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Options for Laser Diode Systems
Due to customers request special modifications to our standard laser modules have found their way into our list of standard options. For remaining questions we are anxcious to be called upon.
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NOTE: NOT ALL OPTIONS ARE AVAILABLE ON ALL MODELS. OPTIONS ARE NOT AVAILABLE IN ALL COMBINATIONS. IF MULTIPLE OPTIONS ARE REQUIRED, PLEASE CONSULT WITH US FOR COMPATIBILITY
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Digital Control Options
The Digital Control Option allows the operator to precisely calibrate the lasers, store a setting in the unit's memory and retain it for future use. With this added level of control come several benefits. The stability of the system is greatly improved as well as protection of accidental misadjustment as with a manual potentiometer possible is prevented. Thus the system can more easily maintain compliance with safety regulations. It also eliminates the need to physically handle the system and risk unfortunate misalignment in sensitive installations.
Using this interface the system is not only digitally controllable but the control signals are also TTL compatible. The options D1 - D3 allows adjustment with 100 positions between it's minimum and maximum settings.
Option D1: Constant Optical Output Power Control
The Optical Power Digital Control Option is a digital interface between the laser diode drive circuit and a controller supplied by the customer. Unique in the industry, this interface replaces the standard mechanical potentiometer normally used to adjust the optical power output of the laser diode. The optical power of the system is monitored and adjusted using the current feedback signal from the laser's back-facet monitor diode.
Safety and reliability of the system are enhanced. By eliminating the easy access to the power adjustment, the laser is protected from inadvertent excessive power adjustment and laser diode burnout. Options D1 and D2 are NOT available together.
Option D2: Constant Drive Current Control
The Constant Current Digital Control Option is a digital interface between the laser diode drive circuit and a controller supplied by the customer. It replaces the usual mechanical potentiometer utilized to adjust the drive current of the laser diode.
Options D1 and D2 are NOT available together.
Option D3: Digital Temperature Control
The Thermoelectric Digital Control Option is a digital interface between the Peltier drive circuit and a controller supplied by the customer. It allows the operator to precisely calibrate the operating temperature of the laser, store a setting in the unit's memory and retain it for future use. This interface replaces the standard mechanical potentiometer used to adjust the case temperature of the laser diode. The case temperature of the laser diode is monitored and adjusted using the feedback from a temperature sensor attached to the laser diode housing.
Option D4, D5, D6: High Resolution Digital Control
For some of our systems a Digital Pot Module (DPM) is available, either as an option or as standard equipment. This device is designed as replacement for conventional potentiometers in analog circuits. Each option is capable of 256 or 512 positions between the minimum and maximum settings. This represents an increase of over 5 times the resolution versus the D1, D2, and D3 options. The DPM settings are maintained in non-volatile memory and return to their last programmed position upon power-up.
The Digital Pot Controller software is compatible with all of our digital options. Connection to the PC is through the standard parallel (printer) port. Control of the laser with I/O lines from user provided on board micro-processors can be available on request. The DPMs are selectable at the factory with the following configurations:
- D4/ D4b Constant Optical Output Power Control
- D5/ D5b Constant Drive Current Control
- D6/ D6b Digital Temperature Control
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X-Options
X-Options allow the user to select the type of adjustments or settings that control a laser system.
X Options for Adjustment
These options typically apply to the laser diode power supplies LDP201 (150 mA) and LDP251 (1 Amp) diode laser driver utilized, but may be compatible with other systems. Please consult for compatibility. For a higher degree of control, we suggest a 12 turn pot. External pots are connected by 12 inch (25.4mm) wires.
- X11 - X16 Constant Optical Output Power Mode Control
- X21 - X26 Constant Drive Current Mode Control
- X41 - X46 Temperature Control
X Option user programmable Crystal Trigger
Option X34 may be added to any model ending with the letter X (ie. APMX or PPMX) to allow the user to externally select any one of the frequencies listed in the Option X34 specification. It is utilised to externally step the internal crystal's dividing ratio and change the fixed frequency at which the laser modulates. Without Option X34, the modulation frequency for all "X" systems is set at the factory. A fixed frequency for laser modulation must be chosen when a system with number ending in X is ordered. The frequency must be specified at order placement. The crystal oscillator/ programmable frequency divider provides frequency stable modulation with 0.015% stability.
All frequencies generated are derived from a single built-in quartz crystal oscillator and exhibit the same high levels of accuracy and stability as those of the base frequency supplied by the crystal. Other frequencies are available upon request.
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Optical Options for Laser Diode Systems
A variety of optical options and lenses are available for our diode laser modules. Since not all options can be utilized with all models, this information provided is mainly intended for optical engineers. We highly recommend our assistance for your specification of options. Wavefront Analysis is available upon request with module purchase as well as Collimation Analysis to 1/50th of a wave. Matched prism pairs are only utilised in ACM and APM modules in combination with an astigmatic lens and a glass aspheric lens to circularize the laser output beam.
Polarization Indicator
Beams are typically linearly polarized with a ratio between 30:1 and 300:1. Direction of the S and P polarization vectors can be indicated on the laser module on request.
Glass Lens Options
Our G option lenses are aspherics made from high quality optical glass with anti-reflection coatings and focal lengths from 2mm to 18mm. The G3 lens is standard for most modules, but other lenses may be substituted. Substituting lenses may change the units price. Our standard lens, G3, is a high quality glass lens that is suitable even for most commanding applications. For other lenses please refer to our specification area.
Line Generating Lens Options
Our L option lenses are Cylindrical Lenses typically made from BK7 optical glass with anti-reflection coatings. Several angles of divergence are available. Fan angle statements are relates only to single mode lasers.
Plastic Optics
A high quality, low cost plastic lens is used in the RS and LPM models.
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Fiber Optic Options
Single-Mode and Multi-Mode Fiber Optic coupling is available. Collimating distal lenses are also available upon request.
Single-Mode
For single mode fiber we recommend 4µm for wavelengths between 635nm and 670nm, and 9µm for wavelengths between 700nm and 1300nm. All single mode fiber couplings are permanently attached and can be ordered with any length of fiber. The fiber is terminated with a FC fiber optic connector.
Multi-Mode
For multimode fiber applications we recommend 50µm fiber for most wavelengths. The fibers can be terminated in a ST, FC, or SMA connector. All fibers are permanently attached to the laser. If the application requires several different fiber lengths, a coupling that has a SMA bulkhead on the laser system can provide.
Please contact with us for all fiber optic pigtail assembly pricing. Price is dependant on wavelength, fiber length, and connectors.
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Beam Expanders / Telescopes
Telescope Collimators are used to reduce, enlarge or collimate output beams. They may also be used to focus to small spots at long distances
Several Beam Expander options are available all based on the Galilean design. This design provides the user with an easy to aim, non-inverted image that is highly collimated.
Each telescope comes with laser quality optics (¼ Wavefront) AR coated for 630nm to 930nm. Optional AR coatings for 1300nm to 1600nm are available upon request. The maximum input diameter is 4mm. TC, TC2, and TC3 can also be used to focused a spot 250µm diameter at 2 meters.
Telescopes are optional on the following systems: PM, APM, ACM, PPM and all modulated versions of these (except the PMT).
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