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C-Mount Laser Mount with Temperature Stabilization![]()
LDMC20 Application Idea LDMC20 with C-Mount Laser and C037TME-E Lens in a S1TM09 Adapter Related Items ![]() Please Wait ![]() Click to Enlarge Figure 1: LDMC20's Mounting Platform and Copper Heat Sink ![]() Click to Enlarge Figure 2: Side View of the LDMC20 Features
Thorlabs' LDMC20(/M) C-Mount Laser Mount is designed to work with our line of Fabry-Perot (FP) and Distributed Feedback (DFB) C-mount semiconductor lasers. Internal electronics provide active temperature stabilization capable of dissipating heat loads of at least 20 W at 25 °C, making this mount ideal for temperature-controlled operation of C-mount lasers. The C-mount laser is mounted against a copper heat sink and held in place by a cap screw included with the mount (see the Installation tab for assembly instructions). The LDMC20(/M) is compatible with select single-tab and dual-tab laser configurations; please refer to the Specs tab for diagrams of compatible C-mount devices. A TEC control circuit provides a stable temperature environment for the laser and the mount is air cooled, utilizing an automatic fan speed control to actively cool the heat sink. The fan is vibrationally isolated and designed to run only as needed for temperature stabilization so as to minimize vibrational coupling. When combined with proper current control, the mount can be used to stabilize or tune the laser's wavelength. The fan can be run via an external power supply (included with the mount) if the TEC driver being utilized cannot supply power to the fan. The laser is held in the mount such that the emission facet is nominally centered in the SM1-threaded (1.035"-40) port. This port is intended for mounting aspheric lenses for collimation purposes, using the proper adapter and lens. Z translation is achieved by rotating the adapter in the SM1 port with a spanner wrench. A pair of knurled knobs provides fine X-Y translation of this port so that the emitted laser beam can be precisely centered within it. This makes centering the laser beam onto collimating optics quick and easy. The translation is accomplished through the utilization of a flexure design. The front cover plate of the LDMC20 is equipped with eight 4-40 tapped holes for our 30 mm or 60 mm cage systems. Laser protection features include optional grounding configurations, and the TEC Lockout circuit* that prevents enabling the laser unless the TEC controller is active. The built-in thermoelectric cooler enables temperature-controlled operation of the laser diode. *TEC Lockout only functions with Thorlabs' current and temperature controllers and can be easily bypassed if not required. Recommended Current and Temperature Controllers The LDMC20 mount ships with current and TEC cables that are compatible with all of our LDC current controllers and ITC dual current and temperature controllers, including the ITC4002QCL and ITC4005QCL. Handling C-Mount Lasers Unlike TO can and butterfly packages, the laser chip of a C-mount laser is exposed to air; hence, there is no protection for the delicate laser chip. Contamination of the laser facets must be avoided. Do not blow on the laser or expose it to smoke, dust, oils, thermal grease, or adhesive films. The laser facet is particularly sensitive to dust accumulation. Do not use thermal grease with this package, as it can creep, eventually contaminating the laser facet. Acceptable alternatives to thermal grease include pyrolytic graphite and solder.
![]() Click to Enlarge LDMC20 Mechanical Drawing Supported C-Mount Laser Configurations![]() Click to Enlarge Incompatible C-Mount Laser Configurations![]() Click to Enlarge ![]() Click to Enlarge The graph above shows the heat dissipation of the LDMC20 with the fan turned off. Data was taken at three different ambient temperatures. ![]() Click to Enlarge The graph above shows the heat dissipation of the LDMC20 with the fan turned on. Data was taken at three different ambient temperatures. ![]() Click to Enlarge The graph above shows the resistance value of the LDMC20's thermistor as a function of temperature. For this thermistor, β = 3984. ![]() Click to Enlarge Figure 1: To begin installation, use a balldriver to remove the four socket head screws from the front face. The LDMC20 utilizes 6-32 screws, which can be removed using the included 7/64" hex key, whereas the LDMC20/M has 2-56 screws and uses the included 5/64" hex key. ![]() Click to Enlarge Figure 2: Carefully insert the C-Mount laser into position within the mount. Using a 5/64" balldriver, secure the laser with the 2-56 socket head screw. ![]() Click to Enlarge Figure 3: The black plastic brackets seen above are used to ensure proper electrical contact between the C-Mount's tabs and the LDMC20. Using a 3/32" balldriver, tighten the two 4-40 socket head screws until the tabs are held securely against the small copper blocks. These screws only need to be snug. Do not overtighten as it can cause damage to the mount or laser. For single-tab C-Mount lasers, the included 4-40 screw and washer needs to be set into either the "Anode To Body" or "Cathode To Body" location (dependent on laser configuration) indicated by the red circles. ![]() Click to Enlarge Figure 4: Replace the front face of the mount. ![]() Click to Enlarge Figure 5: Install the desired lens and adapter. This image shows the LDMC20 with a C037TME-E aspheric lens with an S1TM09 aspheric lens adapter. The SPW909 can be used to insert the adapter into the SM1-threaded port. This port is intended for mounting aspheric lenses for collimation purposes, using the proper adapter and lens. A pair of knurled knobs provides fine XY translation of the port so that the beam can be precisely centered, while Z translation is achieved by rotating the adapter in the SM1 port with the spanner wrench. For optimization in Z, rotate the assembly by 1/4 or 1/2 turn at a time, and then check the beam quality (preferably by using a camera) some distance away from the LDMC20(/M). Caution: Optimization in Z should be done with care. Over-rotating the assembly may cause contact between the lens assembly and the C-mount laser, which can result in damage, especially if the laser is operating. Please refer to Section 5.6 in the manual for more information. Laser Pin Connections7W2 Mixed Female D-Sub Jack
TEC Pin Connections7W2 Mixed Male D-Sub Jack
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