Fully stabilized mid-infrared frequency comb for high-precision molecular spectroscopy

Vainio, Markku; Karhu, Juho

doi:10.1364/oe.25.004190

Cited by 31 publications

(19 citation statements)

References 33 publications

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“…Spectral variation as a function of cavity detuning is also observed with singly-resonant SP-OPOs [12]. Note that in the case of a degenerate doubly-resonant SP-OPO only the envelope spectrum of the MIR comb changes, not the comb line positions, which are tightly locked to the pump comb [10,13]. Passive thermal locking can often maintain SP-OPO oscillation for several minutes or more [7,14], albeit with poor stability of the output power and spectrum, unless a crystal of large thermal effect, such as GaAs, is used [15].…”

Section: Synchronously Pumped Optical Parametric Oscillator (Sp-opo) mentioning

confidence: 76%

“…This setup, which is a typical example of an Er-laser-pumped femtosecond MIR comb generator, is described in detail in Ref. [10]. Oscillation of SP-OPO is possible only when the round-trip time of the OPO resonator is synchronized to the pump repetition rate fr.…”

mentioning

confidence: 99%

“…Schematic of the degenerate SP-OPO[10]. About 35% of the resonating signal/idler power is coupled out with a pellicle beam splitter (BS).…”

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confidence: 99%

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Stabilization of femtosecond optical parametric oscillators for infrared frequency comb generation

Vainio

Halonen

2017

Opt. Lett.

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A synchronously pumped optical parametric oscillator (SP-OPO) is one of the most common techniques to generate femtosecond frequency combs in the mid-infrared region. Stable long-term operation of an SP-OPO requires active locking of the OPO resonator round-trip time to the pump pulse interval. A simple modulation-free locking method based on stabilization of narrow-band frequency-doubled power of the SP-OPO output comb is demonstrated in this Letter. The method relies on the strong dependency of frequency-doubled power on spectral shape of the comb, leading to better stability of the comb envelope spectrum than the commonly used dither-and-lock method.

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Section: Synchronously Pumped Optical Parametric Oscillator (Sp-opo) mentioning

confidence: 76%

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confidence: 99%

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Stabilization of femtosecond optical parametric oscillators for infrared frequency comb generation

Vainio

Halonen

2017

Opt. Lett.

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“…This corresponds to ~75 % pump depletion and was measured with the maximum pump power of 1.2 W that was available at the crystal input. The linewidth of the mid-infrared idler beam is ~ 10 MHz, which was measured by direct beat-frequency comparison against a fully stabilized mid-infrared frequency comb [15]. Long-term stability of the idler frequency is exemplified in Fig.…”

Section: (A)mentioning

confidence: 99%

Diode-laser-pumped continuous-wave optical parametric oscillator with a large mid-infrared tuning range

Ulvila

Vainio

2019

Optics Communications

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We report a singly resonant continuous-wave optical parametric oscillator (SRO), which is pumped by a semiconductor laser system and operates in the midinfrared region (2.9 to 3.6 µm). Fast tuning of the midi n f r a r e d o u t p u t w a v e l e n g t h b y m o r e t h an 2 0 0 n m i s demonstrated by scanning the pump laser wavelength through only 1.25 nm, without any need to adjust the SRO settings. The exceptionally large tuning range is obtained by choosing a pump wavelength (780 nm) that corresponds to a turning point of the group velocity mismatch between the phase-matched signal and idler waves of the SRO.

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“…The output power from the fs-OPO is about 20 mW after filtering out the residual pump beam. Details of the fs-OPO comb can be found in [34].…”

Section: Cw-opo Lockingmentioning

confidence: 99%

Frequency comb assisted two-photon vibrational spectroscopy

et al. 2017

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We report a setup for high-resolution two-photon spectroscopy using a mid-infrared continuous wave optical parametric oscillator (CW-OPO) and a near-infrared diode laser as the excitation sources, both of which are locked to fully stabilized optical frequency combs. The diode laser is directly locked to a commercial near-infrared optical frequency comb using an optical phaselocked loop. The near-infrared frequency comb is also used to synchronously pump a degenerate femtosecond optical parametric oscillator to produce a fully stabilized mid-infrared frequency comb. The beat frequency between the mid-infrared comb and the CW-OPO is then stabilized through frequency locking. We used the setup to measure a double resonant twophoton transition to a symmetric vibrational state of acetylene with a sub-Doppler resolution and high signal-to-noise ratio.© 2017 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. Bartalini, and P. De Natale, "Subkilohertz linewidth room-temperature mid-infrared quantum cascade laser using a molecular sub-Doppler reference," Opt. Lett. 37(23), 4811-4813 (2012). 9.

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Fully stabilized mid-infrared frequency comb for high-precision molecular spectroscopy

Cited by 31 publications

References 33 publications

Stabilization of femtosecond optical parametric oscillators for infrared frequency comb generation

Stabilization of femtosecond optical parametric oscillators for infrared frequency comb generation

Diode-laser-pumped continuous-wave optical parametric oscillator with a large mid-infrared tuning range

Frequency comb assisted two-photon vibrational spectroscopy

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