Tapered semiconductor amplifiers for optical frequency combs in the near infrared

Cruz, Flávio C.; Stowe, Matthew C.; Ye, Jun

doi:10.1364/ol.31.001337

Cited by 29 publications

(16 citation statements)

References 16 publications

(22 reference statements)

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“…A high power output around 670nm has been obtained with an external coupling cavity [6,7]. And a tapered amplifier has been injection seeded with a femtosecond comb [8].To get a high-power multi-mode output, multiple frequency components can be simultaneously amplified in a tapered amplifier to simplify the experimental setup. But at the same time, the wave-mixing process can result in a multiple side-band generation, which may have nonnegligible effects on atomic behaviors.…”

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Multiple side-band generation for two-frequency components injected into a tapered amplifier

Luo

Zhang

et al. 2013

Opt. Lett.

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We have experimentally studied the multiple side-band generation for two-frequency components injected into a tapered amplifier and demonstrated its effects on atomic laser cooling. A heterodyne frequency-beat measurement and a Fabry Perot interferometer have been applied to analyze the side-band generation with different experimental parameters, such as frequency difference, injection laser power and tapered amplifier current. In laser cooling potassium40 and potassium41 with hyperfine splitting of 1.3GHz and 254MHz, respectively, the side-band generation with a small frequency difference has a significant effect on the number of trapped atoms.c 2018 Optical Society of America OCIS codes: 140.3520, 140.4480, 190.4223, 020.3320 Multiple side bands with an equal frequency spacing have various applications in quantum optics and laser cooling. Zhu et. al. observed the multiple-mode sideband fluorescence around the resonant transition with a strong dichromatic field coupling two energy levels [1]. Multiple electromagnetic induced transparencies [2] and four-wave mixing have been observed with two coupling components and one probing component in a three-level system [3]. And an arbitrary side-band with squeezing has been demonstrated in the experiment [4]. In laser cooling of alkali atoms, two frequency components are required, one for optical pumping and the other for cooling. The semiconductor laser has become a standard tool in laser cooling due to its easy operation and low price. But its low output power (generally less than 100mW) puts a limit on the number of trapped atoms. The output power of a tapered amplifier can be very high (generally more than 500mW), which enables us to improve the parameters of trapped atoms. Different spectra have been achieved on the base of a tapered amplifier. For example, two-frequency components can be simultaneously injected into a tapered amplifier [5]. A high power output around 670nm has been obtained with an external coupling cavity [6,7]. And a tapered amplifier has been injection seeded with a femtosecond comb [8].To get a high-power multi-mode output, multiple frequency components can be simultaneously amplified in a tapered amplifier to simplify the experimental setup. But at the same time, the wave-mixing process can result in a multiple side-band generation, which may have nonnegligible effects on atomic behaviors. Here, we will use a heterodyne frequency-beat measurement with a high resolution (<500kHz) and a FPI (Fabry Perot interferometer) to analyze the side-band generation when twofrequency components are injected into a tapered amplifier. Laser cooling potassium40 and potassium41 with different hyperfine splitting can demonstrate the effect of the side-band generation on the interaction between atoms and light.Our experimental setup is shown in Fig.1. Each half wave plate (from HWP1 to HWP8) is used to rotate the laser polarization direction for adjusting the relative powers in the two outputs of its following PBS (polarization beam splitter). The output of ...

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“…A high power output around 670nm has been obtained with an external coupling cavity [6,7]. And a tapered amplifier has been injection seeded with a femtosecond comb [8].…”

mentioning

confidence: 99%

Multiple side-band generation for two-frequency components injected into a tapered amplifier

Luo

Zhang

et al. 2013

Opt. Lett.

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“…Here we work with a forbidden intercombination transition in cold neutral calcium (Ca) and resolve features as narrow as 1.2 kHz. In order compensate for the relatively high residual temperatures of our atoms,we amplifying the teeth centered at the transition wavelength in a laser diode [14]. Additionally, we demonstrate the comb's wavelength versatility by stabilizing the comb relative to a high-finesse cavity at 534 nm, but perform high-resolution spectroscopy at 657 nm.…”

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confidence: 99%

Kilohertz-Resolution Spectroscopy of Cold Atoms with an Optical Frequency Comb

et al. 2006

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We have performed sub-Doppler spectroscopy on the narrow intercombination line of cold calcium atoms using the amplified output of a femtosecond laser frequency comb. Injection locking of a 657-nm diode laser with a femtosecond comb allows for two regimes of amplification, one in which many lines of the comb are amplified, and one where a single line is predominantly amplified. The output of the laser in both regimes was used to perform kilohertz-level spectroscopy. This experiment demonstrates the potential for high-resolution absolute-frequency spectroscopy over the entire spectrum of the frequency comb output using a single high-finesse optical reference cavity. PACS numbers: Valid PACS appear hereThe coherent optical bandwidth provided from frequency combs based on modelocked femtosecond lasers provide the optical-to-microwave division necessary to directly count optical frequencies, which has lead to significant advances in optical frequency measurement [1,2]. With the development of ultra-broadband titaniumdoped sapphire (Ti:S) lasers [3,4,5] and the coherent broadening possible with nonlinear optical fibers,[6] the optical bandwidth of comb generators extends from near infrared into visible frequencies. The subsequent stabilization of such frequency combs allows for absolute optical measurements over hundreds of terahertz making them an ideal tool for spectroscopy. Already, frequency combs have been used for direct spectroscopy of allowed two-photon and one-photon transitions [7,8,9,10,11,12]. Previous measurements with the direct output of a frequency comb have been performed by stabilization of the comb to microwave references and studying transitions with megahertz linewidths. A greater potential can be realized by transferring the stability of a narrow optical reference to the comb.A new paradigm is attained by combining the extremely precise optical synthesis of the comb with cold atomic samples that allow long interaction times and permit for nonlinear spectroscopy of very narrow optical transitions with low optical powers. Here we work with a forbidden intercombination transition in cold neutral calcium (Ca) and resolve features as narrow as 1.2 kHz. In order compensate for the relatively high residual temperatures of our atoms,we amplifying the teeth centered at the transition wavelength in a laser diode [14]. Additionally, we demonstrate the comb's wavelength versatility by stabilizing the comb relative to a high-finesse cavity at 534 nm, but perform high-resolution spectroscopy at 657 nm. The application of direct optical measurements with an optical frequency comb to optical clocks that rely on both very cold atoms and optical frequency combs. Direct spectroscopy with an optical comb could potentially yield access to transition frequencies that would be difficult to reach otherwise.The laser that is used in the experiments is a ring cav-Experimental depiction for high-precision optical spectroscopy of cold Ca atoms using a femtosecond laser frequency comb. Acousto-optic modulators (AOM) switch ...

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“…Semiconductor optical amplifiers (SOAs) have been actively studied for more than two decades and still draw great attention due to their wide applications and potential in optical communication and photonic integration [1][2][3][4]. EDFA-comparable high-performance SOA modules were achieved in laboratory [5,6] a few years ago, but hardly used for commercial applications.…”

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confidence: 99%

Gain properties and optical-feedback suppression of asymmetrical curved active waveguides

Duan

Shi

et al. 2009

Front. Optoelectron. China

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Elaborately-designed asymmetrical curved active waveguides are introduced to improve the gain properties of semiconductor optical amplifiers (SOAs) by internal distributed optical-feedback suppression. An analytical model of the double-energy-level system is utilized in the simulation and designed by the finite difference time domain (FDTD) method. Under a 280 mA driving current, the optimized curved SOA with the simple device structure without isolators performs a more than 18 dB fiber-to-fiber gain, 980 mW spontaneous emission power, and 13 dBm saturation power.

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Tapered semiconductor amplifiers for optical frequency combs in the near infrared

Cited by 29 publications

References 16 publications

Multiple side-band generation for two-frequency components injected into a tapered amplifier

Multiple side-band generation for two-frequency components injected into a tapered amplifier

Kilohertz-Resolution Spectroscopy of Cold Atoms with an Optical Frequency Comb

Gain properties and optical-feedback suppression of asymmetrical curved active waveguides

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