HESP-E-AO-PS Laboratory Diode Driver (For use with Kigre AO-1010 and AO-610 lasers) Kigre manufactures a laboratory laser diode driver for use with the AO-1010 and AO-610 actively Q-switched laser heads. The driver features precision pulsed current operation and supports the HESP family eye-safe laser diode requirements. A USB cable and software are provided so that the customer may use their computer as a laser controller. The driver accepts 90-240VAC, 50-60Hz AC Input for universal operation. The driver includes ultrahigh performance hold-up capacitors for stable pulsed current control up to 85 Amps. The driver features soft-start control, active current limiting, transient filtering, and a mechanical shorting relay provide robust protection for the laser. Power Input Pump Pulsewidth Output Current Range Pulse Repetition Rate External Fire Input Signal Photodiode (To) Output Signal Size (W x D x H) 90 240 VAC, 50-60Hz 3.6 ms 30-85A +/-0.5A 0 10Hz +5 V TTL +5 V Pulse 300x261x135 mm (11.8 x 10.3 x 5.3 inches) SET CURRENT DIAL = 80A FOR 80 AMP SETTING Printed: 3/16/15 Page 1 of 8 Revision # 1
KIGRE LASER CONTROL SOFTWARE Kigre laser control software provides a ready-made repetition rate generator with burst and shot count features. Use the cursor or keyboard to set the proper repetition rate for your laser. Use the cursor or keyboard to set the proper number of shots (burst count) for application. your Select START to begin firing the laser and STOP to stop firing the laser. You may stop firing the laser during a burst count-down at any time by pressing the stop button. The software provides a count-down of the remaining number of shots in the burst. The Kigre laser control software may be operated at any pulse repetition rate setting from 1 Hz to 10 Hz. Always set the current to the value specified by the laser test sheet and documentation. The HESP-E-AO-PS laser driver requires a computer for laser operation. Kigre does not supply a computer with the HESP-E-AO-PS laser driver. Printed: 3/16/15 Page 2 of 8 Revision # 1
DRIVER SPECIFICATIONS AC input voltage: 90-250 Volts AC (Auto-switching) AC input frequency: 50-60 Hz (Auto-switching) AC input current: 6A (Slo-Blo 5 x 20mm fuse located on rear panel) Pump diode current range: 30A 85A +/- 0.5A Frequency range: 0.1 10 Hz Laser diode forward voltage range: 0.7 16 Volts External trigger input: 4.5 5.5 V, 1.0 10mS Pulse into front panel BNC connector. 10Hz MAX. (input resistance is 100K-ohm). Rising edge of input signal fires laser. Power Supply Weight 6.33 Kg (13.94 pounds) Power Supply Size (H x W x L) 300x261x135 mm (11.8 x 10.3 x 5.3 inches) Estimated Temperature (operating): -30C to +50C Estimated Temperature (storage): -45C to +71C Estimated Shock (Mil-Std-810, 516): 70 G, 1.0mS Estimated Vibration (Mil-Std-810, 514) 10-55-10 Hz swept, 1 min; 762 um peak amp, 2hr, (120cycles) Power Inlet with Fuseholder: Qualtek Electronics Corp # 723W-X2/04 (IEC 320 - C14) Laser connector: Amphenol # 77TWA7W2S, Female Combo D-sub Mate to Laser connector: Amphenol # 717TWA7W2P, Male Combo D-sub Laser AO (RF) connector: SMA, Amphenol # 132170 Recommended AO (RF) cable: SMA-to-SMA, RG-316, 36-inches, Emerson # 415-0029-036 Control connector: USB 2.0 (backwards compatible to 1.0) SET CURRENT DIAL = TYPICALLY 80 AMPS FOR AO-1010 LASER Printed: 3/16/15 Page 3 of 8 Revision # 1
TYPICAL INSTALLATION Attach LASER here Attach USB CABLE here Attach SMA CABLE here Attach AC CORD here Note: The unit is rated for 90-250VAC, 50-60 Hz, 6A (max) input. The AC Inlet connector is a standard type (IEC 320-C14) often used by computers and other electronics equipment so you may be able to simply replace the cord to accommodate your country s AC outlet standard. If you prefer to attach a different AC plug on the existing cable: The black wire is AC-L1, the white wire is the AC-L2 (or neutral for 120VAC units) and the green wire is the Ground. Driver s LASER connector: Mate to Laser connector (laser cable): Amphenol # 77TWA7W2S, Female Combo D-sub Amphenol # 717TWA7W2P, Male Combo D-sub Pin A1: Laser pump diode current positive (Anode) Pin A2: Laser pump diode current return (Cathode) Pin 1, 2, 3 & 5: Not used Pin 4: Chassis ground (used for cable shielding) Laser AO (RF) connector: SMA, Amphenol # 132170 Recommended AO (RF) cable: SMA-to-SMA, RG-316, 36-inches, Emerson # 415-0029-036 Control connector: USB 2.0 (backwards compatible to 1.0) Printed: 3/16/15 Page 4 of 8 Revision # 1
TYPICAL OPERATION Laser Armed Status (On = Armed) SET CURRENT DIAL = 80A FOR 80 AMP SETTING ON/OFF Power Switch External Fire Input BNC Laser Sync Output BNC The Laser Sync Output signal is a 5V, 2mS pulse with the rising edge synchronized with the actual laser output. The output is intended to drive a 1M-ohm (one mega-ohm) scope input. Never attempt to monitor this signal with a 50-ohm low impedance scope input. The External Fire Input requires a 5 volt (+/- 0.5V), 1.0 10mS pulse into the front panel BNC connector. Input resistance is 100K-ohm. The laser fire circuit is triggered on the rising edge of this input signal. Never exceed 10 Hz for the Kigre AO1010 laser. Printed: 3/16/15 Page 5 of 8 Revision # 1
ACOUSTO-OPTIC Q-SWITCH AND RF DRIVER INFORMATION Acousto-optic Q-Switches are special modulators designed for use inside laser cavities. They have exceptionally low insertion loss and are able to withstand very high laser powers. An RF signal is applied to the Q-Switch causing it to deflect a proportion of the laser beam. This increases the cavity losses and prevents lasing. When the RF signal is switched off, the cavity losses decrease rapidly and the high peakpower laser pulse is emitted. The Kigre laser uses a Gooch and Housego AO Q-switch, model # 330 The Kigre driver uses a Gooch and Housego 80MHz, RF driver, model # MQH080-60DM-FPS. Printed: 3/16/15 Page 6 of 8 Revision # 1
TIMING DIAGRAM FOR KIGRE AO-1010 AND AO-610 LASERS LASER OUTPUT PULSE: 10Hz, ~10mj, 6ns Pump current is turned off 100uS after RF is turned off. Output pulse occurs approximately 800nS after RF is turned off. Laser RF input is 50-ohm impedance (Acousto-Optic crystal) 60W RF is approximately 155Vpp. LASER CONTROL PROCEDURE: 1) Send 100A, 1.80mS current pulse to pump diodes in laser. Red wire = Anode (+); Black wire = Cathode (-) 2) Simultaneously send a 1.79mS pulse of 60W, 80MHz RF power to AO crystal in laser. Center of SMA connector = Positive (+); Shield = Negative (-); Use RG-316 50-ohm coax. 3) Laser output pulse occurs approximately 800nS after the RF is turned off. 4) Repeat as needed. Printed: 3/16/15 Page 7 of 8 Revision # 1
TIMING DIAGRAM AND RF POWER CALCULATIONS Printed: 3/16/15 Page 8 of 8 Revision # 1