Monocrystalline silicon ultra-stable cavity (square cavity）
The monocrystalline silicon superstable cavity (square cavity) is a core optical device for the frontier high-precision optical and quantum fields. It is made from high-purity monocrystalline silicon as the base material and is precisely processed. It has excellent performance in terms of dimensional accuracy, surface shape quality, and structural stability, and can perfectly meet the demanding application requirements in fields such as superstable lasers, quantum technology, and gravitational wave detection. It provides high-reliability optical core support for cutting-edge scientific research and engineering applications.
Core application areas
It is widely used in cutting-edge research and technology application scenarios such as ultra-stable lasers, time-frequency transfer, quantum computing, quantum communication, quantum precision measurement, neutral atoms, cold atoms, Rydberg atom research, gravitational wave detection, etc.
Key technical parameters
Indicators | Specific parameters |
External dimensions range | 10×10×10-200×200×200 |
Through-hole diameter and precision | Aperture φ4-φ12; Position 0.05; Perpendicularity to the reference plane ≤2 ' |
Parallelism and perpendicularity of the working surface | ≤(3 "-2 ') |
Work area plane shape | Better than λ/8 @632.8nm |
Defects and surface roughness in the work area | Defects 40-20; Surface roughness 0.5nm |
Fabrication materials | Monocrystalline silicon |
High-quality monocrystalline silicon substrate:
Unleashing ultra-low noise core performance Crafted from high-purity monocrystalline silicon with a uniform crystal structure, our Monocrystalline Silicon Ultra-stable Square Cavity leverages silicon’s superior properties at cryogenic temperatures—ultra-low thermal expansion, high thermal conductivity and stable mechanical structure—for industry-leading performance. The monocrystalline silicon cavity body is precision-machined to eliminate grain boundaries and internal defects, minimizing thermomechanical noise and mechanical dissipation. The cavity mirrors feature crystalline semiconductor coatings (e.g., The (Al₀.₉₂Ga₀.₀₈As/GaAs) coatings, which have mechanical loss ten times smaller than traditional amorphous dielectric coatings, significantly reduce coating thermal noise. These crystalline coatings offer high reflectivity (>99.97%) and excellent stability at cryogenic temperatures (down to 3K), ensuring reliable resonance performance for long-term experiments.
Precision square structure design:
Balancing stability and integration. Our Monocrystalline Silicon Ultra-stable Square Cavity features a precision-engineered square design with a compact footprint (standard 25mm-50mm side length, 50mm-100mm length), making it ideal for integration into closed-cycle cryostats and space-constrained high-precision systems. The square structure provides enhanced structural rigidity compared to circular designs, minimizing deformation under mounting stress and vibration. An integrated vacuum port enables evacuation to levels better than 10⁻⁶Pa, eliminating air-induced refractive index fluctuations and thermal convection noise. The cavity incorporates a thermal management system that takes advantage of silicon's high thermal conductivity to maintain a uniform temperature. with a zero-expansion temperature point tunable between 2°C-40°C to minimize cavity length drift. Separate supporting structures for cryocooler and sample chamber ensure vibration control on the 1×10⁻⁷g level at one second.
Core performance advantages:
Adapted for cutting-edge precision scenarios
Ultraopto's Monocrystalline Silicon Ultra-stable Square Cavity features outstanding frequency stability, with an Allan variance as low as 1×10⁻¹⁶ at one-second integration, marking a tenfold improvement in short-term instability compared to previous sub-10K systems. The cavity demonstrates high finesse (up to 250,000) due to ultra-high mirror reflectivity. enabling sharp resonance peaks for precise laser locking via Pound-Drever-Hall (PDH) technology. Its cryogenic compatibility (operable at liquid helium temperatures down to 3K) reduces the thermal noise floor, bringing 10⁻¹⁸ instability within reach—a long-sought goal of the optical clock community. The cavity supports fundamental mode (TEM₀₀) operation, suppressing higher-order transverse modes and ensuring pure frequency reference signals, with long-term drift controlled below 1Hz/day.
Full-scenario application coverage:
Empowering high-end scientific research and aerospace industries Our Monocrystalline Silicon Ultra-stable Square Cavity is widely applied in cutting-edge scientific, aerospace and industrial fields. In atomic clocks, it provides the ultra-stable frequency reference required for record-breaking timekeeping accuracy and dark matter detection. For quantum computing, it enables stable operation of quantum bits (qubits) by providing a low-noise optical reference. In cryogenic laser systems, it serves as a frequency reference to lock narrow-linewidth lasers for gravitational wave detection and optical communication. The cavity also finds use in precision spectroscopy, very-long-baseline interferometers and space-based missions, delivering reliable ultra-stable performance in the most demanding environments.
Customized services:
Meeting personalized needs As a leading manufacturer of ultra-stable optical cavities, Ultraopto offers fully customized Monocrystalline Silicon Ultra-stable Square Cavity solutions to meet your unique application requirements. Our professional R&D team can tailor key parameters including cavity dimensions (side length 25mm-100mm, length 50mm-200mm), mirror coating type (AlGaAs/GaAs, custom crystalline coatings), Operating wavelength (500-1600nm), finesse (5,000-250,000), and compatibility with cryogenic temperature ranges. We support custom vacuum flange designs, fiber coupling options, and integrated thermal control systems for extreme environments. All custom cavities undergo multi-stage strict quality inspection, including cavity length measurement, frequency stability testing, coating noise characterization and cryogenic performance verification, with a detailed quality report provided to ensure compliance with your design specifications.
Quality Assurance and Technical Support:
Your Trusted Choice Backed by advanced monocrystalline silicon processing technology and a complete quality control system, Ultraopto ensures stable batch supply and consistent product quality. Our production processes adhere to international precision optical standards, with each cavity subjected to rigorous testing using laser interferometers, frequency stability analyzers and cryogenic environmental chambers. We provide professional technical consultation on cavity selection, cryogenic integration, laser locking implementation and vibration isolation, helping you achieve optimal system performance. Whether you need standard cavities for laboratory research or custom solutions for aerospace applications, Ultraopto’s Monocrystalline Silicon Ultra-stable Square Cavity delivers exceptional value and reliability.
For more detailed technical parameters, product quotation information or custom design solutions for our Ultraopto Monocrystalline Silicon Ultra-stable Square Cavity, please contact our professional sales and technical team through the official website, and we will provide you with efficient, personalized and professional optical solutions.
