The QTekLaser™ 532 nm Fiber Laser is a green-wavelength system using second-harmonic generation (SHG) to deliver stable, narrow-linewidth (<20 kHz), polarization-maintaining light up to 14 W, making it ideal for laser cooling and trapping. <1% power stability and an IoT-enabled interface in a compact 4U 19" rack-mount chassis allow for seamless integration.
QTekLaser™ offers laser systems with extended wavelength range by combining nonlinear frequency conversion technologies. Through second-harmonic generation (SHG) we achieve significant laser power at the visible and NIR regime (figure 2; red-shaded cells of table 1). With the development of periodic poled crystal technology and the associated waveguide technology, nonlinear frequency conversion has become a powerful tool to extend the application scope of fiber lasers. For QTekLaser™ products, the max power of the converted laser light is constrained by the damage threshold of commercially available nonlinear crystals, which is typically several tens of watts.
QTekLaser™ lasers comply with Federal Regulations (21 CFR Subchapter J, Part 1040) as administered by the Center for Devices and Radiological Health and are certified to IEC 60825-1:2014 standards.
The 532 nm fiber laser — with ultra-narrow linewidth (< 20 kHz), low relative intensity noise (-135 dBc/Hz>10 kHz), and polarization-maintaining, high beam quality output — is a compelling tool for quantum science platforms. At visible wavelengths, it enables resonant or near-resonant manipulation of atomic transitions (for species where green light is used) and can augment cooling, state preparation, or optical pumping steps. Its compact, stable, SHG-based architecture ensures that the delivered beams remain spectrally and spatially stable over long experimental runs, which is critical to preserving coherence in quantum systems.
In neutral atom architectures that use green transitions (for example, in certain cooling or state-preparation stages), this 532 nm source can serve in optical molasses, polarization gradient cooling, or repumping. After initial laser cooling stages, the same laser can be used for state preparation or shelving pulses before qubit operations. Moreover, when combined with intense far-off-resonance trapping beams (from, say, 1064 nm), the 532 nm beams can create state-dependent potentials or light shifts to control internal states. The narrow linewidth and precise frequency control reduce off-resonant scattering and phase noise, preserving qubit coherence during manipulations.
For entanglement protocols or multi-qubit gates, 532 nm beams may drive Raman transitions or sideband couplings in hybrid schemes, or provide fast local addressing for individual qubits via tightly focused beams. Their stability limits technical noise that might otherwise degrade gate fidelities. In quantum sensing or metrology contexts, the 532 nm laser can also play a role in state readout, fluorescence excitation, or probing atomic transitions with minimal perturbation. Overall, a high-performance 532 nm fiber laser is a versatile enabler in quantum computing stacks, not just for cooling and trapping but for precision state control and readout.
