Semi Active Laser Target Simulator: LTS-110

The seeker systems used in laser guided weapons must endure rigorous test and calibration to ensure proper functionality. Testing requires a semi-active laser target simulator (SAL-LTS) to be integrated into the test loop to validate the performance of the seeker system according to specifications. Laser guided weapon test and calibration is performed both in manufacturing and in the field before use.

The Photodigm Laser Target Simulator (LTS-110) is a laser source combining two wavelengths into a single fiber; these wavelengths are 660 nm and 1064 nm. The 1064 nm source is a pulsed source that can be triggered from an internal oscillator, or it can be triggered externally. The 1064 nm DBR laser source has internally selectable pulse widths of 20nm and 125 ns. The 1064 nm source can be attenuated by greater than 70 dB using integrated variable optical attenuators (VOAs) controlled through an analog input pint. The 660 nm visible source is provided as a means of aligning the output of the LTS-110.

Basic specifications are listed below. For more information, please read our detailed Application Note.

Basic Specifications for the LTS-110

Feature	Specification
Source Wavelength (only one on a time)	660 nm +/- 10 nm 1064 nm +/- 1 nm
Output Peak Power at 1064 nm	> 17 mW with no attenuation within a f/1.5 divergence
Output Power Visible	> 1 mW
Laser Biasing	Peak Current Setting
Laser Modulation	Triggered on the rising edge of TTL level input. Internal oscillator provided
Delay of Optical Pulse after Trigger	< 1 microsecond
Jitter of Optical Pulse with respect to Trigger	< 10 nanosecond
Optical Pulse Width	Selectable, 20 ns or 125 ns
Attenuation Control	0-6 V analog control, 0 dB to >60 dB. Response time <20 nsec. Repeatability >0.1 dB. Accuracy >0.3 dB
Unit Power On-Off	Switch, Safety Interlock Enable Required
Individual Laser Power On-Off	Toggle or TTL Level Control
Safety Interlocks	3 interlocks (2 for board function, 1 for IR laser only)
Power Input	120VAC, < 15A
Dimensions	19 inch rack mount width, 8 inch deep, 1.75 inch high

Photodigm LTS: An Air Force SBIR/STTR Success Story

Photodigm has received support from the SBIR program for the development of its family of high-power precision laser diodes to support multiple DoD programs. The LTS, delivered to the AFRL Munitions Directorate under an Air Force Phase II SBIR, showcased the unique high speed performance characteristic of these devices and provided Photodigm with valuable applications experience. Semi-active laser simulators of more advanced designs have also been delivered to multiple prime contractors.

Photodigm Laser Target Simulator

Versatile Semi-Active Laser Target Simulator

Photodigm LTS: An Air Force SBIR/STTR Success Story