PHTN1400: Principles Of Laser Systems
(2020 Winter)



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Course Description

The basic principles from PHTN1300 are applied in this practical course which examines the operating principles, procedures, maintenance, and applications of specific laser systems including, primarily, solid-state lasers (e.g. YAG and ruby). Power/pump sources, laser structure, cavity optics, basic laser processes, beam characteristics, and emission spectra for these lasers are examined. Specifics of wavelength selection (for multi-line lasers and those sharing energy levels between several transitions), pulse generation (including Q-switching, modelocking, and femtosecond pulse generation), and non-linear optics (harmonic generation and OPO) are included. Safety issues (e.g. laser classes and eyewear OD) are stressed throughout. A laboratory component allows students to investigate the operational principles of practical laser systems.

Prerequisites

Prerequisites for this course include PHTN1300 Principles of Light Sources and Lasers. This course is required for entry into PHTN1400.

This course is a prerequisite for PHTN1306 in the fall term. Failure to pass either the theory or lab/practical portion of this course will result in ineligibility to progress to this course in the fall term.

Evaluation ...

Three midterm examinations, valued at 20% each, as follows ...

Midterm #1 Ninety minutes, In Class, on Monday Feb 10, 2020
Midterm #2 Ninety minutes, On Blackboard on Monday, March 30, 2020
Midterm #3 Ninety minutes

Labs and assignments combined for a total of 40%

Course Policies ...

Course policies follow the Standardized Policies and Procedures for CEE (dated January 2011) and a complete set of rules pertinant to this course may be found in the T&LP on Blackboard. In summary:

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

Textbooks

There are two textbooks in this course. These same texts were used last term in PHTN1300 and will be used in the third year in PHTN1306 (i.e. you will not have to purchase another text for PHTN1306).

Fundamentals of Light Sources and Lasers by Csele, 2004, John Wiley & Sons, ISBN 0-471-47660-9

Chapters 5 to 14 are covered in this course.

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

Chapters 3, and 5 are covered in this course.

ERRATA: In Laser Modeling, in unity-gain equations (2.1), (2.6), and (2.8) the correct terms are egx not e-gx. Gain (g) is always a positive quantity, attenuation (γ) is negative.

Course Notes and Links

Laboratory Assignments

Students in 2020W will complete several laboratory assignments each one or two weeks in length. Lab sections are split into smaller groups (A and B) which perform different parts of the lab alternatively. During some weeks, all students will perform a different part of the same lab.

Read through each lab beforehand to determine the data you need to collect. Failure to collect required data will result in a penalty on the lab. If it becomes necessary to "borrow" data from another lab group, you MUST cite the source of the data or a zero will be assigned on the lab due to plagiarism.

NOTE: You will NOT be permitted into the lab and will be marked absent unless a mandatory safety quiz is successfully completed on Monday 2020/01/13 in the lecture.

Lab 0: Introduction

This lab will introduce students to the safety interlock system, safety procedures, and lab equipment in V115. In the lab we will review the correct choice of safety glasses (which students must do before each and every lab). Attendance at this lab is mandatory and failure to attend will result in an immediate penalty of 10%.

PRELAB: Viewing the safety video and successful completion of the SAFETY QUIZ in the lecture must be completed before entry to this lab or an immediate penalty of 10% will be applied to the lab mark and you will be DENIED ENTRANCE to any subsequent lab (labs #1 through #4) until the quiz is complete (and each lab will be marked as absent).

Successful completion of the Safety Quiz is required for ALL students BEFORE admission to this lab. NO EXCEPTIONS: NO SUCCESSFUL QUIZ, NO LAB ADMISSION (A penalty for being absent will then result, followed by course condition and finally EXPULSION ... we do NOT negotiate with safety!).

WARNING: Before the start of this lab, all students in this course are required to watch a safety video and successfully complete a quiz on laser safety (based on the video, and on lecture notes). This video can be found on the Coherent, Inc website (An older version can be found on YouTube but the one on the Coherent site is more up-to-date). The video covers a range of general laser safety topics.

Both lab groups will attend this lab on the week of 2020/01/15. Those who have failed to successfully pass the safety quiz in Monday's lecture are specifically barred from entering the lab.

Lab 1A: Safety

In this one-week lab, safety concepts and safe operating procedures of high-power lasers are examined including the concept of Nominal Hazard Zone (NHZ) and the required optical density (OD) of safety glasses. As a laboratory example, the safety of green laser pointers (with 'leakage' emissions at the pump wavelength of 808nm and lasing wavelength of 1064nm) will also be examined.

Lab Weighting: 1.0
Lab group A will perform the lab on Wednesday 2020/01/22
Lab group B will perform the lab on Wednesday 2020/01/29

PRELAB due on entry to the lab period where this lab will be performed (2020/01/22 for group A, 2020/01/29 for group B).

Successful completion of the Safety Quiz is required for ALL students BEFORE admission to this lab. NO EXCEPTIONS: NO SUCCESSFUL QUIZ, NO LAB ADMISSION (A penalty for being absent will then result, followed by course condition and finally EXPULSION ... we do NOT negotiate with safety!).

Lab report is DUE the following week after completion at the beginning of the lab period (for group A on or before Wednesday 2020/01/29, for group B on or before 2020/02/05)

Assignment 1B

An assignment covering homogeneous and inhomogeneous models, predicting output power, calculating spot size and cavity stability, and longitudinal modes.

Lab Weighting: 1.0

Lab report is DUE for group A on or before the beginning of the lab period on 2020/02/05 and for group B on or before the beginning of the lab period on 2020/01/29. As usual, this assignment must be typed.

Lab #2: DPSS Lasers


A complete overview of DPSS design concepts including the thermal and optical characteristics of pump diodes, optical absorption characteristics of vanadate (Nd:YVO4), and temperature sensitivity of harmonic generators (phase-matching).

Lab Weighting: 2.0
Lab group A will perform this lab on 2020/02/05
Lab group B will perform this lab on 2020/02/12

PRELAB due in the LECTURE on MONDAY, Feb 3rd for all groups (this will allow return in class before the first test as it is excellent practice)


Lab report is DUE at the beginning of the next lab period after the lab is performed. For group A on 2020/02/12 and for group B on 2020/02/19.


Lab #3: Q-Switched Lasers


The operation of AOM devices, EOM devices, and Q-Switching is investigated. An external AOM is aligned for Bragg diffraction, with the effective intra-cavity loss determined. In addition, an AOM Q-switch will be aligned on a real flashlamp-pumped Nd:YAG laser and the gain (and hence holdoff of the switch) determined.

Lab Weighting: 2.0
Lab group A will perform part A on 2020/03/04, part B on 2020/03/11
Lab group B will perform part B on 2020/03/04, part A on 2020/03/01

PRELAB due on entry to the first lab period (2020/03/04) for all groups

Lab report is DUE as single PDF file submitted via Blackboard on Wednesday 2020/03/25 at 12:00 noon sharp (with NO extensions and NO grace period ... the due date and time are enforced by Blackboard). See "Assignments" on the Blackboard site.


Lab #4A: Ultrafast (Modelocked) Femtosecond Lasers


Students will use a Tsunami femtosecond modelocked laser, aligning the laser for proper modelocking operation including the control of regenerative phase delay, dispersion control in the wavelength selector of the laser, and prevention of CW breakthrough during modelocked operation.

Lab Weighting: 1.0

Lab #4B: First Pulse Suppression


A survey of advanced Q-switching techniques is provided in this lab. The giant first pulse phenomenon is investigated along with the first pulse suppression (FPS) technique in which students will optimize the Q-Switch driver of a commercial DPSS laser.

Lab Weighting: 1.0

The lab schedule is subject to change based on availability of laboratory equipment

Contacts

For the Photonics Technician/Technology programs ...

For this specific course ...

Professor Mark Csele
Office: V13A (Office hours are POSTED on the Electroluminescent panel on the office door)
Telephone: (905) 735-2211 x.7629
E-Mail: (Be sure to include 'Lasers' in the subject line to avoid deletion by an anti-spam filter)

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

You are visitor # since Jan, 2005
Copyright (C) Professor M. Csele and Niagara College, Canada, 2005-2020
This course is part of the TECHNOLOGY division

Some images and text excerpted from Fundamentals of Light Sources and Lasers by Csele, John Wiley & Sons, 2004, ISBN 0-471-47660-9 and hence are Copyright John Wiley and Sons. 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 publishers.