1. Main Spectral Parameters

• Spectral range: 7 octaves — from 340 nm (ultraviolet) to 40,000 nm (40 µm, terahertz range).
• Spectrum continuity: no spectral gaps across the entire range.
• Carrier‑envelope phase (CEP) stability:
• root‑mean‑square (RMS) deviation of fluctuations — less than 300 mrad;
• phase stability maintained across the full spectrum (from UV to THz).
• Brightness: 2–5 orders of magnitude higher than synchrotron sources in the IR range.
• Spectral power density:
• in the UV range (340–450 nm): comparable to pump power in the mid‑IR;
• at 3200 nm: peak intensity up to 2,5 MW;
• in the THz range (up to 40,000 nm): intensity of 1,8 MW, 15 dB/nm below the pump level.
• Coherence: high spatial and temporal coherence across the entire spectrum.

2. Pulse Parameters

• Pulse duration: sub‑cycle, less than 3 optical cycles.
• Central wavelength: 3200 nm (3,2 µm).
• Repetition rate: 160 kHz.
• Average power: 2,8 W.
• Pulse energy: 31 nJ.
• Peak power:
• in the UV range: up to 2,5 MW (at 35 bar pressure);
• in the THz range: 1,8 MW (at 20 bar pressure).
• Intensity: up to TW/cm2 in both UV and THz ranges.
• Pulse shape: controllable, with tunability via gas pressure adjustment in the fibre.

3. System Components and Their Parameters

3.1. Seed Source

• Type: fibre optical parametric chirped‑pulse amplifier (OPCPA) in the mid‑IR range.
• Pump wavelength: 3,2 µm.
• Operation mode: pulsed, with passive CEP stabilisation.
• Output radiation parameters:
• pulse duration: 94 fs;
• repetition rate: 160 kHz;
• average power: 2,8 W.

3.2. Microstructured Fibre (ARR‑PCF)

• Fibre type: anti‑resonant reflection photonic‑crystal fibre (Anti‑Resonant Reflection Photonic‑Crystal Fibre, ARR‑PCF).
• Length: 20 cm.
• Core diameter: 92 µm.
• Coupling efficiency: 93%.
• Construction: the fibre is placed inside a gas cell with CaF2​ windows (3 mm thick).
• Internal medium: argon (Ar) at adjustable pressure.
• Functions:
• soliton self‑compression of the pulse;
• dispersive wave (DW) generation;
• spectral broadening via nonlinear effects (self‑phase modulation, etc.).

3.3. Nonlinear Crystal

• Composition: BaGa2​GeSe6​ (BGGSe).
• Thickness: 2,6 mm.
• Process: intra‑pulse difference frequency generation (IP‑DFG).
• IP‑DFG efficiency: up to 2% under optimal conditions.
• Advantages:
• high nonlinear susceptibility;
• broad transparency in the mid‑IR and THz ranges;
• compatibility with high peak power.

3.4. CEP Stabilisation System

• Method: active feedback loop for carrier‑envelope phase control.
• Monitoring: electro‑optical sampling (EOS) for direct measurement of the electric field waveform.
• Stabilisation accuracy: fluctuations less than 300 mrad.
• Components:
• CEP detectors;
• control elements (piezo actuators, acousto‑optic modulators).

4. Operating Conditions and Settings

• Gas pressure in the fibre (argon): adjustable, in the range 20–35 bar:
• 25 bar — optimal dispersive wave generation and spectral broadening in the near‑IR;
• 35 bar — enhancement of the UV component (down to 340 nm), peak power of 2,5 MW in UV;
• 20 bar — spectral extension into the THz range (up to 40,000 nm), peak power of 1,8 MW.
• Energy conversion efficiency:
• into dispersive wave (at 35 bar): 0,2%, corresponding to an average power of 5 mW (31 nJ) in DW;
• overall supercontinuum generation efficiency: high due to cascaded nonlinear processes.
• Temperature regime: stable operation at room temperature, without active cooling.

5. Key Performance Metrics

• Dynamic range for spectroscopy: high, due to brightness and coherence.
• Compactness: table‑top source, requiring no large infrastructures (e.g., synchrotrons).
• Versatility: tunable spectral power distribution via gas pressure control.
• Synchronisation: low jitter between different spectral components, critical for time‑resolved measurements.
• Reliability: stable operation over long sessions (hours of continuous generation).

6. Practical Capabilities of the System

• Attosecond physics: generation of attosecond pulses from CEP‑stable mid‑IR radiation.
• Broadband spectroscopy: simultaneous analysis of molecular vibrations (IR) and electronic transitions (UV‑visible).
• Coherent control: manipulation of molecular and quantum system dynamics using synthesised pulses.
• Metrology: optical frequency combs with extended range for precision frequency measurements.
• Biophotonics and medicine: multimodal imaging (combination of UV fluorescence and IR spectroscopy).
• Materials research: study of topological materials, superconductivity, and phase transitions under strong fields.

Summary: the system represents the first compact source of CEP‑stable radiation with a 7‑octave spectral coverage, combining fibre optics, supercontinuum generation, and parametric amplification. Its key advantages are high brightness, stability, and the ability to tune the spectrum for specific applications.