Form 9.B Project Summary



Proposal Number:


Project Title:

Auto-Alignment and Lag Angle

Compensation Technologies for

Autonomous Coherent Lidars

Technical Abstract (Limit 200 words)

Doppler Lidar is uniquely capable of meeting

NASA's EOS tropospheric wind sensing needs.

However, these autonomous coherent lidar systems

will potentially suffer significant SNR loss due to

component misalignment and lag angle effects.

Launch vibration and thermal loading induced

component misalignment is a serious concern which

can potentially be solved using clever

auto-alignment schemes. For a space based

transceiver, lag angles on the order of 100's of

beam widths result, even for moderate scan rates

(~7 RPM). To date, neither of these technologies

have been sufficiently developed to satisfy NASA's

EOS measurement needs. CTI also has a strong

interest in solving these technological problems for

its ground based autonomous lidar systems.

Auto-alignment technologies will result in

lower-cost sensors with greater autonomy. Lag

angle compensation will facilitate faster scan rates,

larger apertures, and greater volumetric coverage

capability. In the proposed Phase I effort CTI will

investigate designs exhibiting a high level of

synergism between NASA's and CTI's

requirements for the following three lidar

subsystems: 1) laser auto-alignment, 2) transceiver

auto-alignment, and 3) lag angle compensation. This

Phase I effort will leverage upon experience and

knowledge gained during a previous CTI R/R&D

program, which investigated transceiver

performance as a function of laser and transceiver


Potential Commercial Applications (Limit 200 words)

Potential commercial applications for these

lower-cost faster scan rate autonomous sensors

include, use of the sensor at airports for detection

of hazardous aircraft wake vortices and windshear,

increasing airport capacity, improved helicopter

operations onboard small to medium sized ships,

and airborne wind measurement systems for

improved ride quality and gust alleviation. In

addition, the auto-alignment concept will find many

commercial applications wherever two or more

beams need to be aligned to each other, such as is

required in non-linear optics, single-mode fiber

optic beam launching, etc.

Name and Address of Principal Investigator (Name,

Organization Name, Mail Address, City/State/Zip)

Dr. Philip Gatt

CoherentTechnologies Inc.

655 Aspen Ridge Drive

Lafayette , CO 80026

Name and Address of Offeror (Firm Name, Mail Address,


Robert M. Huffaker

Coherent Technologies Inc.

655 Aspen Ridge Drive

Lafayette , CO 80026