External Cavity Tunable Diode Laser (399-1260 nm) | SIMTRUM Photonics Store

SIMTRUM's digital PID module features high speed, high precision, and a 2MHz open-loop bandwidth. It supports hold, scan, and reference waveform scan functions, providing five signal types: triangle wave, square wave, sawtooth wave, sine wave, and AWG.
*Hold Function: Maintains stability after signal disappearance, suitable for signal locking within sequences.
*Scan Function: Generates multiple scan waveforms, facilitating applications such as laser frequency locking.
*Reference Waveform Scan Function: Locks the signal to a preset waveform configured via the host computer.

Features Low Latency High Precision Easy Integration AWG Scanning Capability

Specifications

Product Number	LL-ECDL-PID
Voltage/Power Consumption	AC220V/10W
Closed-Loop Feedback Bandwidth	2000
Built-in DAC Resolution	16
Built-in ADC Sampling Rate	125
Long-Term Stability	Locked at VPP < 0.1%

 

Test Data

Hardware Delay Test Results: The PID hardware delay is 210 ns, comprising 98 ns for ADC delay, 103 ns for DAC delay, and 8 ns for internal FPGA signal synchronization. Beyond hardware delays, the PID computation delay is 56 ns, resulting in a total system delay of approximately 270 ns.

Open-loop Bandwidth Test: Set the network analyzer to S21 mode to measure the transfer function from PID signal input to output. The phase exhibits a discontinuity at 2.05 MHz.

Long-term Stability Test: With digital PID enabled, the laser power fluctuation VPP does not exceed 0.03% over a 20-minute period. However, under the same duration with digital PID disabled, power fluctuation VPP approaches 10% due to inherent laser characteristics and fiber coupling factors.

 

 

Scanning Fabry-Perot Interferometer

SIMTRUM's scanning Fabry-Pérot interferometer incorporates two high-reflectivity mirrors. By adjusting the mirror spacing via piezoelectric transducers, the cavity functions as an ultra-narrow bandpass filter. After measuring the free spectral range of the confocal cavity, the oscilloscope's time base can be calibrated to quantitatively measure laser linearity.

Features Adjustable Scanning Range High Reflectivity High Resolution Integrated Design

Specifications

Product Number	LL-ECDL-SFPI
Wavelength Range	535-820/825-1275/1275-2000 nm
Resolution	＜7.5 MHz
Free Spectral Range	1.5 GHz
Optical Cavity Length	50 mm
Cavity Finesse	＞200 (Typ. 250)
Dimensions	Φ50.8×85 mm

 

Test Data

Transmitted photodetector signal during 780 nm laser frequency sweeping

Fitting of Peak A yielded peak position and width of 0.059 and 0.147, respectively.

Fitting Peak B yields a peak position of 28.97 and a width of 0.134. Combined, these values indicate a fineness of approximately 205.8 at 1063 nm, with a resolution of 1500/205.8 ~ 7.3 MHz.