THORLABS LM14S2, Руководство пользователя

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Butterfly Laser Diode Mount Chapter 5: Operation
Page 10 10614-D02
RF Voltage = (Laser Diode Modulating Current) * 50 Ω
It is strongly recommended that you start off conservatively by a factor of 10 below the calculated modulating
voltage and slowly bring the RF power up until the desired depth of modulation is reached.
Use the laser controller to establish the DC operating point of the laser.
WARNING
The RF input is directly coupled to the laser. Any excessive transients or noise will be coupled into
the laser, and may cause the laser to be overdriven. Also, the laser can be easily overdriven if
excessive RF power is applied to this input. Use the RF modulation with care to avoid damaging your
laser.
5.2. Status and Interlocks
This unit is equipped with two interlock circuits and an LED that indicates if the laser diode is enabled. All three
circuits are designed to interface with Thorlabs’ laser and TEC controllers with no external circuitry.
If third-party controllers are used to drive the laser diode or TEC elements then ONLY the LD ON indicator can be
used. To prevent damage to the Status and Interlock circuits, the following external connections should be
followed:
1. Install the shorting device into the REMOTE INTRLK connector that was shipped with the LM14S2.
2. Set the TEC Lock switch on the bottom of the unit to “Bypass”.
3. Connect a resistor to LD Interface DB9 Pin 1 that is appropriately sized to limit the current into Pin 1 to
between 5 and 10 mA.
4. The “driver” side of this resistor should be connected to a DC signal that, when high, indicates that the
laser diode is being driven.
If you have any questions regarding these connections, or if you wish to make full use of all the Status and
Interlock features with your third party drivers, please contact Thorlabs Tech Support.
5.3. Maintaining the LM14S2
There are no serviceable parts in the LM142. The housing may be cleaned by wiping with a soft damp cloth. If
you suspect a problem with your LM14S2, please call Thorlabs Tech Support and an engineer will be happy to
assist you.