A Ø9 mm laser diode can be directly installed into the tube with the included retaining ring, while a Ø5.6 mm laser diode can be installed with the use of the included adapter kit. The SPW301 spanner wrench can be used to install any of our Ø5.6 mm or Ø9 mm laser diodes in the collimation tube. However, the lens in these collimation tubes is not meant to be replaced. The large travel range of the optic ensures that these collimation tubes can be used to collimate any of Thorlabs' laser diodes that emit within their AR coating range. The lens translates inside the tube without rotation for enhanced pointing stability. Rotation of the cap by 5° corresponds to a linear displacement of the lens by 5.5 µm, and an engraved scale on the actuating cap allows for accurate lens positioning. The position of the lens can then be locked using the external locking ring. The position of this lens can be adjusted by up to 2.5 mm (0.1") by rotating the cap on the end of the tube. Thorlabs' Adjustable Laser Diode Collimation Tubes are shipped with an aspheric lens (collimation optic) premounted. Laser Diode Retaining Ring Compatible with SPW301 and SPW801 Spanner Wrenches.Ø15 mm (Ø0.58") Tube Can be Mounted Using a Ø1" AD15NT Adapter or SM1-Threaded AD15F or AD15F2 Adapters.Includes Main Tube with Mounted Optic, Retaining Ring, and Adapter Kit for Ø5.6 mm Diode Packages.Rotating Cap with Locking Ring Provides 2.5 mm (0.1") of Lens Travel for an Adjustable Focus.Aspheric Collimation Optic with One of Three Broadband AR Coatings:.13/32"-40 Threaded Retaining Ring Secures Ø5.6 mm or Ø9 mm Laser Diode.Adjustable Lens Mount with Collimating Optic for our LD Sockets with Strain Relief Cables (Sold Below).Includes a factor of 1.56, which accounts for the portion of the beam measured between the 10% and 90% intensity points being smaller than the 1/e 2 beam diameter.Īdjustable Laser Diode Collimation Tubes are Compatible with SR9 Strain Relief and ESD Protection Cables For a small Gaussian-shaped beam (Figure 4), a first approximation of the 1/e 2 beam diameter ( D ), The arc length ( Rθ = R ⋅ ft r ) through the beam can be calculated using this angle. The angle ( θ = ft r ) subtended by the beam depends on the signal's rise time (Figure 3) and the wheel's rotation rate ( f ), whose units are Hz or revolutions/s. To make this beam size measurement, the combined response of the detector and oscilloscope should be much faster than the signal's rate of change. A point on the blade located a distance R from the center of the wheel sweeps through an arc length ( Rθ ) that is approximately equal to the size of the beam along this direction. When the blade sweeps through the angle θ , the rise or fall time of the S-curve is proportional to the size of the beam along the direction of the blade's travel (Figure 2). As the rotating chopper wheel's blade passes through the beam, an S-shaped trace is displayed on the oscilloscope. The rise time depends on the wheel's rotation rate and the beam diameter.Ĭamera and scanning-slit beam profilers are tools for characterizing beam size and shape, but these instruments cannot provide an accurate measurement if the beam size is too small or the wavelength is outside of the operating range.Ī chopper wheel, photodetector, and oscilloscope can provide an approximate measurement of the beam size (Figure 1). Figure 3: Rise time ( t r ) of the intensity signal is typically measured between the 10% and 90% points on the curve.
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