SR540  光学斩波器

SR540光学斩波器可以满足您所有的光学调制要，无论是单光束实验，还是双光束研究。它具有4位数字频率显示、前面板频率控制、模拟电压频率控制和与两个参考输出可选择的工作模式。两个斩波片分别是5/6孔径和25/30孔径，可实现光学调制从4Hz到3.7KHz。参考频率与实际斩波频率相一致，采用闭环控制系统，斩波输出更加稳定。

· 4 Hz to 3.7 kHz chopping frequencies   · Low phase jitter     · Single and dual beam experiments    · Sum & difference reference outputs    · Bolt clamp or rod mounting

斩波频率                  4 Hz to 400 Hz (5/6 slot blade)
                                  400 Hz to 3.7 kHz (25/30 slot blade)
频率稳定性              250 ppm/°C (typ.)
频率漂移                 <2 %, 100 Hz < f < 3700 Hz
相位抖动(rms)        0.2° (50 Hz to 400 Hz)
                                  0.5° (400 Hz to 3.7 kHz)
频率显示                  4-digit, 1 Hz resolution and accuracy
频率控制   10-turn pot with 3 ranges:
                                   4 Hz to 40 Hz
                                   40 Hz to 400 Hz
                                   400 Hz to 3.7 kHz
输入控制电压           0 to 10 VDC for 0 to 100 % of full scale(Control voltage overrides frequency dial)
参考模式                   ƒinner, ƒouter, 5 × ƒouter, ƒinner + ƒouter, ƒouter − ƒinner
尺寸                控制器: 7.7" × 1.8" × 5.1" (WHD)
                        斩波器头: 2.8" × 2.1" × 1.0" (WHD)
斩波片直径：            4.04" ± 0.002"
连接线长度                6 ft.
电源                            12 W, 100/120/220/240 VAC,50/60 Hz

单光束实验：单光束可通过斩波器外孔径来进行，参考输出用最右端BNC口与SR830锁相放大器相连。	双光束实验：可以同时利用斩波片的内外孔径进行斩波调制，并且可同时对锁相放大器进行参考输入。

 

 

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SR470&SR474光学快门系统

美国斯坦福公司最新推出两种光学快门控制系统：分别是SR470激光Shutter控制器和SR474四通道激光Shutter驱动器，这些激光快门系统能尽量降低振动。
其独特设计的Shutter可分别被这两种控制器来控制，SR470提供一个单时间信号到一个斩波器头；而SR474可以同时驱动四个斩波器头，并且可以进行外部时间控制。

SR470 Front Panel	SR474 Front Panel
	超低振动快门头     真正的机械激光束通断   大于10M圈寿命             微处理器控制时序   调制频率为直流到125Hz（任意占空比）   可与3mm孔径配合   GPIB,RS-232接口 和 网口

具体规格参数如下：
SR475 Laser Shutter 
 
Mechanical  
Shutter blade                                        BeCu alloy, black oxide finish 
Clear aperture                                      0.120 in. min. diameter 
Exposure rise/fall time                        <500 µs typ., 950 µs max. 
Insertion delay jitter                            10 µs rms typ. (measured at 10 Hz rep rate) 
Bearing                                                 Sapphire jewel bearing 
Blade position                                     Closed-loop PID controlled 
Opening/closing bounce                   None allowed 
Operating temperature                      0 °C to 35 °C 
Mounting                                               Any orientation 
General
Max. cable length                                3 m 
Weight                                                  1 lbs.     
Dimensions                                        2.25" × 1.60 " × 1.00" (WHL) 
Power                                                   4.5 VDC @ 250 mA, 12 VDC @ 1.25 A  

SR470 Controller  

Timing 
Resolution                                          100 µs (8-digit display) 
Accuracy                                              100 ppm 
Pre-exposure delay                           0 to 10,000 s 
Exposure time                                    4 ms to 10,000 s 
Post-exposure delay                         4 ms to 10,000 s 
Repetition rate                                    DC to 125 Hz (any duty cycle) 
Initial state                                           Normally open or closed (user defined) 
Shutter type                                         SR470 Series Laser Shutter 
Triggering 
Modes                                                   Internal, external TTL, external level, front panel, continuous 
Triggered burst                                   1 to 99,999,999 timing cycles 
System Fault and Alarms
Alarm types                                          Fault LED indicator, audible alarm, and rear-panel TTL output.      
                                                                System automatically detects shutter fault.  
Display 
Type                                                      7-segment LED, 8-digit 
Display blanking                                 Front panel LEDs can be disabled. 
General
Interfaces                                             GPIB, RS-232 and Ethernet. All instrument functions are controllable 
                                                                 over the interfaces. 
Shutter alignment                               Align button chops shutter at 1 Hz 
Save/recall                                           Nine sets of instrument settings can be saved and recalled. 
Auxiliary I/O ports                                Rear-panel Aux I/O 1 & Aux I/O 2. TTL level, multipurpose ports. 
Control input                                        Context sensitive TTL input. Triggers on falling edge. TTL-high 
                                                                 resets to Normal state. TTL-low sets to Normal- state. 
Sync out                                                Rear-panel TTL level output. 
Power                                                   40 W, 90 to 264 VAC, 47 to 63 Hz 
Dimensions                                        7.95" × 3.37" × 10.25" (WHL) 
Weight                                                  7 lbs. 
Warranty                                              One year parts and labor on defects in materials and workmanship 

SR474 Four-Channel Driver  

Operation
Shutter type                                         SR470 Series Laser Shutters 
Shutter state                                       Shutter state can be controlled manually from front panel or from 
                                                               externall TTL timing signals. 
Channel enable                                 Front panel Enable buttons enable or disable each channel. 
Global control                                     Sets or resets all channels to their "Noraml" states. 
Shutter alignment                              Front-panel Align buttons cause selected channels to change state at 
                                                               a 1 Hz rate for easy laser alignment. 
Triggering
Modes                                                  Front-panel Source button selects external TTL, manual or remote 
                                                               (computer interface) state control. 
Repetition rate                                    DC to 125 Hz (any duty cycle) 
System Fault and Alarms
Alarm types                                          Fault LED indicators, audible alarm,and rear-panel TTL output. 
                                                                System automatically detects shutter fault. 
General
Display blanking                                 Front -panel LEDs can be disabled. 
Interfaces                                             GPIB, RS-232, and Ethernet. All instrument functions are controllable 
                                                                over the interfaces. 
Auxiliary I/O port                                  Rear-panel Aux I/O, TTL level 
Shutter polarity                                    "Normally Open" and "Normally Closed" states for each channel are 
                                                                set on rear-panel DIP switch. 
Shutter connector type                       IEEE-1254
Power                                                   75 W, 90 to 264 VAC, 47 to 63 Hz 
Dimensions                                        7.95"× 3.37 " × 10.25 " (WHL)
Weight                                                  7 lbs.
Warranty                                              One year parts and labor on defects in materials and workmanship 
                                                                (SR475 is warranted for 90 days)