scholarly journals Mid-infrared optical frequency comb in the 2.7–4.0 μm range via difference frequency generation from a compact laser system

2020 ◽  
Vol 8 ◽  
Author(s):  
Lian Zhou ◽  
Yang Liu ◽  
Gehui Xie ◽  
Chenglin Gu ◽  
Zejiang Deng ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Near Infrared ◽  
Quantum Noise ◽  
Frequency Comb ◽  
Laser System ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Average Output ◽  
Mid Infrared ◽  
Frequency Generation

Abstract We report on the generation of a mid-infrared (mid-IR) frequency comb with a maximum average output power of 250 mW and tunability in the 2.7–4.0 μm region. The approach is based on a single-stage difference frequency generation (DFG) starting from a compact Yb-doped fiber laser system. The repetition rate of the near-infrared (NIR) comb is locked at 75 MHz. The phase noise of the repetition rate in the offset-free mid-IR comb system is measured and analyzed. Except for the intrinsic of NIR comb, environmental noise at low frequency and quantum noise at high frequency from the amplifier chain and nonlinear spectral broadening are the main noise sources of broadening the linewidth of comb teeth, which limits the precision of mid-IR dual-comb spectroscopy.

scholarly journals Widely-tunable mid-infrared frequency comb source based on difference frequency generation

2012 ◽  
Vol 37 (12) ◽  
pp. 2232 ◽  
Author(s):  
Axel Ruehl ◽  
Alessio Gambetta ◽  
Ingmar Hartl ◽  
Martin E. Fermann ◽  
Kjeld S. E. Eikema ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Mid Infrared ◽  
Frequency Generation

scholarly journals Intensity noise optimization of a mid-infrared frequency comb difference-frequency generation source

2020 ◽  
Vol 45 (7) ◽  
pp. 1914
Author(s):  
Vinicius Silva de Oliveira ◽  
Axel Ruehl ◽  
Piotr Masłowski ◽  
Ingmar Hartl
Keyword(s):  
Frequency Comb ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Intensity Noise ◽  
Mid Infrared ◽  
Noise Optimization ◽  
Frequency Generation

scholarly journals Mid-infrared frequency comb with 67 W average power based on difference frequency generation

2020 ◽  
Vol 45 (5) ◽  
pp. 1248 ◽  
Author(s):  
Anthony Catanese ◽  
Jay Rutledge ◽  
Myles C. Silfies ◽  
Xinlong Li ◽  
Henry Timmers ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Average Power ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Mid Infrared ◽  
Frequency Generation

scholarly journals Highly efficient difference-frequency generation for mid-infrared pulses by passively synchronous seeding

2021 ◽  
Vol 9 ◽  
Author(s):  
Kun Huang ◽  
Yinqi Wang ◽  
Jianan Fang ◽  
Huaixi Chen ◽  
Minghang Xu ◽  
...  
Keyword(s):  
Laser System ◽  
Average Power ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Infrared Source ◽  
Mid Infrared ◽  
Long Term Stability ◽  
Polarization Maintaining Fiber ◽  
Laboratory Operation ◽  
Frequency Generation

Abstract We have proposed and experimentally demonstrated a novel scheme for efficient mid-infrared difference-frequency generation based on passively synchronized fiber lasers. The adoption of coincident seeding pulses in the nonlinear conversion process could substantially lower the pumping threshold for mid-infrared parametric emission. Consequently, a picosecond mid-infrared source at 3.1 μm was prepared with watt-level average power, and a maximum power conversion efficiency of 77% was realized from pump to down-converted light. Additionally, the long-term stability of generated power was manifested with a relative fluctuation as low as 0.17% over one hour. Thanks to the all-optical passive synchronization and all-polarization-maintaining fiber architecture, the implemented laser system was also featured with simplicity, compactness and robustness, which would favor subsequent applications beyond laboratory operation.

scholarly journals Spectroscopic Imaging with an Ultra-Broadband (1–4 THz) Compact Terahertz Difference-Frequency Generation Source

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 336
Author(s):  
Atsushi Nakanishi ◽  
Shohei Hayashi ◽  
Hiroshi Satozono ◽  
Kazuue Fujita
Keyword(s):  
Imaging Technique ◽  
Spectroscopic Imaging ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Quality Monitoring ◽  
Terahertz Emission ◽  
Mid Infrared ◽  
Quantum Cascade ◽  
Frequency Generation ◽  
Multi Mode

We demonstrate spectroscopic imaging using a compact ultra-broadband terahertz semiconductor source with a high-power, mid-infrared quantum cascade laser. The electrically pumped monolithic source is based on intra-cavity difference-frequency generation and can be designed to achieve an ultra-broadband multi-mode terahertz emission spectrum extending from 1–4 THz without any external optical setup. Spectroscopic imaging was performed with three frequency bands, 2.0 THz, 2.5 THz and 3.0 THz, and as a result, this imaging technique clearly identified three different tablet components (polyethylene, D-histidine and DL-histidine). This method may be highly suitable for quality monitoring of pharmaceutical materials.

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