Specifications - Compact Scientific NdYAG tripled.docx
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- Solicitation number
- 80NSSC23845862Q
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This document outlines the specifications for a compact scientific pulsed Nd:YAG laser with output at the third harmonic wavelength that the National Aeronautics and Space Administration Shared Services Center is seeking to procure through special notice solicitation number 80NSSC23845862Q. The laser must have a repetition rate of 20 Hz, second and third harmonic generators for 532 nm and 355 nm wavelengths, a minimum output energy of 40 mJ per pulse at 355 nm, and meet other technical requirements including pulse width, linewidth, beam properties, energy stability, and dimensions. The successful offeror must be able to deliver the laser within fourteen weeks of receipt of order, along with performance data and user documentation.
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Specifications for a Compact Scientific Pulsed Nd:YAG- Laser with Output at the 3rd harmonic wavelength
BACKGROUND:
The NASA Glenn Research Center (GRC) has requirements for a 20-Hz, q-switched, Nd:YAG pulsed laser system capable of producing output wavelengths at the fundamental, 2nd, and 3rd 1064-nm, 532-nm, 355-nm. We will make use of the 355-nm output. The output of the system shall be linearly polarized. This system will be used for a variety of spectroscopic measurements in our combustion facility. Primarily, we will be using the laser for planar laser induced fluorescence (PLIF) of formaldehyde (CH2O). Additional measurements may include planar elastic scatter (PES), and spontaneous Raman spectroscopy of OH and fuel molecules, among others, which we access in the ultraviolet. PLIF and PES are image-based measurement tools in which we convert the laser beam into a thin sheet, typically 3-inches wide; this laser sheet is directed to the test section, which is located in another room, using mirrors. Therefore we require a laser system capable of generating high power in the ultraviolet. High power is needed to achieve good signal/noise within the images, and to handle necessary loss of energy as the beam is directed using as many as ten mirrors. The line width of the laser at these wavelengths must be narrow so as to provide good coupling of the laser to the particular molecule absorption line we wish to excite. Additionally, the laser will be used in two or more labs, and must be easily portable (i.e., small and light weight) and must be small enough to fit within our available space and be operational on our laser tables; the overall rectangular envelope cannot be larger than 30 inches long (laser beam exit along this length) by 8 inches wide, by 3 inches high. Included in the definition of portability is being able to operate using 110 VAC electrical service so that the laser can be plugged into a standard grounded outlet. Any additional electronics should be able to fit underneath the table, with a footprint within 18 inches by 10 inches and be no more than 20 inches high.
The following are the minimum salient characteristics of the compact Nd:YAG laser required for our combustion spectroscopy measurements. These salient characteristics are equivalent to the Litron Lasers, LG 200-20 third harmonic output at 355-nm wavelength. If proposing an equivalent laser, the Offeror must provide supporting documentation, in sufficient detail, for the Government to determine if the characteristics of the proposed laser meet all of the below salient characteristics.
SPECIFICATIONS:
Item 1: Litron Laser, Nano LG 200-20, with second and third harmonic generation shall:
1) Have a repetition rate of 20-Hz.
2) Have second and third harmonic generators for 532-nm and 355-nm.
3) Include a wavelength separator to allow passage of 355-nm output alone.
4) Include a visible pointing diode.
5) Have laser pulse widths, full-width-at-half-maximum no greater than 6 ns.
6) Have minimum output energy of 40 mJ per pulse at 355-nm.
7) Be linearly polarized.
8) Have maximum linewidth 4 pm at 355-nm.
9) Have divergence less than 0.5 mrad.
10) Have beam-pointing stability < 70-microrad over 99% of shots.
11) Have RMS jitter with respect to the q-switch of < 0.5 ns.
12) Have beam diameter of 5-mm.
13) Have shot-to-shot energy stability over 99% of pulses less than 2% rms.
14) Use self-sealing quick disconnects for the water supply.
15) Have an integrated cooling and electronics power supply unit to provide laser head cooling and laser pulse synchronization of flashlamp and q-switch vial TTL signals, RS-232, or remote. Dimensions should be no larger than 18 inches long by 10 inches wide by 20 inches high.
16) Have laser head dimensions no larger than 30 inches long by 8 inches wide by 3 inches high.
17) Operate using 110 VAC, single phase electrical service.
DELIVERY:
Delivery of the compact, 20-Hz pulsed laser shall be fourteen weeks after receipt of order (ARO).
Delivery to include a data summary of the specific build, with laser beam profiles, output energy and pulse width at each wavelength, q-switch delays, etc.
Delivery to include user manual(s).
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