Sapphire ultra-stable cavity (square cavity)
Our sapphire ultra-stable cavity (square cavity) is a high-end core component specifically designed for the cutting-edge precision optics field. Made entirely of sapphire material, it combines ultra-high structural stability with excellent optical performance, with a wide range of size specifications, strict shape and position accuracy and optical indicators, perfectly matching the extreme application requirements of high-end scenarios such as ultra-stable lasers, quantum computing, gravitational wave detection, etc. It provides the core support of high stability and high precision for cutting-edge optical systems.
Core Product Parameters
Product Core advantages
Screening metrics | Specific parameters |
External dimensions | 10×10×10 - 200×200×200mm |
Through-hole diameter and precision | Through hole diameter D=φ4-φ12; The perpendicularity of the hole to the reference plane ≤2 '; The positional degree of the hole is 0.05 |
Parallelism and perpendicularity of the working surface | Relative plane parallelism: 3 "-2 '; Perpendicularity of adjacent planes: 3 "-2 ' |
Work area plane shape | Better than λ/[email protected] |
Work area defects and surface roughness | Work area defects: 40-20; Surface roughness: 0.5nm |
Base material | Sapphire |
High-end single crystal material:
Made entirely of sapphire, it has anextremely low coefficient of thermal expansion, excellent heat resistance and laser damage resistance, super-stable structure and optical performance, suitable for complex and demanding working conditions.
Ultimate form and position accuracy:
through-hole perpendicularity ≤2 ', position accuracy 0.05, working surface parallelism and perpendicularity 3 "-2 ', strict form and position tolerance control ensures precise assembly and operation of the optical system.
Superior optical performance:
Working area surface shape is better than λ/[email protected], surface roughness is as low as 0.5nm, defect grade is 40-20, optical surface quality is excellent, significantly reduces light transmission loss and improves system accuracy.
Wide specification coverage:
Form dimensions range from 10×10×10 to 200×200×200mm, suitable for assembly requirements of different leading-edge optical systems, with strong application flexibility and support for customized adaptation.
Multi-scenario adaptation:
Customized for application requirements in cutting-edge fields such as ultra-stable lasers, quantum technology, and gravitational wave detection, performance indicators meet industry high-end standards and can be quickly integrated without secondary debugging.
Core application areas
The core is applied in cutting-edge precision optics and quantum technology fields such as ultra-stable lasers, time-frequency transfer, quantum computing, quantum communication, quantum precision measurement, neutral/cold/Rydberg atom research, gravitational wave detection, etc. It is a core key component of all kinds of high-end optical systems.
High-quality sapphire substrate:
Unleashing ultra-stable core performance Crafted from high-purity single-crystal sapphire with exceptional optical homogeneity and mechanical stability, our Sapphire Ultra-stable Square Cavity achieves industry-leading frequency stability down to 2×10⁻¹⁶ at one second integration. Sapphire’s unique properties at cryogenic temperatures—low thermal noise, high thermal conductivity and stable mechanical structure—make it an ideal material for ultra-stable cavity applications, outperforming traditional glass substrates in extreme environments. The square cavity body is precision-machined from a single sapphire crystal to eliminate internal defects and stress, Precision square structure design: balancing stability and compactness.
Our Sapphire 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 space-constrained systems such as cryogenic chambers and portable high-precision instruments. 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 internal thermal channels to ensure uniform temperature distribution, while the rigid square frame supports two-stage vibration isolation. suppressing vibration noise by two orders of magnitude in all directions at frequencies above tens of hertz.
Core performance advantages:
Suitable for extremely precise scenarios
Ultraopto’s Sapphire Ultra-stable Square Cavity features outstanding frequency stability with an Allan variance as low as 1×10⁻¹⁵, guaranteeing reliable performance for long-term experiments. The cavity demonstrates high finesse (up to 15,000) thanks 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) makes it suitable for low-temperature physics research, while low acceleration sensitivity (~2×10⁻¹⁰/g) minimizes vibration-induced noise. The cavity supports fundamental mode (TEM₀₀) operation, suppressing higher-order transverse modes and ensuring pure frequency reference signals. Long-term drift is controlled below 1Hz/day, meeting the stringent requirements of atomic clocks and fundamental physics tests.
Full-scenario application coverage:
Empowering high-end precision optics Our Sapphire Ultra-stable Square Cavity is widely applied in cutting-edge scientific and industrial fields. In atomic clocks (Yb, Sr, Ca-based), it provides the ultra-stable frequency reference required for ultra-precise timekeeping. For fundamental physics research, it enables tests of the isotropy of light propagation at the 10⁻²⁰ level. 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, quantum computing and aerospace optical sensors, 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 Sapphire 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 curvature radius, operating wavelength (UV to NIR), Finesse (600 - 15,000) and compatibility with cryogenic temperature ranges. We support custom vacuum flange designs, multi-wavelength mirror coatings, and integrated thermal control systems for extreme environments. All custom cavities undergo multi-stage strict quality inspection, including cavity length measurement and frequency stability testing. reflectivity verification and cryogenic performance characterization, with a detailed quality report provided to ensure compliance with your design specifications.
Quality Assurance and Technical Support:
Your Trusted Choice Backed by advanced sapphire 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, vibration isolation and laser locking implementation, helping you achieve optimal system performance. Whether you need standard cavities for laboratory research or custom solutions for atomic clock manufacturing, Ultraopto’s Sapphire Ultra-stable Square Cavity delivers exceptional value and reliability.
For more detailed technical parameters, product quotation information or custom design solutions for our Ultraopto Sapphire 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.
