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Description

852 nm Single Frequency Fiber Laser – Ultra-Stable Source for Cesium and Quantum Experiments

The 852 nm Single Frequency Fiber Laser (model CoSF-FC-852) is an ultra‑stable, narrow‑linewidth laser source specifically engineered for demanding atomic and quantum optics applications. Operating in continuous-wave (CW) single frequency and single longitudinal mode, this laser provides up to 200 mW of linearly polarized output at 852 nm with excellent beam quality (M² ≤ 1.1). Its design is based on mature distributed feedback Bragg grating (DFB) fiber laser technology originally developed at 1.5 µm and 1.9 µm, combined with nonlinear frequency conversion to achieve a stable 852 nm output. This approach allows the system to surpass the noise performance and spectral purity of typical tapered amplifier (TA) and diode-based solutions widely used in cesium experiments.

With a linewidth of less than 20 kHz and high side-mode suppression ratio (SMSR ≥ 30–40 dB), the laser provides a spectrally clean source suitable for high‑resolution spectroscopy and long‑term frequency‑sensitive measurements. The output is linearly polarized with a polarization extinction ratio (PER) of typically 20 dB, ensuring reliable interaction with polarization‑selective optical setups such as polarization‑sensitive atomic transitions, interferometers, and advanced quantum measurement schemes. Power stability is typically within ±1% (peak‑to‑peak), delivering exceptional amplitude stability for experiments requiring long integration times or precise control of trapping and cooling intensities.

The 852 nm wavelength is a key resonance line for cesium atoms, making this laser particularly well suited for cesium atom cooling, magneto‑optical traps (MOTs), and optical pumping stages in cold atom experiments. In cesium atomic clocks, the combination of narrow linewidth, low phase noise, and stable output power supports both optical interrogation and laser‑cooled clock transitions, improving clock performance and reducing systematic shifts. Compared with standard external‑cavity diode lasers and TA‑amplified systems commonly used in these setups, this fiber‑based source offers improved coherence, reduced technical noise, and significantly better long‑term stability.

For Rydberg physics and Rydberg-inspired quantum technology, coherence and spectral purity are critical. The sub‑20 kHz linewidth and low frequency noise characteristics help maintain narrow excitation features and long coherence times, which are essential for Rydberg state manipulation, quantum nonlinear optics, and quantum information experiments. The laser’s clean spatial mode and high beam quality also enable efficient focusing into vapor cells, optical cavities, and cold atom ensembles, maximizing interaction strength and experimental signal‑to‑noise ratio.

In broader quantum measurement and cold atomic physics applications, the CoSF-FC-852 provides a versatile and robust platform. The wavelength can be thermally tuned over 0.3–0.4 nm with fine tuning resolution down to 0.1 pm, enabling precise alignment to specific cesium transitions and detunings required for cooling, trapping, or probing. Optional PZT-based fast wavelength modulation offers up to 10–15 GHz modulation range with linear modulation frequencies up to 20 kHz, making the laser suitable for techniques such as Pound–Drever–Hall (PDH) locking, frequency stabilization to high‑finesse cavities, and active locking to atomic references. These capabilities position the laser as a high‑performance alternative to conventional ECDL–TA systems that often require more complex alignment and maintenance.

The laser is delivered as a benchtop or module package with an AC 100–240 V power supply and RS‑232 communication interface for remote control and monitoring. Output is provided via PM780 polarization‑maintaining fiber, typically longer than 0.5 m, terminated with an FC/APC connector; free‑space collimated output is also available depending on configuration. Output power is tunable from about 30% up to 100% of the specified level, giving users fine control over optical power for sensitive experimental conditions. The system operates reliably between 0 and 40 °C, with storage specified from –20 to 60 °C, ensuring stable performance in standard laboratory environments. Overall, the 852 nm Single Frequency Fiber Laser offers a turnkey, low‑noise, narrow‑linewidth solution optimized for cesium‑based research, precision metrology, and advanced quantum technologies.

852nm Single Frequency Fiber Laser

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Specifications

Center Wavelength: 851 nm
Output Power: 0.2 W
Output Mode: Continuous Wave (CW), Single Frequency, Single Longitudinal Mode
Beam Quality (M^2): 1.05
Spectral Linewidth: 4.83E-8 nm
Output Power Stability: 0.9% ~ 1.0%
Output Fiber Type: PMF
Output Fiber Length: 0.5 m
Interface: RS-232
Cooling: Air Cooled
Electrical Requirements: 110V - 60Hz, 115V - 50Hz, 115V - 60Hz, 120V - 60Hz, 127V - 50Hz, 127V - 60Hz, 220V - 50Hz, 230V - 50Hz, 230V - 60Hz, 240V - 50Hz
Linewidth: <20 kHz
SMSR: 40 dB
Output Polarization: Linear
Polarization Extinction Ratio (PER): 20 dB
Output Power Tunable Range: 30~100 %
Wavelength Thermal Tuning Range: 0.4 nm
Wavelength Tunable Resolution: 0.1 pm
PZT Wavelength Modulation: Optional
PZT Modulation Frequency (Linear): 20 kHz
PZT Modulation Wavelength Range: 15 GHz
Operating Temperature: 0~40 ℃
Storage Temperature: -20~60 ℃
Output Fiber Connector: FC/APC
Dimension: 510x480x150 mm

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Features

  • 852 nm Single-Frequency Fiber Laser – Precision-designed CW laser source at 852 nm with single longitudinal mode operation, ideal for cesium-based and quantum optics experiments.
  • Ultra-Narrow Linewidth (< 20 kHz) – Extremely low spectral width for high coherence length, reduced phase noise, and improved frequency stability in metrology and interferometric setups.
  • High Spectral Purity (SMSR > 40 dB typical) – Excellent side-mode suppression ratio to minimize spurious modes, ensuring clean, well-defined emission for high-precision atomic and quantum measurements.
  • High Output Power up to 200 mW – Fiber-coupled output delivering up to 200 mW at 852 nm (typ. 100 mW, tunable from 30%–100%), providing ample power for cesium atom cooling, optical pumping, and trapping.
  • Single-Frequency, Low-Noise Operation – Proven DFB-based single-frequency architecture (inherited from mature 1.5 µm / 1.9 µm designs) combined with nonlinear conversion for low phase noise and frequency noise performance, superior to typical TA semiconductor lasers.
  • Linear Polarization with High PER – Linearly polarized output with polarization extinction ratio of > 20 dB (typ.), ensuring high polarization stability for precision spectroscopy, interferometry, and quantum state control.
  • Excellent Beam Quality (M² ≤ 1.1) – Near-diffraction-limited beam quality (M² typ. 1.05) for efficient fiber coupling, tight focusing, and uniform illumination in cold atom and quantum optics experiments.
  • Outstanding Power Stability – Output power stability better than ±1% typical (±2% max), enabling long-term, repeatable measurements in atomic clocks, frequency standards, and lab setups.
  • Fine Wavelength Tuning & Thermal Control – Integrated temperature control offers 0.3–0.4 nm thermal tuning range with up to 0.1 pm wavelength resolution, enabling precise alignment to specific cesium transitions and narrow spectral features.
  • Optional Fast PZT Wavelength Modulation – Built-in PZT option for high-speed wavelength modulation up to 20 kHz (linear) with 10–15 GHz tuning range, ideal for frequency locking, laser stabilization, and spectroscopy modulation schemes.
  • PM Fiber Output for Polarization Stability – Delivered through PM780 polarization-maintaining fiber (length > 0.5 m) with FC/APC connector, ensuring robust polarization alignment and minimal back-reflection in sensitive atomic and quantum setups.
  • Benchtop or Module Configurations – Flexible ordering options: benchtop (B) or module (M) packages with selectable output powers (e.g., 50 mW, 100 mW, 200 mW) and free-space (COL) or FC/APC fiber (FA) output.
  • Laboratory-Ready AC-Powered System – Operates from standard AC 100–240 V mains, with integrated control electronics and RS232 interface for straightforward bench integration.
  • RS232 Control & Easy System Integration – Remote control via RS232 communication interface allows integration into automated experimental platforms, enabling computer-controlled power, wavelength, and modulation settings.
  • Wide Operating Temperature Range – Reliable performance from 0 to 40 °C operating temperature and -20 to 60 °C storage temperature, supporting stable operation in typical lab and rack environments.
  • Compact, Rack-Compatible Footprint – Space-efficient design (approx. 510 × 480 × 150 mm for benchtop) suitable for optical tables, racks, and integrated experimental stations.
  • Optimized for Cesium & Quantum Experiments – Specifically tailored for cesium atom cooling, cesium atomic clocks, Rydberg excitation, quantum measurement, and cold atomic physics where narrow-linewidth, highly stable 852 nm light is essential.

Applications

  • Cesium atom cooling and trapping – 852 nm D2-line excitation for magneto‑optical traps (MOTs), optical molasses, and sub‑Doppler cooling of cesium atoms.
  • Cesium atomic clocks – optical pumping and state preparation for primary and secondary cesium frequency standards and compact atomic clock systems.
  • Rydberg atom excitation – narrow-linewidth source for multi‑photon excitation schemes to high‑n Rydberg states in cesium for quantum simulation and sensing.
  • Quantum measurement and metrology – precision spectroscopy, Ramsey interferometry, and frequency stabilization experiments requiring low phase and frequency noise.
  • Cold atom physics – laser cooling, trapping, and manipulation of ultracold cesium ensembles for studies of many‑body physics and quantum gases.
  • Optical lattice experiments – generation of optical lattices and tailored trapping potentials for cesium‑based quantum simulators and Hubbard‑model studies.
  • Quantum information processing with neutral atoms – high‑coherence control fields for qubit initialization, manipulation, and readout in cesium atom arrays and quantum registers.
  • Quantum sensing and inertial navigation – narrow‑linewidth local oscillator for atom interferometers used in gravimetry, gradiometry, and rotation sensing.
  • High‑resolution laser spectroscopy – Doppler‑free and saturated absorption spectroscopy on cesium D lines and nearby transitions requiring kHz‑class linewidth.
  • Frequency reference and laser stabilization – 852 nm reference for offset‑locking, phase‑locking, and frequency comb stabilization to cesium transitions.
  • Nonlinear and frequency conversion experiments – pump or seed source in nonlinear crystals or waveguides for sum‑frequency, difference‑frequency, or up‑conversion schemes near 852 nm.
  • Electromagnetically induced transparency (EIT) – probe or coupling field in EIT, slow‑light, and light‑storage experiments in cesium vapors or cold atoms.
  • Precision magnetometry – optical pumping and probing for atomic magnetometers based on cesium ground‑state coherences.
  • Optical coherent control and Ramsey spectroscopy – driving narrow transitions with long coherence times for precision phase and frequency control.
  • Optical frequency comb referencing around 852 nm – narrow‑line seed for comb tooth stabilization and transfer of cesium‑locked stability to other spectral regions.
  • Laser cooling development and teaching laboratories – robust, fiber‑coupled source for university‑level cold atom and quantum optics experiments.
  • Fiber‑based experimental setups – plug‑and‑play integration into polarization‑maintaining fiber networks for stable delivery to multiple optical tables or modules.
  • High‑coherence optical probing of nanophotonic and cavity systems – excitation of microcavities, photonic crystal cavities, and resonators designed around cesium transitions.
  • Atomic vapor cell devices – interrogation of miniaturized cesium vapor cells for chip‑scale atomic clocks and quantum sensors.
  • Fundamental tests of physics – long‑term stable, narrow‑line laser for precision tests involving cesium, such as measurements of fundamental constants or symmetry tests.

Frequently Asked Questions

What is the CoSF-FC-852 852 nm single frequency fiber laser and what makes it different from TA or ECDL semiconductor lasers?
The CoSF-FC-852 is a narrow-linewidth, single-frequency fiber laser that outputs around 852 nm with single longitudinal mode operation and linear polarization. It is based on a 1.5/1.9 µm DFB fiber laser and nonlinear frequency conversion, similar in concept to other high‑end single-frequency fiber lasers used in atomic physics. Compared with traditional tapered amplifier (TA) systems or external cavity diode lasers (ECDLs) at 852 nm, it offers a much narrower linewidth (
What are the key specifications of the 852 nm single frequency fiber laser (linewidth, power, stability, polarization)?
Core performance parameters are: - Center wavelength: 852 ± 0.2 nm (thermally tunable by ~0.3–0.4 nm in total) - Output power (fiber): up to 200 mW typ., 100 mW guaranteed - Operation mode: CW, single-frequency, single-longitudinal-mode - Linewidth: < 20 kHz (typical, measured over a suitable time scale comparable to similar single‑frequency fiber lasers) - Beam quality: M² typically 1.05 (≤ 1.1), essentially diffraction‑limited - SMSR: ≥ 30 dB (typ. 40 dB), ensuring clean single‑mode operation - Polarization: linear, with polarization extinction ratio ≥ 18 dB (typ. 20 dB) - Output power stability: typically ±1% peak‑to‑peak (max ±2%) over the specified time/temperature range - Output power tuning range: 30–100% of rated power via front‑panel or remote control. These figures are in line with other premium 852 nm single-frequency and metrology‑grade lasers offered worldwide for atom cooling and clock applications.
Is the 852 nm single frequency fiber laser suitable for cesium atom cooling, atomic clocks, and other quantum optics experiments?
Yes. The laser is specifically designed for cesium D2 line applications around 852 nm and is recommended for: - Cesium atom cooling and trapping (MOT and optical molasses) - Cesium atomic clocks (interrogation and optical pumping) - Rydberg atom excitation and spectroscopy (as a stable pump or reference beam) - Quantum measurement experiments requiring narrow linewidth and low phase noise - General cold atom and precision spectroscopy experiments. Its ultra‑narrow linewidth, low noise, linear polarization, and high spatial mode quality are exactly the characteristics required in published cesium cold‑atom and Rydberg experiments. Users typically combine such a source with AOMs/EOMs and frequency locking to atomic references or ultra‑stable cavities to build full experimental systems.
How can I tune and modulate the wavelength and power of the CoSF-FC-852 laser?
The laser provides both slow thermal tuning and optional fast PZT tuning: - Thermal wavelength tuning: 0.3–0.4 nm total range around 852 nm, with a fine tuning resolution of approximately 0.1 pm via temperature control. This is used for coarse alignment to the Cs D‑line transitions or cavity modes. - PZT wavelength modulation (optional): if the PZT option is ordered, you can modulate the wavelength at linear frequencies from DC up to 20 kHz, with a modulation span of about 10–15 GHz. This path is commonly used for frequency scanning and for generating error signals in Pound–Drever–Hall (PDH) or similar locking schemes. - Power tuning: electronic control allows adjustment of output power from about 30% to 100% of nominal, enabling intensity scans and optimization of atom loading or clock signal contrast. Control is typically available from the front panel on benchtop units and via the RS‑232 interface for integration and automation, in line with how other single‑frequency fiber lasers are controlled in laboratory and OEM environments.
What output options, fiber type, and connectors are available for the 852 nm single frequency fiber laser?
Standard output is via polarization‑maintaining fiber, optimized for 852 nm: - Output fiber type: PM780 (a commonly used PM fiber for 700–900 nm wavelengths) - Fiber length: >0.5 m standard - Connector: FC/APC to minimize back‑reflections into the laser - Output polarization: linear, aligned to the slow axis of the PM fiber. Ordering codes also allow: - FA: FC/APC fiber output (standard) - COL: free‑space collimated output option for direct beam delivery This matches practices seen on similar commercial 852 nm and 780 nm fiber lasers, giving users the flexibility to stay entirely fiber‑coupled or to interface with free‑space optics for MOTs, optical lattices, and spectroscopy setups.
What are the electrical, mechanical, and environmental requirements for operating the CoSF-FC-852 laser?
Typical operating conditions are: - Supply voltage: AC 100–240 V, 50/60 Hz (universal input for benchtop configuration) - Communication: RS‑232 interface for remote monitoring and control - Operating temperature: 0 to 40 °C - Storage temperature: –20 to 60 °C - Form factors: benchtop unit or module (select B or M in the part number) - Benchtop dimensions: approx. 510 × 480 × 150 mm. The laser should be used in a clean, low‑vibration laboratory or system environment for best spectral performance, similar to other ultra‑narrow single‑frequency sources. Adequate thermal management and avoidance of strong acoustic or mechanical disturbances will help maintain the specified linewidth and power stability.
How do I specify and order the right configuration of the CoSF-FC-852 for my application?
Use the ordering code format: CoSF-FC-852---PZT-FA/COL where: - P: Package type, B for benchtop, M for module - PW: Output power rating, e.g., 0050 for 50 mW, or as specified in the product options up to the 200 mW class - PZT: Indicates inclusion of the fast PZT wavelength modulation option (omit if not needed) - FA: FC/APC fiber output (standard PM fiber output) - COL: Free‑space collimated output. For example, “CoSF-FC-852-B-0100-PZT-FA” would denote a benchtop 100 mW unit with PZT fast modulation and FC/APC PM fiber output. When selecting a configuration, consider required power at the atoms or experiment, need for fast frequency scanning/locking, and whether your system uses fiber delivery or free‑space beams, as is standard practice when choosing equivalent 852 nm or 780 nm single‑frequency sources on the market.

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