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A. Outline

Excellent Stability, Fast Modulation Capability, Simple and Inexpensive Construction

Featuring low current noise, excellent DC stability, and high-speed modulation capability, the new strait spectrum diode laser current controller is the best laser driver among diode laser drive controllers available on the market today.Excellent Stability, Fast Modulation Capability, Simple and Inexpensive Construction

Featuring low current noise, excellent DC stability, and high-speed modulation capability, the new strait spectrum diode laser current controller is the best laser driver among diode laser drive controllers available on the market today.

Semiconductor diode lasers have recently become an effective tool in many areas of scientific research as an inexpensive tunable monochromatic laser source.

Laser frequency and output power depend on both diode junction temperature and injection current, so stable laser operation requires precise adjustment of these quantities.

The ability to rapidly modulate the injected current is also needed to fix the laser frequency to some fixed value (e.g., near the atomic resonance line) or to add a frequency sideband to the laser output. For example, the frequency variation of a free-running diode laser is

The frequency change due to the injection current is typically 3 MHZ/PA.

On the other hand, feedback from an external grating drops to -0.3 MHZ/PA. Thus, to tune the frequency of a free-running laser, a current stability of 1 PA is required to tune the frequency of the laser to a fraction of its linewidth.

To achieve a line width of 100 kHz, a current noise of less than -300 nA rms is required, and an accuracy of less than 300 nA rms is needed. Our thermo-module temperature controller system is sufficient to achieve the required low noise and stability.

 Performance limits are usually related to the physical separation between the detection and temperature control points.

However, we found that there is room for improvement with respect to the laser current control circuit. In this LD driver, a new diode laser current controller that combines high stability with low current noise and easy modulation, this controller is a significant improvement over previous circuits, and despite its simplicity, it is the best commercially available current controller available today with ultra-low noise LD driver has now been created.