Thorlabs’ DBR85TK and DBR89TK lasers are turnkey, low-noise laser systems that integrate their DBR852PN or DBR895PN Distributed Bragg Reflector (DBR) laser diodes with a high-performance, low-noise driver and temperature stabilization inside of a benchtop housing. The DBR85TK is centered at 852.35 nm, corresponding to the D2 atomic transition line of cesium (Cs), while the DBR89TK is centered at 894.6 nm, aligned with the D1 transition line of cesium. The temperature of the laser case is stabilized through a third temperature stabilization circuit to provide long-term power and wavelength stability when the system is used in standard laboratory environments.
At-a-Glance:
- Single-Frequency Turnkey Laser Systems
- Wavelengths Targeting Cs at 852 nm (D2) or 895 nm (D1)
- 2.4 nm Temperature Tuning Range
- 25 GHz DC Current Modulation Tuning Range (Typical)
Performance:
- Central Wavelength of 852 nm or 895 nm
- >22 mW Output Power at the Cs D2 (Item # DBR85TK) Nominal Vacuum Transition, >13 mW Output Power at the Cs D1 (Item # DBR89TK) Nominal Vacuum Transition
- >25 or 22 GHz DC Current Modulation Tuning Range
- 2.4 nm Temperature Tuning Range
- <400 kHz Lorentzian Linewidth
- <-150 dBc/Hz Typical Relative Intensity Noise (RIN)
- 50 dB Typical Side-Mode Suppression Ratio (SMSR)
Features
- Turnkey Single-Frequency Laser Systems Targeting Cs Transitions
- Factory-Set to the Cs D2 (Item # DBR85TK) or D1 (Item # DBR89TK) Nominal Vacuum Transition
- Low-Noise Drive Electronics to Minimize RIN and Linewidth
- Analog Modulation Inputs for DC Current, AC Current, and Laser Temperature
- Integrated Isolator to Minimize Effects of Back-Reflected Light
- Remote Operation and Set-Point Adjustment with USB 2.0 Command-Line Interface or Software GUI
Applications
- Cesium Cooling
- Cesium Re-Pumping
- Neutral Atom Quantum Computing
- Cesium Rydberg States
- Cesium Spectroscopy
Thorlabs' DBR85TK and DBR89TK single-frequency, turnkey, low-noise laser systems integrate their DBR852PN or DBR895PN Distributed Bragg Reflector (DBR) laser diodes with a low-noise driver and temperature stabilization inside of a benchtop housing. To minimize the laser linewidth and relative intensity noise (RIN), these lasers include drive electronics that are designed to minimize the current noise. An isolator is integrated at the output of the lasers to minimize the impact of any back-reflected light on the lasers.
Each DBR85TK and DBR89TK system is factory-set with a drive current and temperature to provide over 22 mW and 13 mW of optical power, respectively, at wavelengths corresponding to atomic transition lines of Cesium. Each laser is shipped with a test data sheet taken at the preset operating conditions; click here for a sample data sheet. The wavelength and output power of these laser systems can also be tuned by adjusting the current or the temperature of the laser chip through either the analog ports on the front of the device or by sending a command through USB communication.
The optical outputs of these lasers are fiber-coupled via FC/APC bulkhead (2.0 mm narrow key) output connectors. We also offer turnkey versions of our Distributed Feedback (DFB) and Ultra-Low-Noise (ULN) single-frequency laser diodes at 1310 nm and 1550 nm, as well as turnkey versions of other Distributed Bragg Reflector (DBR) single-frequency laser diodes at 780 nm, 795 nm, and 1064 nm.
Remote Operation
Remote operation is also possible by connecting the laser to a PC (not included) via the USB port or 9-pin D-sub connector for RS-485 communication protocol on the back of the unit and using a command line interface. In addition to basic functions such as turning the laser on and off or reading status indicators, the command line enables the user to modify the laser operating set-points.
Applications
These lasers are designed with laser frequency locking applications in mind and can be used with our Saturated Absorption Spectroscopy System, as well as a Dichroic Atomic Vapor Spectroscopy Kit. In laser frequency locking, a frequency-tunable diode laser is split into counter-propagating pump and probe beams through a cesium vapor reference cell. This technique isolates narrow hyperfine transitions, known as Lamb dips, within the broader Doppler-broadened absorption profile, providing sharp error signals for laser frequency stabilization. By combining these lasers with modulation and feedback electronics, such as the DSC1 Digital Servo Controller and the PDB210A Balanced Photodetector, one can achieve robust, long-term frequency locking to the atomic transitions - an essential requirement for applications such as atomic clocks, laser cooling, and quantum sensing.
For further information, please contact