Sciencetech's FB-QTH-3 fiber optic illuminator can fully light a fiber bundle with a diameter up to 13 mm (with appropriate adapter) and a maximum numerical aperture of 0.45 (f/1). A QTH lamp with dichroic elliptical reflector and a folding dichroic mirror allow maximum throughput with very efficient elimination of infrared radiation.

Optional optics allow the insertion of 1" interference filters with low beam divergence at the position of the filter.

IR Ellimination also Reduces Significant Power
The FB-QTH-3 has a built-in IR dichroic reflector that eliminates all IR thermal light from the output light beam. This removal results in only light power within the UV and visible spectrum. If total power is important, this built in IR dichroic reflector can be replaced with a regular reflector to keep the IR light in the light beam. With this change in reflector, the total amount of light power exiting the light source can be increased significantly. Please contact a Sciencetech Application Specialist for measured power levels with this reflector change.

Fiber Bundles Sold Separately
Please see Sciencetech's selection of Fiber Bundles that can be purchased with this QTH Fiber Illuminator. Since the QTH is mainly limited to the visible range, a glass fiber of 8mm or 1/2" diameter is most recommended.

Standard 150W QTH Lamp
The QTH Fiber illuminator has a 2-pin GX5.3 lamp socket base which supports Ushio QTH lamps with built-in reflectors. The standard QTH Fiber Illuminator supports the following 150W Ushio QTH lamps with a built-in MR-16 dichroic reflector. If none is specified, the standard illuminance version defined below is supplied.

• High Illuminance - EJV, JCR21V-150W with 40 hours (1500 Lux)
• Standard Illuminance - EKE, JCR21V-150W with 200 hours (900) Lux

Optional 100W and 200W QTH Lamps
The QTH Fiber Illuminator can also be reconfigured to support different wattage Ushio QTH lamps with built-in reflectors. Although their lamp socket base is the same 2-pin GX5.3, their voltage requirement and working distances are slightly different meaning modifications to the QTH Fiber Illuminator is required. Please note this issue with Sciencetech when ordering a different wattage lamp.

• 200W Lamp - EJK, JCR24V-200W with 50 hours (1,100 Lux)
• 100W Lamp - EMC, JCR12V-100W with 200 hours

Built-In Power Supply
The QTH Fiber Illuminator has a built in DC power supply to illuminate the lamp. The power level setting is generally fixed, but there are four fixed settings available. The adjustment knob on the low left of front panel has four positions to control the lamp power. In the OFF position, the supply is powered on, but no power is delivered to the lamp. The ALIGN position puts a nominal amount of power to the lamp to facilitate the alignment of coupling optics with lamp voltage of 10V. At the LAMP SAVE position, the voltage is 14.5 V, which extends the lamp’s lifetime more than 100 times longer than the nominal lifetime. The FULL POWER position runs the lamp in the voltage of 17 V, with a lifetime about 10 times longer than the nominal lifetime of the 150 W lamp.

Technical Specifications

• illuminate fiber bundle up to 13mm diameter
• maximum fiber numerical aperture of 0.45 (f/1)