(2017 Fall)

In this course, students will mathematically model DPSS laser systems and processes with an emphasis of application of models to real-world lasers. Beginning with a pass-by-pass model, several approaches will be taken to improve accuracy when applied to high-gain lasers including the treatment of laser amplifiers as multiple segments. The "gold standard" Rigrod model will be developed and introduced then adapted to handle real losses.

The effects of temperature on both diode and solid-state media will be investigated and application made to the design of DPSS systems (a convolution model being used to predict the effects of diode temperature drift on ultimate output power of the system). As well, thermalization of the LLL of quasi-three-level media will be investigated as re-absorption loss is considered (including such effects as Stark splitting of the LLL which occurs in most real solid-state media). Implications to laser design (e.g. end-pumping) will then be considered. Finally, other thermal effects such as phase-matching of SHGs will be examined and complete optimization of DPSS lasers will be considered.

Many models will use numerical methods and will utilize spreadsheets. The goal is application of theoretical models to real lasers and so a substantial lab component allows students can examine application of, and prove, various models developed in the course on a variety of lasers.

This course is offered as part of the Photonics Engineering Technology (3 year) Program at Niagara College.

Two midterm examinations, totalling 60%, as follows ...

A two-part test held in two separate lecture classes. The first part will involve a mathematical simulation of a laser processwhile the second part will cover theory in the first part of the course including the EDFL, use of dB units, the Rigrod approach (with application to real lasers), Minimum pump power calculations, and diode characteristics and parameters.

A two-part test held in two consecutive lecture classes. Covers quasi-three-level lasers, Stark splitting of levels, the convolution model for predicting the effect of pump wavelength drift, and models for optimizing temperature.

Labs and assignments combined for a total of 40%

Course policies follow the Standardized Policies and Procedures for CEE (dated January 2011). In summary:

- LATE assignments are worth ZERO. There is no "grace period" with a "per day" penalty. Late submissions (i.e. ANY not printed and ready when you enter the lab) receive a mark of zero. You will be DENIED access to the printer at the start of the lab - either the lab is ready to submit, or it is late and hence worth zero.
- Students are allowed only ONE single-day late submission without penalty. This is a once only one-day extension ... once used, any further late submission will receive an automatic zero.
- Students must pass the theory (testing) and practical (lab/assignment) portions of the course separately in order to receive a passing grade. If a failing grade is received in either portion, then the lower of the two marks (theory or practical) will become the final grade.
- In order to be considered for supplementary evaluation (SE) upon failure in this course, a mark of 50% minimum will be required in the practical (lab/assignment) portion of the course plus a mark of 45% minimum in the theory (testing) portion. A theory mark of 44% or less, or a lab mark of 49% or less, will result in failure with no SE option.
- Granting of an SE is not automatic - those qualifying for an SE must apply to the chair who will arrange for the SE (since staff must be assigned to deliver the SE). Attendance and lab performance will be considered.
- Devices capable of RF reception are specifically
__banned__during all examinations and tests. This includes cell phones (which are not permitted, whether turned on or not) as well as tablets and laptops. Scientific calculators must not have RF capability (i.e. the use of a cell phone, tablet, or laptop as a calculator is expressly forbidden even if the "wireless" function is switched off). Translational references and dictionaries must be in paper form, not on an electronic device.

Complete course policies can be found in the Teaching and Learning Plan (T&LP) document found on Blackboard.

__Laser Modeling: A Numerical Approach with Algebra and Calculus__ by Csele, 2014, CRC Press, ISBN 9781466582507

The text, and the models presented within it, will be used extensively in this course including the Pass-by-pass model (chapter 3), Rigrod approach (chapter 4), Quasi-three-level lasers and Stark splitting (chapter 5), and Convolution model (chapter 5).

- Standard Operating Procedures (SOPs) for lasers in Niagara College's high powered laser labs.
**Laser Gain**a review of concepts from the most important concept from last year. Password Protected PDF**Gain Saturation**a review of concepts from the second most important concept from last year. Password Protected PDF- Simulating Laser Power in-class notes on power buildup in the HeNe laser from class. Accompanies the example spreadsheet. Password protected PDF.
- Power Development Simulation A rudimentary (round-trip) Pass-by-Pass model simulating power growth in a HeNe laser. Password-protected XLS
- Rigrod Theory and Application in-class notes. Password protected PDF.
- Predicting Pump Threshold in-class notes expanding on
__Csele__5.10. Password protected PDF - Reabsorption In Solid State Lasers a discussion of thermalization of the LLL, including Stark splitting of LLLs. Password protected PDF
- Midterm Preview practice questions for the midterm
- Convolution applying the technique of convolution to predict the effects of diode wavelength drift on the output of a DPSS system. Password protected PDF
- Formula Sheet as supplied with the first test
- Midterm #2 Preview practice questions for the midterm

Week 1: (Review from PHTN1400)

Week 2:

Week 3:

Week 4:

Week 7:

Week 10:

Tests:

There are several labs and assignments in this course. Lab sessions are two-hours in length.

In line with departmental policies, **the lab/assignment portion of this course MUST be passed SEPARATELY from the theory portion in order to pass this course.** Late labs result in an immediate mark of **ZERO** with no exceptions and no excuses accepted (including the now infamous "my printer ran out of ink" and "my computer died"). Failure to submit a lab (and a late lab is considered failed and will receive a mark of zero) will result in the student being placed on course condition. Failure to submit a second lab results in immediate **EXPULSION** from the course.

Labs on week 3 and week 4 (Week starting 2017/09/18 and 2017/09/25) in V115

Labs on week 5 (Week starting 2017/10/02) in V115

Lab on week 6 (Week Starting 2017/10/09) in V115 for both groups (moved up due to possibility of a strike)

Lab on week starting 2017/12/04) in V115

Lab on week starting 2017/12/11) in V115

Lab on week xx (Week Starting 201x/xx/xx) in V115

__ For the Photonics Technician/Technology programs ...__
Program Coordinator Alexander McGlashan

Office: S106

Telephone (905) 735-2211 x.7513

E-Mail:

Office: V113E (Office hours are

Telephone: (905) 735-2211 x.7629

E-Mail:

URL: http://technology.niagarac.on.ca/staff/mcsele

This course is part of the TECHNOLOGY division

*Some images and text excerpted from Laser Modeling: A Numerical Approach with Algebra and Calculus by Csele, CRC Press, 2014, ISBN 9781466582507. Further reproduction in any form is prohibited without written approval from the publisher.*