This paper gives the annual report on the progress of developing a US National Standard. Effort in this past year has been on derivation of test details  and an initial test plan to validate the test. This initial test is a major lesson learned in the development of the ISO standard tests, namely it will allow for the experimental validation of key assumptions in the test procedure. Among these key assumptions to be validated are that the exposure sequence is properly described by a Poisson sequence and the role of spot size on counting rate accuracy. Our results and the impact of these results on the test procedure will be given. The next steps in the development of the standard will be discussed.
Successful commerce of science and technology requires standardization of measurement. Today more than ever, there is need for a new Optical Laser Damage standard to increase the efficiency of commerce in the optical industry. The current Laser Damage Standard, ISO 21254, is overly complicated for a general seller/buyer and can produce ambiguous results. To address the challenges to efficient commerce from ISO 21254, OEOSC Task Force 7 (TF7) is developing a new US laser damage standard. The new standard is based on a measurement theory approach and introduced and examined. The optical manufacturer (seller) directly benefits from an operationally effective means to determine acceptance criteria around the ability of categorizing optics that will meet customer’s requirements. OEOSC Task Group TF7 is seeking broad industry support to develop the most useful and robust standard possible. The new US Laser Damage Standard will benefit the optical manufacturing industry and customers alike that use optics susceptible to laser damage in their applications by providing a clear unambiguous pass or fail result. The paper will conclude with a discussion of the path forward in the development of the US laser damage standard.
In previous years, this committee reported on the need for a US National Laser damage standard, addressing the needs of domestic industry. In 2017, a process was reported that connected the measurement of the active defect density in a small area, a, with the likely density of such defects over a larger area, A. This was presented as the basis of a Type 1, go/no-go test. 2018’s achievement, is development of process starting from a user’s requirements and flowing into test parameters. This year’s report covers the resulting test procedure that implements the test process a useful workable standard.
In previous years, this committee reported on the need for a US National Laser damage standard, addressing the needs of domestic industry.  Last year, a process was reported that connected the measurement of the active defect density in a small area, a, with the likely density of such defects over a larger area, A. This was presented as the basis of a Type 1, go/no-go test. The main issue as reported last year is that the proper flow of a standard is to start with the required properties of the larger area and design a robust test. The process presented in 2017  is hard to implement in a way convenient for the non-expert user, which is nearly all. The main thrust of the work in 2018, is developing and evaluating options for implementing a useful workable standard.
 “Periodic Review of ISO 21254: US National Committee Proposal for Revision”, Jonathan W. Arenberg, Donna J. Howland, Christopher Wren Carr, Michael D. Thomas, John C. Bellum, Trey Robinson and Jason Yager, Presented at SPIE Laser Damage, Boulder CO, 2016
 "U.S. National Committee proposed revision to the ISO Laser Damage Standard”, Jonathan W. Arenberg, Donna Howland, Michael Thomas, Trey Turner, John Bellum, Ella Field, C. Wren Carr, Gary Shaffer, Matthew Brophy, Allen Krisiloff, Proc. SPIE 10447, Laser-Induced Damage in Optical Materials 2017, 104471E (21 November 2017)
This paper reports on the fundamental idea behind a US National Committee, The Optics and Electro-Optics Standards
Council (OEOSC) Task Force (TF) 7, proposal for a so-called Type 1 laser damage test procedure. A Type 1 test is
designed to give a simple binary, pass or fail, result. Such tests are intended for the transactional type of damage testing
typical of acceptance and quality control testing. As such is it intended for bulk of certification of optics for the ability
to survive a given fluence, useful for manufacturers of optics and their customers, the system builders. At the root of the proposed method is the probability that an optic of area A will have R or less damage occurrences with a user specified
probability P at test fluence Φ. This assessment is made by a survey of area and the observation of n events. The paper
presents the derivation of probability of N or less damage sites on A given n events observed in area a. The paper
concludes with the remaining steps to development of a useful test procedure based on the idea presented.
In this paper, we describe a red OPO device that is synchronously pumped by a mode-locked laser. The pump source is a diode pumped mode-locked Nd:YAG laser. The motivation for this approach is that the high peak power of the mode- locked pulses allows the use of shorter PPLN crystals that reduces the impact of refractive index perturbations. We expect that eh mode-locked implementation will not exhibit the power instabilities that limited the previous continuous-wave version, while the high repetition rate of the mode-locked format will be comparable to true cw in most applications.