The Mauna Kea Observatories Near‐Infrared Filter Set. I. Defining Optimal 1–5 Micron Bandpasses

Simons, Douglas A.; Tokunaga, A. T.

doi:10.1086/338544

Cited by 192 publications

(48 citation statements)

References 19 publications

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“…The near through mid-IR wavelengths chosen (e = 1250 nm, 1650 nm, 2200 nm, 2400 nm) are within the transparency windows of air [20]. We find that the nonlinear response is quite dispersionless over the range of wavelengths investigated, except near e=400 nm, consistent with a simple model for the third-order nonlinear susceptibility developed by Bishop [21].…”

supporting

confidence: 82%

Measurement of the Nonlinear Refractive Index of Air Constituents at Mid-Infrared Wavelengths

Zahedpour

Wahlstr

Milchberg

2016

High-Brightness Sources and Light-Driven Interactions

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We measure the nonlinear refractive index coefficients in N 2 , O 2 and Ar from visible through mid-infrared wavelengths ( = 0.4  2.4 µm). The wavelengths investigated correspond to transparency windows in the atmosphere. Good agreement is found with theoretical models of  (3) . Our results are essential for accurately simulating the propagation of ultrashort mid-IR pulses in the atmosphere.Filamentary propagation of intense ultrashort laser pulses in atmosphere for < ~1 m has been a subject of extensive study [1,2], finding applications in the generation of terahertz radiation [3], high harmonic generation [4], air lasing [5][6][7], and remote inscription of optical waveguides into air [813]. It has been anticipated that new regimes of laser filamentation are possible at longer wavelengths, such as in the midinfrared (mid-IR,  ~ 1.5-10 m), where beam collapse arrest may occur through harmonic walk-off rather than plasma-induced refraction [14]. Mid-IR filamentation is effective for generating coherent keV-level photon beams in high pressure gas-filled capillaries [15] and broad mid-IR supercontinua in high pressure gas volumes [16].Accurate values for nonlinear coefficients are essential for high fidelity simulations of intense laser propagation [17]-such simulations are indispensable not only for designing experiments and informing applications, but they also motivate the design and parameters of the lasers themselves. We recently showed that in the near-infrared (pump wavelength e = 0.8 µm), air propagation simulations depend very sensitively on the values used for the coefficients (n2) describing the instantaneous electronic nonlinear response of air constituents [18]. Best agreement of the simulations with axially resolved measurements occurs for n2 coefficients measured in [19].In this Article, we present measurements of n2 for the air constituents N2, O2 and Ar at pump wavelengths ranging from 400 nm to 2400 nm. The near through mid-IR wavelengths chosen (e = 1250 nm, 1650 nm, 2200 nm, 2400 nm) are within the transparency windows of air [20]. We find that the nonlinear response is quite dispersionless over the range of wavelengths investigated, except near e=400 nm, consistent with a simple model for the third-order nonlinear susceptibility developed by Bishop [21].The experimental setup is shown in Fig 1. Pulses from a 1 kHz Ti:Sapphire regenerative amplifier centered at 800 nm are split, with 2.8 mJ pumping an optical parametric amplifier (OPA) [22], which is tunable from 1100 nm to 2600 nm. A chopper reduces the pulse repetition rate to 500 Hz. The remaining portion of the 800 nm pulse is attenuated and weakly focused in a 2 atm xenon gas cell, where filamentation generates a =500700 nm broadband supercontinuum (SC) transmitted through the pump-rejecting dichroic splitter. A Michelson interferometer splits the SC into two collinear pulses (reference and probe) temporally separated by 2 ps. The dispersive glass in the SC beam path introduces equal positive chirp to ~1.5 ps on the reference ...

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supporting

confidence: 82%

Measurement of the Nonlinear Refractive Index of Air Constituents at Mid-Infrared Wavelengths

Zahedpour

Wahlstr

Milchberg

2016

High-Brightness Sources and Light-Driven Interactions

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“…We calibrated the photometric measurements with respect to those of 27 (J) and 23 (H) nearby stars with magnitudes 0.2-2.0 mag brighter than those of HD 203030B and with precise photometry (±0.02-0.06 mag) from 2MASS (Skrutskie et al 2006). We converted the 2MASS magnitudes of these calibration stars to the MKO system (Simons & Tokunaga 2002) following the relations given in Hodgkin et al (2009), and fit first-order polynomials between the instrumental and MKO magnitudes of the calibrators. Finally we used these fits to calibrate the magnitude of HD 203030B.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

The Prototypical Young L/T-Transition Dwarf HD 203030B Likely Has Planetary Mass

Miles-Páez¹,

Metchev²,

Luhman³

et al. 2017

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Upon its discovery in 2006, the young L7.5 companion to the solar analog HD 203030 was found to be unusual in being ≈200 K cooler than older late-L dwarfs. HD 203030B offered the first clear indication that the effective temperature at the L-to-T spectral type transition depends on surface gravity: now a well-known characteristic of low-gravity ultra-cool dwarfs. An initial age analysis of the G8V primary star indicated that the system was 130-400 Myr old, and so the companion between 12-31 M Jup . Using moderate resolution near-infrared spectra of HD 203030B, we now find features of very low gravity comparable to those of 10-150 Myr-old L7-L8 dwarfs. We also obtained more accurate near infrared and Spitzer/IRAC photometry, and find a (J − K) MKO color of 2.56 ± 0.13 mag-comparable to those observed in other young planetary-mass objects-and a luminosity of log(L bol /L ) = −4.75 ± 0.04 dex. We further reassess the evidence for the young age of the host star, HD 203030, with a more comprehensive analysis of the photometry and updated stellar activity measurements and age calibrations. Summarizing the age diagnostics for both components of the binary, we adopt an age of 100 Myr for HD 203030B and an age range of 30-150 Myr. Using cloudy evolutionary models, the new companion age range and luminosity result in a mass of 11 M Jup with a range of 8-15 M Jup , and an effective temperature of 1040 ± 50 K.

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“…The NICI filters are on the Mauna Kea Observatories photometric system (Simons & Tokunaga 2002;Tokunaga & Vacca 2005). We acquired 10 60-s frames in each filter with the rotator on.…”

Section: 22" Mask Jhks Observationsmentioning

confidence: 99%

THE GEMINI NICI PLANET-FINDING CAMPAIGN: DISCOVERY OF A CLOSE SUBSTELLAR COMPANION TO THE YOUNG DEBRIS DISK STAR PZ Tel

Biller

Liu

Wahhaj

et al. 2010

ApJ

131

118

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We report the discovery of a tight substellar companion to the young solar analog PZ Tel, a member of the β Pic moving group observed with high contrast adaptive optics imaging as part of the Gemini NICI Planet-Finding Campaign. The companion Myr for the system, we estimate a mass of 36±6 M Jup based on the Lyon/DUSTY evolutionary models. PZ Tel B is one of few young substellar companions directly imaged at orbital separations similar to those of giant planets in our own solar system. Additionally, the primary star PZ Tel A shows a 70 µm emission excess, evidence for a significant quantity of circumstellar dust that has not been disrupted by the orbital motion of the companion.Subject headings: brown dwarfs -planetary systems -stars: pre-main sequence

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The Mauna Kea Observatories Near‐Infrared Filter Set. I. Defining Optimal 1–5 Micron Bandpasses

Cited by 192 publications

References 19 publications

Measurement of the Nonlinear Refractive Index of Air Constituents at Mid-Infrared Wavelengths

Measurement of the Nonlinear Refractive Index of Air Constituents at Mid-Infrared Wavelengths

The Prototypical Young L/T-Transition Dwarf HD 203030B Likely Has Planetary Mass

THE GEMINI NICI PLANET-FINDING CAMPAIGN: DISCOVERY OF A CLOSE SUBSTELLAR COMPANION TO THE YOUNG DEBRIS DISK STAR PZ Tel

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