External Cavity Diode Lasers

Stretto: High precision external-cavity diode lasers from ultraviolet to infrared

Discover the groundbreaking Stretto, a key member of the PureLight family, offering advanced, high-performance narrow linewidth photonic solutions. Drawing inspiration from the musical term “stretto,” this innovative tunable laser is synonymous with precision and intricacy, echoing the principles of quantum entanglement through its remarkable performance and narrow linewidth.

Versatile and Scalable Wavelength Range

Stretto stands out in the quantum technology market with its extraordinary capability to cover wavelengths from UV to infrared. This feature is essential for researchers and OEMs looking to scale their quantum experiments or integrate systems without the hassle of redesigning. Stretto’s adaptability makes it a top choice for tunable laser technology.

Designed for Durability and Easy Integration

Emphasizing manufacturability, Stretto is designed for seamless OEM integration and efficient volume production scaling, thanks to its semi-automated manufacturing process. This makes Stretto a go-to laser solution for industries requiring high precision and reliability.

Unrivaled Performance in Harsh Environments

Developed with Daylight’s core commitment to quality of light and high performance, Stretto is not just any external cavity diode laser (ECDL). It’s a rugged, compact, and lightweight solution, engineered to withstand extreme conditions. Unlike typical ECDLs, Stretto excels in environments that challenge other lasers, setting a new standard in rugged laser technology.

Stretto’s hermetically sealed design makes it ideal for use in diverse settings, including humid, dusty, or vacuum-compatible environments. Its resilience to shock and vibration ensures unwavering performance even in the most demanding conditions.

The Stretto Advantage in Quantum Systems

Key Benefits for Quantum Technology

  • Resistant to temperature and pressure fluctuations
  • Stable under extreme shock and vibration
  • Large mode-hop-free tuning range, exceeding 70 GHz

Stretto is more than just a high-precision laser. It’s a testament to the fusion of advanced engineering and adaptability in quantum technology. Ideal for use in quantum sensors, clocks, and computing systems, Stretto is a symbol of innovation, reliability, and versatility in the world of tunable lasers.

For those at the forefront of quantum research and applications, Stretto offers an unmatched combination of precision, flexibility, and resilience. Embrace the future of quantum technology with Stretto, the ultimate choice in high-precision tunable lasers.

Why use a laser for quantum technologies?

Lasers are not just tools. They are the backbone of quantum information technology and Quantum 2.0 scalability. Their unparalleled precision, adaptability, and control make them indispensable for quantum computing, communication, and metrology.

Precision Control for Quantum Computing

Lasers are the cornerstone of several modalities of quantum computing, offering unmatched control and manipulation of quantum states. Whether it’s initializing, manipulating, or reading out the quantum states of qubits, lasers provide the precision and coherence needed for the sophisticated operations of quantum gates. This is especially crucial in systems like trapped ion quantum computers, where lasers finely tune the internal and motional states of ions.

High-Speed Quantum Communication

In the realm of quantum communication, lasers are pivotal. They facilitate high-speed information transfer, essential for cutting-edge quantum key distribution (QKD) methods. With lasers, secure quantum information can travel vast distances, whether through free space or along fiber optic paths, ensuring high levels of security in data transmission.

Laser Cooling and Trapping: The Key to Stability

Lasers excel in cooling and trapping particles, a vital process in maintaining stable quantum states. Techniques like laser cooling bring atoms to near absolute zero temperatures, significantly reducing environmental noise and decoherence – common challenges in quantum systems.

Scalability and Integration for Quantum Networks

Several groups have demonstrated working prototypes across the spectrum of quantum sensing and timing, computing, and networking. The industry is now ready to enable what’s next: implementation of scalable designs and commercialization of products.

As we venture into more complex quantum networks, lasers provide the scalability and integration necessary. Their precise tuning and targeting capabilities are ideal for individually addressing qubits in expansive quantum systems, paving the way for practical and scalable quantum computing and networking solutions.

Adaptability for Diverse Quantum Technologies

Lasers stand out for their adaptability. With a range of wavelengths, powers, and pulse durations, they are perfectly suited to meet the diverse requirements of various quantum technologies. This versatility is essential in tailoring lasers to the specific needs of different quantum systems, from atoms and ions to solid-state qubits.


Features & Benefits

  • Wide Wavelength Coverage: From 369 nm to 1800 nm, with options for free space and fiber-coupled outputs
  • Superior Frequency Tuning: Offering mode-hop-free tuning over > 50GHz
  • Ultra-Narrow Linewidth: Achieving a free-running linewidth of  100 kHz and closed-loop linewidths of < 1 kHz
  • Ease of integration: World-class current, piezo and temperature driver noise performance, combined with well-characterized servo behavior enables customers to lock the Stretto to their reference quickly and with confidence.


  • Optical ion traps and ionic spectroscopy
  • Optical atomic traps
  • Quantum Information Systems
  • Atomic clocks
  • Defect and color center quantum sensors

Product Specifications


Typical power range 10 – 300 mW (model dependent)
Typical mode-hop free tuning range  ≥ 50 GHz
Typical free-running linewidth (5 µs integration time) 100 kHz FWHM
Typical output beam characteristics Fiber-coupled: SM/PM fiber
Free-space: Circular, 1 mm FW @ 1 e2 diameter
Typical output beam polarization Fiber coupled: > 18 dB PER
Free-space: Linear > 20 dB PER
Optical isolation 30 – 35 dB (integrated)
Dimensions laser head (H x W x D) 8.8 x 4.8 x 2.3 inches (220 x 120 x 58 mm)
Weight laser head 7 lb (3.2 kg)
Dimensions control unit (H x W x D) 11.5 x 7 x 2.3 inches (290 x 180 x 58 mm)
Weight control unit 1 lb (0.4 kg)
Power supply 100 – 240 VAC (50/60 Hz)
Power consumption Typ. < 35 W
Interface Ethernet and USB 2.0/3.0 networking
Analog servo control outputs
Windows® 10/11 GUI and full SDK
(Supports Python® / C++ / Labview®)
Environmental temperature 15 – 30°C (operating)
-40 – 70°C (storage / transport)
Environmental humidity  95% non-condensing


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