Demonstration of a HeNe/CH_4-based optical molecular clock

Foreman, Seth M.; Marian, Adela; Ye, Jun; Petrukhin, Evgeny A.; Gubin, M. A.; Mücke, Oliver D.; Wong, Franco N. C.; Ippen, Erich P.; Kärtner, Franz X.

doi:10.1364/ol.30.000570

Cited by 67 publications

(46 citation statements)

References 14 publications

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“….50k- Note that, because the infrared light at 2gm is created by difference-frequency generation, the seed pulses for the OPCPA automatically possess a stable CE phase. [ 12,13] 4. Stretcher and compressor setup for two-cycle signal pulses…”

Section: Generation Of Two-cycle Signal Pulses With Carrier-envelope mentioning

confidence: 99%

Few-cycle Optical Parametric Chirped Pulse Amplification

Käertner¹

2007

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden Over the last few years, ultrafast laser physics and frequency metrology has merged and provided us with unprecedented (sub-cycle) control over the electric field of few-cycle laser pulses emitted from modelocked lasers.These pulses and the corresponding technology are the prerequisite for high energy phase controlled few-cycle laser pulses, needed for reliable extreme ultraviolet (EUV) and soft x-ray production via high harmonic generation. It has been shown over the last few years that this technology leads to the generation of attosecond pulses and therefore opens up a new frontier in time and frequency measurements.The DURIP funding provided by AFOSR enabled us to buy the key components for the construction of phase controlled high energy optical parametric chirped pulse amplifiers that directly generate two-cycle optical pulses, i.e. l4fs at a center wavelength of 2Itm and later also of 5fs at 800nm at lkHz repetition rate without using external pulse compression. The major challenge is the construction of a high beam quality pump source and the dispersion compensation of the ultra wideband spectrum after amplification. We want to use this source for soft x-ray production via high harmonic harmonic generation (HHG) and later attosecond pulse generation. Furthermore, this system enables us to explore in the future few and single-cycle laser pulse generation over the wavelength range covering 700nm -2.6gtm. Unlike Ti:sapphire amplifiers, parametric amplification is not limited to a fixed wavelength range. Therefore, this system will enable us to explore few-cycle pulse generation from the visible to the far infrared enabling many experiments to come over the next years. In particular, this system once finalized over the next half year will be used in the DARPA funded project "Hyperspectral Radiography Sources using Cavity-Enhancement Techniques". One immediate experiment we want to explore is to study HHG as a function of the drive laser wavelength. It is expected that the cutoff wavelength of high harmonics scales as the square of the wavelength, because the wiggler energy of the freed electron scales with the wavelength at fixed intensity. This scaling, if successful, could allow the generation of keV radiation using high-order harmonic generation. Of course, many other yet unconsidered effects might change this simple scaling, such as higher absorption or larger phase mismatch at these higher frequencies scaling with the driver pulse wavelength. In the following, we describe in detail what has been accomplished over the last 1.5 years supported by the DURIP funding and the future...

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Section: Generation Of Two-cycle Signal Pulses With Carrier-envelope mentioning

confidence: 99%

Few-cycle Optical Parametric Chirped Pulse Amplification

Käertner¹

2007

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“…The most promising technique for mid-IR OFC generation is based on synchronously pumped optical parametric oscillators (OPOs) [1][2][3], in particular to those operated at degeneracy [1,2]. In another approach, the need for self-referenced operation in the mid-IR is circumvented by transferring a visible or near-IR OFC to the mid-IR by optical difference frequency mixing [4,5].…”

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Frequency-comb-referenced molecular spectroscopy in the mid-infrared region

2011

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A simple method for absolute-frequency measurements of molecular transitions in the mid-IR region is reported. The method is based on a cw singly resonant optical parametric oscillator (SRO), which is tunable from 3.2 to 3:45 μm. The mid-IR frequency of the SRO is referenced to an optical frequency comb through its pump and signal beams. Sub-Doppler spectroscopy and absolute-frequency measurement of the Pð7Þ transition of the ν 3 band of CH 4 are demonstrated.

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“…For achieving an optical clock and stabilized femtosecond laser frequency comb, we use an optical reference in the form of a methane stabilized HeNe laser similar to the laser described in [8] to stabilize the repetition rate [10]. Because of the octave spanning spectrum generated directly from the laser we are able to directly employ the f-2f self-referencing technique [1] The Ti:sapphire laser has a 1GHz repetition rate, and uses a 2.12 mm long Ti:sapphire crystal which has an absorption coefficient of 2.25 cm -1 , Fig.1.…”

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confidence: 99%

“…To By sending a fraction of the Ti:sapphire output through a 20 mm long periodically poled Lithium-Niobate crystal with a 21 µm poling period intrapulse Difference Frequency Generation (DFG) provides an offset free MID-IR frequency comb at 3.39 um for locking to the reference laser. To achieve good conversion efficiency, the beam is first reflected off of 5 DCM mirrors to ensure good temporal overlap of the spectral components which contribute most to the DFG 4 process, 810nm and 1064nm, which differs from earlier work by Foreman [10] due to the more symmetric output spectrum from the current laser. Because there is no offset frequency in the comb generated in the DFG process, stabilization of the DFG comb corresponds to direct stabilization of the frequency spacing between modes in the Ti:sapphire output spectrum, i.e.…”

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confidence: 99%