Single-diffraction-grating and grism pulse compressors

Chauhan, Vikrant; Bowlan, Pamela; Cohen, Jacob; Trebino, Rick

doi:10.1364/josab.27.000619

Cited by 46 publications

(17 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently it has been successfully involved in several ultra-broadband amplified systems [11,12]. Compensation for 10 m of optical fiber at 800 nm has been reported using a compact single-grism compressor [13]. Our group has also recently reported preliminary results about the use of a grism line for fiber delivery and pulse compression [14].…”

Section: Introductionmentioning

confidence: 99%

Ultrashort pulse fiber delivery with optimized dispersion control by reflection grisms at 800 nm

et al. 2012

View full text Add to dashboard Cite

We experimentally demonstrate a compact and efficient arrangement for fiber delivery of sub-30 fs energetic light pulses at 800 nm. Pulses coming from a broadband Ti:Sapphire oscillator are negatively prechirped by a grism-pair stretcher that allows for the control of second and third orders of dispersion. At the direct exit of a 2.7-m long large mode area (LMA) photonic crystal fiber 1-nJ pulses are temporally compressed to 29 fs producing close to 30 kW of peak power. The tunability of the device is studied. Comparison between LMA fibers and standard SMF fibers is also discussed. ©2012 Optical Society of America

show abstract

Section: Introductionmentioning

confidence: 99%

Ultrashort pulse fiber delivery with optimized dispersion control by reflection grisms at 800 nm

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The two-photon excitation laser source at 920 nm (1 MHz repetition rate, 2 W maximal average output power, < 100 fs pulse width) was generated by an optical parametric amplifier (Opera-F, Coherent Inc.) that was pumped by a fiber laser (Monaco 1035-40-40, Coherent Inc.). After dispersion compensation [21], the laser beam was expanded with a 2× beam expander (BE02M-B, Thorlabs). A cylindrical lens (LJ1267RM-B, Thorlabs) then one-dimensionally focused the beam into a nearly parallel mirror pair (reflectivity > 99.9% at 920 nm, fused silica substrate, 250 mm long and 20 mm wide) with a separation of 300 mm.…”

Section: Methodsmentioning

confidence: 99%

Kilohertz two-photon fluorescence microscopy imaging of neural activityin vivo

Liang

Chen

et al. 2019

Preprint

View full text Add to dashboard Cite

12Understanding information processing in the brain requires us to monitor neural activity 13 in vivo at high spatiotemporal resolution. Using an ultrafast two-photon fluorescence 14 microscope (2PFM) empowered by all-optical laser scanning, we imaged neural activity in 15 vivo at 1,000 frames per second and submicron spatial resolution. This ultrafast imaging 16 method enabled monitoring of electrical activity down to 300 µm below the brain surface 17 in head fixed awake mice. 18 The ability to monitor neural signaling at synaptic and cellular resolution in vivo holds the key to 19 dissecting the complex mechanisms of neural activity in intact brains of behaving animals. The 20 past decade has witnessed a proliferation of genetically encoded fluorescence indicators that 21 monitor diverse neural signaling events in vivo, including those sensing calcium transients, 22 neurotransmitter and neuromodulator release, and membrane voltage [1]. Most popular are the 23 calcium indicators (e.g., GCaMP6 [2]) and glutamate sensors (e.g., iGluSnFR [3]), with their 24 success partly attributable to their slow temporal dynamics (e.g., rise and decay times of 100 -25 1000's milliseconds for GCaMP6 and tens of milliseconds for iGluSnFR), which can be adequately 26 sampled with conventional 2PFM systems. Indeed, using point scanning and near-infrared 27 wavelength for fluorescence excitation, 2PFM can routinely image calcium activity hundreds of 28 microns deep in opaque brains with submicron spatial resolution [4-6].29Imaging faster events, however, is more challenging. Indicators reporting membrane 30 voltage, arguably the most direct and important measure of neural activity, have rise and decay 31 times measured in milliseconds. Too fast for the frame rate of conventional 2PFM to match, their 32 in vivo imaging demonstrations were mostly carried out by widefield fluorescence microscopy with 33 comparatively poor spatial resolution and limited to superficial depths of the brain [7, 8]. In other 34 words, the capability of state-of-the-art indicators has outstripped our ability to image them at 35 sufficiently high speed, especially at high spatial resolution and in large depths of scattering brains. 36The imaging speed of conventional 2PFM is limited by laser scanners, such as 37 galvanometric mirrors, to tens of frame per second (fps) [5, 6]. Its effective pixel dwell time 38 (typically microseconds) is much longer than the ultimate limit imposed by the fluorescence 39 lifetime (typically nanoseconds), below which substantial crosstalk of fluorescence from 40 neighboring pixels can occur [9]. By leveraging an all-optical, passive laser scanner based on a 41 concept termed free-space angular-chirp-enhanced delay (FACED) [10], here we demonstrated 42 2PFM at 1,000 fps, with the pixel dwell time flexibly configured to reach the fluorescence lifetime. 43 We applied it to ultrafast monitoring of calcium activity, glutamate release, and action potentials 44 Figure 1: Principles and resolution of a 2PFM with a FACED module. ...

show abstract

“…However, it is difficult to evaluate the overall effects when two or more misalignments exist simultaneously, especially when taking the mirror adjustment errors into consideration. By utilizing extremely accurately manufactured roof mirrors or corner cubes, single-grating based stretchers or compressors have been proposed, which are more compact and show significant simplification in their adjustment [24,25]. In practice, limited by the element size and the great difficulty in manufacturing, the roof mirrors and corner cubes usually consist of two or three separate mirrors, leading the single grating structure to still possess the similar adjustment errors with the dual-grating structure.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Spatial Chirp Induced by Misalignments in a Parallel Grating Pair Pulse Stretcher

et al. 2020

View full text Add to dashboard Cite

Spatial chirp induced by the misaligned gratings and mirrors in a parallel grating pair pulse stretcher can significantly affect the performance of the output pulses. Firstly, a detailed analysis about the spatial chirp of the stretched pulses caused by the misalignments has been carried out using the ray tracing simulation method. According to the simulation results, an adjustment procedure has been summarized to accurately calibrate these misalignments. The proposed method has been successfully applied in a home-made chirped pulse stretcher. By measuring the output pulse with an imaging spectrometer, the results show the stretched pulse has a good linear temporal chirp and little spatial chirp, which demonstrates the good adjustment of the stretcher.

show abstract

Single-diffraction-grating and grism pulse compressors

Cited by 46 publications

References 14 publications

Ultrashort pulse fiber delivery with optimized dispersion control by reflection grisms at 800 nm

Ultrashort pulse fiber delivery with optimized dispersion control by reflection grisms at 800 nm

Kilohertz two-photon fluorescence microscopy imaging of neural activityin vivo

Investigation of Spatial Chirp Induced by Misalignments in a Parallel Grating Pair Pulse Stretcher

Contact Info

Product

Resources

About