced transparency (SIT) in the Rb cell, that is, the pulse in the Rb cell is a 2pi SIT pulse. For the best of our knowledge, in these experiments we present the first time demonstration of SIT mode-locking in laser systems, which was discussed only theoretical before.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Self-induced-transparency mode locking in a Ti:sapphire laser with an intracavity rubidium cell

et al. 2020

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“…In particular, they were observed in single-section gas lasers [16], quantum dot amplifiers [17] and quantum cascade lasers in the THz frequency range [18]. Furthermore, in the recent paper [19], the signatures of SIT regime in a rubidium 78 Rb gas cell placed in a cavity of a mode-locked laser were demonstrated experimentally. However, the SIT regime in [19] was not related to the mode-locking.…”

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confidence: 99%

Mode-locking based on zero-area pulse formation in a laser with a coherent absorber

et al. 2018

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We observe experimentally a mode-locking in a continuous narrow-band tunable dye laser with molecular iodine absorber cells, which transitions have large phase relaxation time T2. We show that the modelocking arises due to coherent interaction of light with the absorbing medium leading to Rabi oscillations, so that zero-area (0π-) pulses in the absorber are formed. Such mode-locking regime is different to most typical passive modelocking mechanisms where saturation plays the main role. ______________________________________________________________Mode locked (ML) lasers are principal sources of short light pulses with a high repetition rate [1,2]. The most commonly used method to create such pulses inside a cavity is a passive modelocking. Typically such lasers consist of two sections, one with a gain medium and the other with a nonlinearly absorbing one. The physical mechanism of mode-locking in such lasers is based on the effect of saturation of absorption in the absorber section as well as the saturation of the gain in the amplifier.Recently, another mechanism of passive mode-locking was proposed, where the absorber and gain media operate not in the regime of saturation but in the coherent regime of strong coupling of light with the medium [3-10]. Coherent light-matter interaction regime arises when light pulse duration is smaller than medium polarization relaxation time T2 [11][12][13]. The presence of phase memory leads to the novel unusual phenomena in the propagation of the pulse in nonlinear absorbing or amplifying media, which cannot be observed when the regime of light-matter interaction is incoherent . For example, pulse can propagates without losses in the regime of self-induced transparency (SIT) in the absorber as a 2π pulse [11]. In the amplifying medium stable π pulse can exist [12]. The key idea of the mode-locking based on the coherent effects is to use a configuration allowing the same pulse to be a 2π-pulse in the absorber and π-pulse in the amplifier [3][4][5][6][7][8][9][10]. In this way, since a 2π-pulse is a stable soliton solution, absorber dumps any background perturbations making the regime stable. At the same time, a π-pulse configuration in the amplifier allows to take the energy from it, thus leading to a pulse shortening.Despite of the great potential promising to deliver pulses up to single-cycle duration [6,7], lasers with such coherent modelocking mechanism have not been realized experimentally yet. One of the problems is to obtain coherent interaction inside the cavity for the parameters required for the mode-locking. Although coherent effects were observed in plenty of optical systems [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], achieving intra-cavity coherent effects combined with a modelocking is not a trivial task. In particular, they were observed in single-section gas lasers [16], quantum dot amplifiers [17] and quantum cascade lasers in the THz frequency range [18]. Furthermore, in the recent paper [19], the signatures of SIT regime in a rubidium 78 R...

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“…In indirect evidence for Rabi oscillations, McCall and Hahn reported the first observation of self-induced transparency (SIT) by a coherent laser pulse in ruby ∼50 years ago [1][2][3]. The first report of this remarkable phenomenon led to a wide range of experimental investigations in atomic and molecular gases, metal vapors and transition metal ion and rare-earth-iondoped crystals, glasses, and fibers [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Numerous theoretical elaborations were also reported [20][21][22][23][24][25][26].…”

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confidence: 99%

Ultra-slow light propagation by self-induced transparency in ruby in the superhyperfine limit

et al. 2017

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Self-induced transparency is reported for circularly polarized light in the R₁(-3/2) line of a 30 ppm ruby (α-Al₂O₃:Cr³⁺) at 1.7 K in a magnetic field of B‖c=4.5 T. In such a field and temperature, a 30 ppm ruby is in the so-called superhyperfine limit resulting in a long phase memory time, T_M=50 μs, and a thousand-fold slower pulse propagation velocity of ∼300 m/s was observed, compared to the ∼300 km/s measured in the first observation of self-induced transparency (SIT) ∼50 years ago, that employed a ruby with a 500 ppm chromium concentration in zero field and at 4.2 K. To date, this is the slowest pulse propagation ever observed in a SIT experiment.

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Self-induced transparency and coherent population trapping of ^87Rb vapor in a mode-locked laser

Cited by 9 publications

References 20 publications

Self-induced-transparency mode locking in a Ti:sapphire laser with an intracavity rubidium cell

Self-induced-transparency mode locking in a Ti:sapphire laser with an intracavity rubidium cell

Mode-locking based on zero-area pulse formation in a laser with a coherent absorber

Ultra-slow light propagation by self-induced transparency in ruby in the superhyperfine limit

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