Surface

Surface-enhanced Raman scattering on optical material fabricated by femtosecond laser
Paper 7673-21 of Conference 7673
Date: Tuesday, 06 April 2010
Time: 10:00 AM – 10:20 AM

Author(s): Wenhui Wang, Haibin Huo, Nan Wu, Mengyan Shen, Charles Guthy, Xingwei Wang, Univ. of Massachusetts Lowell (United States)

Raman spectroscopy is a technology that can detect and distinguish materials based on the materials' Raman scattering. However, the signal produced using this technology is usually too small to be useful. The Raman spectrum signal can, however, be amplified by creating rough patches on the surface of a material. In this paper, a novel method to produce nanometer-sized features on optical materials such as glass, fused silica, and quartz substrate is presented. Using a femtosecond laser, the transparent materials are sputtered and redeposited producing structures with nano-features. Scanning electron microscope photos of nano-structures on quartz substrate and optical fiber show that features with size of less than 100 nm have been successfully fabricated. Raman signals show that the intensity of the signal generated by Raman scattering was greatly enhanced compared to substrates without nano-features.

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Del Mar Photonics Product brochures - Femtosecond products data sheets (zip file, 4.34 Mbytes) - Del Mar Photonics

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Pulse strecher/compressor
Avoca SPIDER system
Buccaneer femtosecond fiber lasers with SHG Second Harmonic Generator
Cannon Ultra-Broadband Light Source
Cortes Cr:Forsterite Regenerative Amplifier
Infrared cross-correlator CCIR-800
Cross-correlator Rincon
Femtosecond Autocorrelator IRA-3-10
Kirra Faraday Optical Isolators
Mavericks femtosecond Cr:Forsterite laser
OAFP optical attenuator
Pearls femtosecond fiber laser (Er-doped fiber, 1530-1565 nm)
Pismo pulse picker
Reef-M femtosecond scanning autocorrelator for microscopy
Reef-RTD scanning autocorrelator
Reef-SS single shot autocorrelator
Femtosecond Second Harmonic Generator
Spectrometer ASP-100M
Spectrometer ASP-150C
Spectrometer ASP-IR
Tamarack and Buccaneer femtosecond fiber lasers (Er-doped fiber, 1560+/- 10nm)
Teahupoo femtosecond Ti:Sapphire regenerative amplifier
Femtosecond third harmonic generator
Tourmaline femtosecond fiber laser (1054 nm)
Tourmaline TETA Yb femtosecond amplified laser system
Tourmaline Yb-SS femtosecond solid state laser system
Trestles CW Ti:Sapphire laser
Trestles femtosecond Ti:Sapphire laser
Trestles Finesse femtosecond lasers system integrated with DPSS pump laser
Wedge Ti:Sapphire multipass amplifier

Experimental tests of femtosecond pulse laser propagation in turbid water: a beautiful hypothesis shot down
Paper 7678-23 of Conference 7678
Date: Tuesday, 06 April 2010
Time: 11:30 AM – 12:00 PM

Author(s): Michael J. DeWeert, BAE Systems (United States)

Laser-induced breakdown spectroscopy of RDX and HMX with nanosecond, picosecond, and femtosecond pulses
Paper 7665-28 of Conference 7665
Date: Wednesday, 07 April 2010
Time: 1:20 PM – 1:40 PM

Author(s): Sreedhar Sunku, Venugopal R. Soma, Prem Kiran Paturi, Surya P. Tewari, Manoj K. Gundawar, Univ. of Hyderabad (India)

LIBS has a number of properties that makes it attractive for the detection of explosives including stand-off detection capability. Herein we present some of our results on the LIBS measurements of BKNO3, RDX, and HMX using ns, ps, and fs pulses. RDX and HMX were mixed with KBr and pellets were prepared. Ns pulses at 532 nm, ps/fs pulses at 800 nm were used for experiments. Several features were observed in the spectra, collected without gating and delay, exclusive for each pulse domain. The differences/similarities in the spectra and the details of their origin will be presented in detail.

Diode-pumped cryogenic Yb3+:YLF laser of 100-watt output power with high beam quality
Paper 7686-5 of Conference 7686
Date: Monday, 05 April 2010
Time: 9:30 AM – 9:50 AM

Author(s): Luis Zapata, Daniel Miller, Daniel J. Ripin, Tso Yee Fan, MIT Lincoln Lab. (United States)

On the path to an efficient femtosecond (fs) laser source for high-power applications we are developing a cryogenically cooled Yb3+:YLF laser. Early in our program, a simple 2-mirror power oscillator pumped by a 940-nm fiber-delivered diode array has demonstrated 96-watts average power at 1.0-µm wavelength with near-diffraction-limited output and 57% slope efficiency (relative to absorbed pump power). We will report on our progress including the incorporation of a 960-nm diode pump for optimized absorption, and the development of a master oscillator with fs-pulse format.

Q-Peak sources for advanced remote sensing
Paper 7686-3 of Conference 7686
Date: Monday, 05 April 2010
Time: 8:50 AM – 9:10 AM

Author(s): John H. Flint, Q-Peak, Inc. (United States)

We will describe several laser systems recently developed at Q-Peak for defense remote sensing applications. One is a 250-kHz, 900-ps, 5-W green laser developed specifically for long-range LADAR applications. It is passively Q-switched using a saturable Bragg reflector developed at MIT. Another is a diode-pumped Yb:doped femtosecond regenerative amplifier laser system for LIBS. The system utilizes CPA approach with novel chirped volume Bragg grating technology. A third system has two rapidly-tuned OPO's that are each frequency doubled to cover the 210-300 nm wavelength range. We also have several coherent and incoherent lidar transmitters under development at 1, 1.5, and 2 µm.

Black silicon enhanced photodetectors: a path to IR CMOS
Paper 7660-20 of Conference 7660
Date: Monday, 05 April 2010
Time: 4:10 PM – 4:30 PM

Author(s): Martin U. Pralle, James E. Carey, SiOnyx Inc. (United States)

SiOnyx has developed a next generation silicon based photodetector with spectral sensitivity from 350 to 1300 nm. By doping silicon with sulfur using femtosecond laser processing, we enhance the spectral sensitivity of silicon enabling high performance infrared detection on a CMOS compatible chip well beyond the bandgap cutoff of traditional silicon. These detectors exhibit enhanced QE, photoconductive gain, (with responsivities in excess of 100 A/W) and compelling low noise performance. Operating at mere 3V these devices rival avalanche photodiodes at much lower power and bias. When applied to imaging platforms, this detector will enhance visible light imaging and will enable silicon to become the next generation nightvision detector, outperforming incumbent technologies in nearly all nighttime light conditions.

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Monolithic InAs/InP quantum dot mode-locked lasers and their applications
Paper 7686-45 of Conference 7686
Date: Tuesday, 06 April 2010
Time: 6:00 PM

Author(s): Zhenguo Lu, Jiaren Liu, Philip J. Poole, Pedro Barrios, Daniel Poitras, Sylvain Raymond, Zhejing Jiao, National Research Council Canada (Canada)

We have demonstrated a passive InAs/InP quantum-dot (QD) mode-locked laser (MLL) around 1550 nm with femtosecond (fs) pulses and repetition rate from 10 GHz to 100 GHz. Average output power is larger than 100 mW. Lasing threshold current and external differential quantum efficiency are as low as 17 mA and up to 40 %. Its RF spectra with a 3-dB linewidth of less than 100 KHz indicated stable fs pulses with ultra-low timing jitter. So proposed QD MLLs offer a promising solution to high-bit-rate clock recovery modules, photonic analog-to-digital converters, and generation of microwave and terahertz signals.

Multi-heterodyne mixing of frequency stabilized combs for ultrafast coherent signal processing
Paper 7700-3 of Conference 7700
Date: Monday, 05 April 2010
Time: 9:30 AM – 9:50 AM

Author(s): Josue Davila-Rodriguez, Mehmetkan Akbulut, Charles G. Williams, Peter J. Delfyett, Jr., CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)

Fast and precise measurements of ultrafast optical waveforms are essential to the development of optical coherent signal processing. In this paper, multi-heterodyne mixing of stabilized optical frequency combs is presented as a simple technique for the measurement of ultrafast laser pulses and exotic arbitrary optical waveforms. This technique takes advantage of both the broadband nature of the frequency comb and the narrow line-width of the individual comb-lines to produce an array of radio-frequency beat-notes that share the characteristics of the optical spectrum. Measurements of comb characteristics across THz of bandwidth are enabled by this method, while maintaining the accuracy at the level of the individual comb-line width. Results show that both frequency modulation and amplitude modulation combs can be measured using this scheme.
Time domain parabolic pulse creation of ultrafast chirped pulse
Paper 7700-18 of Conference 7700
Date: Tuesday, 06 April 2010
Time: 10:40 AM – 11:00 AM

Author(s): Dat T. Nguyen, CREOL, The College of Optics and Photonics. Univ. of Central Florida (United States); Mohammad Umar Piracha, Dimitrios Mandridis, Peter J. Delfyett, Jr., CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States); Michael Greenberg, Michael Mielke, Timothy Booth, Raydiance, Inc. (United States)

Parabolic pulse generation in time domain was experimentally demonstrated. Near transform limited pulses with gaussian-shape optical spectrum generated by a Mode-Locked Laser (MLL) are dispersed using a Chirped Fiber Bragg Grating. The time profile of the dispersed pulses will match the optical spectrum of the laser, due to frequency-to-time mapping resulting from the linear chirp. A simple amplitude modulator is used, where the driving electrical signal is quasi-static and is calculated to incorporate the optical spectral shape, the modulator's nonlinear response and the desired parabolic pulse shape. Preliminary result of pulse shaping with MLL source is presented. Parabolic pulse generation using a CW laser source was also demonstrated.

STIRAP on sodium gas as a function of argon buffer gas pressure
Paper 7665-37 of Conference 7665
Date: Wednesday, 07 April 2010
Time: 4:50 PM – 5:10 PM

Author(s): Jeffrey B. Johnson, Susan D. Allen, James L. Hicks, Joey Burdin, Arkansas State Univ. (United States)

As a precursor to the detection of explosives, we demonstrate coherent multiphoton excitation via STIRAP on sodium vapor in an argon buffer gas as a function of argon pressure. Results indicate that STIRAP can be performed in a buffer gas at atmospheric pressure with a minimal reduction in STIRAP efficiency. The 15 ps long light pulses used for the pump and Stokes pulses were produced by two synchronously pumped OPO/OPAs tuned to the 3p (2P1/2) < 3s (2S1/2) transition for the pump pulse and the 5s (2S1/2) < 3p (2P1/2) for the Stokes pulse.

Product Data Sheets

Del Mar Photonics Product brochures - Femtosecond products data sheets (zip file, 4.34 Mbytes) - Del Mar Photonics

Send us a request for standard or custom ultrafast (femtosecond) product