ULE Ultra-stable cavity (round cavity)
ULE ultra-stable cavity (circular cavity) is a core optical device developed for ultra-stable laser, quantum technology and other cutting-edge high-precision fields. It is made of high-quality ULE material through ultra-precision processing and performs exceptionally well in dimensional accuracy, surface shape quality and structural stability, fully meeting the strict requirements of high-end scientific research and engineering applications. It provides highly reliable optical core support for research in various frontier optical and quantum fields.
Core application areas
It is widely applicable to 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 | Diameter 10-100mm, length L=5-200 |
Long through hole diameter | From 4 to 12 |
Parallelism of the working surface | 10 or less" |
Work area plane shape | Better than λ/[email protected] |
Work area defects | Better than 40-20 |
Making materials | ULE |
Premium material combination:
Achieving ultra-low thermal expansion performance
Crafted from high-quality ULE glass (ultra-low expansion glass) for the cavity body and fused silica for the cavity mirrors, our ULE Ultra-stable Circular Cavity achieves an ultra-low thermal expansion coefficient of 10⁻⁸/K. significantly reducing cavity length drift under temperature fluctuations. The ULE glass cavity body features a circular cylindrical design with precise internal dimensions, while the fused silica mirrors (one plano, One concave mirror with a 500mm radius of curvature is bonded to the cavity ends via optical contact. The mirror substrates undergo super-precision polishing to achieve a surface roughness of less than 0.1nm, with high-reflection (HR) coatings optimized for key wavelengths (670nm, 701nm, 1064nm) delivering reflectivity of over 99.97%. This material combination overcomes thermal expansion mismatches between the cavity and the mirrors. suppressing mirror deformation and ensuring long-term stability.
Precision Structural Design:
Enhancing Stability and Performance
Our ULE Ultra-stable Circular Cavity features a precisely engineered circular structure with an axial through-slot design to improve thermal uniformity and facilitate vacuum integration. The cavity length is strictly controlled within ±0.001mm, with the internal diameter tolerance optimized for mode matching (standard 50mm-70mm diameter, 100mm length). A top-mounted evacuation port enables evacuation to vacuum levels better than 10⁻⁶Pa, eliminating refractive index fluctuations caused by air pressure changes and thermal convection. The cavity is equipped with ULE rings concentrically bonded to the mirror backsides, creating a composite structure that further tunes the effective thermal expansion coefficient and enables zero-expansion operation near room temperature (2°C-40°C).
Core performance advantages:
Adapted for ultra-low noise scenarios
Ultraopto's ULE Ultra-stable Circular Cavity features outstanding frequency stability with an Allan variance of approximately 1×10⁻¹⁵, making it perfect for ultra-narrow linewidth laser stabilization. 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 low acceleration sensitivity (<5×10⁻¹¹/g) minimizes vibration-induced noise, while multi-layer thermal shielding design attenuates environmental temperature fluctuations. 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 precision spectroscopy.
Full-scenario application coverage:
Empowering high-end precision optics Our ULE Ultra-stable Circular Cavity is widely applied in cutting-edge scientific and industrial fields. In laser stabilization systems, it serves as a frequency reference to lock narrow-linewidth lasers for gravitational wave detection and optical communication. For atomic clocks (Yb, Sr, Ca-based), it provides the stable frequency reference required for ultra-precise timekeeping. In precision spectroscopy and optical frequency metrology, it enables high-resolution spectral analysis and optical frequency comb locking. The cavity also finds use in quantum computing, laser radar (LIDAR) with long coherence time, and fiber sensing systems, delivering reliable ultra-stable performance for the most demanding applications.
Customized services:
Meeting personalized needs As a leading manufacturer of ultra-stable optical cavities, Ultraopto offers fully customized ULE Ultra-stable Circular Cavity solutions to meet your unique application requirements. Our professional R&D team can tailor key parameters including cavity dimensions (length 50mm-300mm, diameter 30mm-100mm), mirror curvature radius, operating wavelength (UV to NIR), Finesse (600 - 15,000) and zero-expansion temperature point (2°C - 40°C). We support custom vacuum flange designs, multi-wavelength mirror coatings and integrated thermal control systems. All custom cavities undergo multi-stage strict quality inspection, including cavity length measurement, frequency stability testing, reflectivity verification and thermal expansion coefficient 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 ULE 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 vacuum performance equipment. We provide professional technical consultation on cavity selection, vacuum integration, thermal management 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 ULE Ultra-stable Circular Cavity delivers exceptional value and reliability.
For more detailed technical parameters, product quotation information or custom design solutions for our Ultraopto ULE Ultra-stable Circular 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.
